Critical Care

A case of locally acquired dengue fever has been confirmed in a resident of Baldwin Park, California, according to a press release from the Los Angeles County Department of Public Health. This locally acquired case of dengue is the third to be reported in California and the first to be reported by the Los Angeles County Department of Public Health; cases were confirmed in Pasadena and Long Beach, California, in the fall of 2023.

“Dengue is the most common insect-borne viral infection in the world, with a wide geographic spread; we know that we have mosquitoes capable of carrying and transmitting the virus in the United States already, and Los Angeles county is a major epicenter for international travel and trade,” James Lawler, MD, associate director for International Programs and Innovation at the Global Center for Health Security and professor in the Infectious Diseases Division at the University of Nebraska Medical Center, Omaha, Nebraska, said in an interview.

Although the patient had no known history of travel to a dengue-endemic area, the potential risk for widespread transmission of the virus in the Los Angeles County area remains low, and no additional suspected cases of locally acquired dengue have been identified, according to the release. However, the recent cases highlight the need for vigilance on the part of the public to reduce transmission of mosquito-borne infections, the public health department noted.

Most cases of dengue occur in people who have traveled to areas where the disease is more common, mainly tropical and subtropical areas, according to the press release. However, the types of mosquitoes that spread dengue exist in parts of the United States, so locally acquired infections can occur.

The Centers for Disease Control and Prevention (CDC) issued an official health advisory in June 2024 about an increased risk for dengue infections in the United States. According to the advisory, 745 cases of dengue were identified in US travelers to endemic areas between January 1, 2024, and June 24, 2024.

The CDC advises clinicians to maintain a high level of suspicion for dengue among individuals with fever and recent travel to areas with frequent dengue transmission, but also to consider locally acquired disease in areas of mosquito vectors.

In clinical practice, dengue may be difficult to differentiate from other febrile systemic infections, Dr. Lawler noted. “Joint pain, low back pain, and headache (often retro-orbital) are common and can be severe, and a rash often appears several days into illness,” he noted.

Do not delay treatment in suspected cases while waiting for test results, the CDC emphasized in the advisory. Food and Drug Administration–approved tests for dengue include RT-PCR and IgM antibody tests or NS1 and IgM antibody tests.

“Severe dengue can be life-threatening and progress to a hemorrhagic fever-like syndrome, and patients with severe dengue should be cared for on a high-acuity or intensive care setting, with close monitoring of labs and fluid status,” Dr. Lawler told this news organization.

The World Health Organization has published guidelines for the management of dengue, which Dr. Lawler strongly recommends to clinicians in the rare event that they are facing a severe case. The treatment for dengue is supportive care, according to the CDC; a vaccine that was deemed safe and effective is no longer being manufactured because of low demand.

Most symptoms last for 2-7 days, and most patients recover within a week, but approximately 1 in 20 may develop severe disease, according to the Los Angeles County Department of Public Health.

Approximately one quarter of dengue infections are symptomatic, and clinicians should know the signs of progression to severe disease, which include abdominal pain or tenderness, persistent vomiting, clinical fluid accumulation, mucosal bleeding, lethargy or restlessness, and liver enlargement, according to the CDC.
 

Local Dengue Not Unexpected

“Sadly, I am not surprised at another locally acquired case of dengue fever in the United States,” said Dr. Lawler. “We also have seen a trend of more historically tropical, insect-borne diseases popping up with locally acquired cases in the United States,” he noted.

Dr. Lawler suggested that “the erosion of state and local public health” is a major contributor to the increase in dengue cases. For more than 100 years, activities of state and local public health officials had significantly curtailed mosquito-borne diseases through aggressive control programs, “but we seem to be losing ground over the last several years,” he said.

“Locally acquired dengue cases are still rare in the United States,” he added. “However, people can protect themselves against dengue and more common arthropod-borne infections by taking precautions to cover up and wear insect repellent while outdoors.”

In addition, the Los Angeles County Department of Public Health emphasized in its press release that local residents reduce their risk for contact with mosquitoes by removing areas of standing water on their property and ensuring well-fitted screens on doors and windows.

Dr. Lawler had no financial conflicts to disclose.
 

A version of this article first appeared on Medscape.com.

A case of locally acquired dengue fever has been confirmed in a resident of Baldwin Park, California, according to a press release from the Los Angeles County Department of Public Health. This locally acquired case of dengue is the third to be reported in California and the first to be reported by the Los Angeles County Department of Public Health; cases were confirmed in Pasadena and Long Beach, California, in the fall of 2023.

“Dengue is the most common insect-borne viral infection in the world, with a wide geographic spread; we know that we have mosquitoes capable of carrying and transmitting the virus in the United States already, and Los Angeles county is a major epicenter for international travel and trade,” James Lawler, MD, associate director for International Programs and Innovation at the Global Center for Health Security and professor in the Infectious Diseases Division at the University of Nebraska Medical Center, Omaha, Nebraska, said in an interview.

Although the patient had no known history of travel to a dengue-endemic area, the potential risk for widespread transmission of the virus in the Los Angeles County area remains low, and no additional suspected cases of locally acquired dengue have been identified, according to the release. However, the recent cases highlight the need for vigilance on the part of the public to reduce transmission of mosquito-borne infections, the public health department noted.

Most cases of dengue occur in people who have traveled to areas where the disease is more common, mainly tropical and subtropical areas, according to the press release. However, the types of mosquitoes that spread dengue exist in parts of the United States, so locally acquired infections can occur.

The Centers for Disease Control and Prevention (CDC) issued an official health advisory in June 2024 about an increased risk for dengue infections in the United States. According to the advisory, 745 cases of dengue were identified in US travelers to endemic areas between January 1, 2024, and June 24, 2024.

The CDC advises clinicians to maintain a high level of suspicion for dengue among individuals with fever and recent travel to areas with frequent dengue transmission, but also to consider locally acquired disease in areas of mosquito vectors.

In clinical practice, dengue may be difficult to differentiate from other febrile systemic infections, Dr. Lawler noted. “Joint pain, low back pain, and headache (often retro-orbital) are common and can be severe, and a rash often appears several days into illness,” he noted.

Do not delay treatment in suspected cases while waiting for test results, the CDC emphasized in the advisory. Food and Drug Administration–approved tests for dengue include RT-PCR and IgM antibody tests or NS1 and IgM antibody tests.

“Severe dengue can be life-threatening and progress to a hemorrhagic fever-like syndrome, and patients with severe dengue should be cared for on a high-acuity or intensive care setting, with close monitoring of labs and fluid status,” Dr. Lawler told this news organization.

The World Health Organization has published guidelines for the management of dengue, which Dr. Lawler strongly recommends to clinicians in the rare event that they are facing a severe case. The treatment for dengue is supportive care, according to the CDC; a vaccine that was deemed safe and effective is no longer being manufactured because of low demand.

Most symptoms last for 2-7 days, and most patients recover within a week, but approximately 1 in 20 may develop severe disease, according to the Los Angeles County Department of Public Health.

Approximately one quarter of dengue infections are symptomatic, and clinicians should know the signs of progression to severe disease, which include abdominal pain or tenderness, persistent vomiting, clinical fluid accumulation, mucosal bleeding, lethargy or restlessness, and liver enlargement, according to the CDC.
 

Local Dengue Not Unexpected

“Sadly, I am not surprised at another locally acquired case of dengue fever in the United States,” said Dr. Lawler. “We also have seen a trend of more historically tropical, insect-borne diseases popping up with locally acquired cases in the United States,” he noted.

Dr. Lawler suggested that “the erosion of state and local public health” is a major contributor to the increase in dengue cases. For more than 100 years, activities of state and local public health officials had significantly curtailed mosquito-borne diseases through aggressive control programs, “but we seem to be losing ground over the last several years,” he said.

“Locally acquired dengue cases are still rare in the United States,” he added. “However, people can protect themselves against dengue and more common arthropod-borne infections by taking precautions to cover up and wear insect repellent while outdoors.”

In addition, the Los Angeles County Department of Public Health emphasized in its press release that local residents reduce their risk for contact with mosquitoes by removing areas of standing water on their property and ensuring well-fitted screens on doors and windows.

Dr. Lawler had no financial conflicts to disclose.
 

A version of this article first appeared on Medscape.com.

A case of locally acquired dengue fever has been confirmed in a resident of Baldwin Park, California, according to a press release from the Los Angeles County Department of Public Health. This locally acquired case of dengue is the third to be reported in California and the first to be reported by the Los Angeles County Department of Public Health; cases were confirmed in Pasadena and Long Beach, California, in the fall of 2023.

“Dengue is the most common insect-borne viral infection in the world, with a wide geographic spread; we know that we have mosquitoes capable of carrying and transmitting the virus in the United States already, and Los Angeles county is a major epicenter for international travel and trade,” James Lawler, MD, associate director for International Programs and Innovation at the Global Center for Health Security and professor in the Infectious Diseases Division at the University of Nebraska Medical Center, Omaha, Nebraska, said in an interview.

Although the patient had no known history of travel to a dengue-endemic area, the potential risk for widespread transmission of the virus in the Los Angeles County area remains low, and no additional suspected cases of locally acquired dengue have been identified, according to the release. However, the recent cases highlight the need for vigilance on the part of the public to reduce transmission of mosquito-borne infections, the public health department noted.

Most cases of dengue occur in people who have traveled to areas where the disease is more common, mainly tropical and subtropical areas, according to the press release. However, the types of mosquitoes that spread dengue exist in parts of the United States, so locally acquired infections can occur.

The Centers for Disease Control and Prevention (CDC) issued an official health advisory in June 2024 about an increased risk for dengue infections in the United States. According to the advisory, 745 cases of dengue were identified in US travelers to endemic areas between January 1, 2024, and June 24, 2024.

The CDC advises clinicians to maintain a high level of suspicion for dengue among individuals with fever and recent travel to areas with frequent dengue transmission, but also to consider locally acquired disease in areas of mosquito vectors.

In clinical practice, dengue may be difficult to differentiate from other febrile systemic infections, Dr. Lawler noted. “Joint pain, low back pain, and headache (often retro-orbital) are common and can be severe, and a rash often appears several days into illness,” he noted.

Do not delay treatment in suspected cases while waiting for test results, the CDC emphasized in the advisory. Food and Drug Administration–approved tests for dengue include RT-PCR and IgM antibody tests or NS1 and IgM antibody tests.

“Severe dengue can be life-threatening and progress to a hemorrhagic fever-like syndrome, and patients with severe dengue should be cared for on a high-acuity or intensive care setting, with close monitoring of labs and fluid status,” Dr. Lawler told this news organization.

The World Health Organization has published guidelines for the management of dengue, which Dr. Lawler strongly recommends to clinicians in the rare event that they are facing a severe case. The treatment for dengue is supportive care, according to the CDC; a vaccine that was deemed safe and effective is no longer being manufactured because of low demand.

Most symptoms last for 2-7 days, and most patients recover within a week, but approximately 1 in 20 may develop severe disease, according to the Los Angeles County Department of Public Health.

Approximately one quarter of dengue infections are symptomatic, and clinicians should know the signs of progression to severe disease, which include abdominal pain or tenderness, persistent vomiting, clinical fluid accumulation, mucosal bleeding, lethargy or restlessness, and liver enlargement, according to the CDC.
 

Local Dengue Not Unexpected

“Sadly, I am not surprised at another locally acquired case of dengue fever in the United States,” said Dr. Lawler. “We also have seen a trend of more historically tropical, insect-borne diseases popping up with locally acquired cases in the United States,” he noted.

Dr. Lawler suggested that “the erosion of state and local public health” is a major contributor to the increase in dengue cases. For more than 100 years, activities of state and local public health officials had significantly curtailed mosquito-borne diseases through aggressive control programs, “but we seem to be losing ground over the last several years,” he said.

“Locally acquired dengue cases are still rare in the United States,” he added. “However, people can protect themselves against dengue and more common arthropod-borne infections by taking precautions to cover up and wear insect repellent while outdoors.”

In addition, the Los Angeles County Department of Public Health emphasized in its press release that local residents reduce their risk for contact with mosquitoes by removing areas of standing water on their property and ensuring well-fitted screens on doors and windows.

Dr. Lawler had no financial conflicts to disclose.
 

A version of this article first appeared on Medscape.com.

VIENNA — The optimal course of treatment when managing acute, high-risk pulmonary embolism (PE) remains a contentious topic among respiratory specialists.

Systemic thrombolysis, specifically using recombinant tissue plasminogen activator (rtPA), is the current gold standard treatment for high-risk PE. However, the real-world application is less straightforward due to patient complexities. Some clinicians believe that advances in mechanical and surgical techniques have made rtPA a thing of the past. Others think there is still insufficient evidence to support alternatives as the standard of care.

Here at the European Respiratory Society (ERS) 2024 Congress, respiratory specialists presented contrasting viewpoints and the latest evidence on each side of the issue to provide a comprehensive framework for navigating the complex decision-making process required for effective treatment.

“High-risk PE is a mechanical problem and thus needs a mechanical solution,” said Parth M. Rali, MD, an associate professor in thoracic medicine and surgery at the Lewis Katz School of Medicine at Temple University, Philadelphia.

“The marketing on some of the mechanical techniques is very impressive,” said Olivier Sanchez, MD, a pulmonologist in the Department of Pneumology and Intensive Care at the Georges Pompidou European Hospital in France. “But what is the evidence of such treatment in the setting of pulmonary embolism?”
 

The Case Against rtPA as the Standard of Care

High-risk PE typically involves hemodynamically unstable patients presenting with conditions such as low blood pressure, cardiac arrest, or the need for mechanical circulatory support. There is a spectrum of severity within high-risk PE, making it a complex condition to manage, especially since many patients have comorbidities like anemia or active cancer, complicating treatment. “It’s a very dynamic and fluid condition, and we can’t take for granted that rtPA is a standard of care,” Dr. Rali said.

Alternative treatments such as catheter-directed therapies, extracorporeal membrane oxygenation (ECMO), and surgical embolectomy are emerging as promising options, especially for patients who do not respond to or cannot receive rtPA. Mechanical treatments offer benefits in reducing clot burden and stabilizing patients, but they come with their own challenges.

ECMO can stabilize patients who are in shock or cardiac arrest, buying time for the clot to resolve or for further interventions like surgery or catheter-based treatments, said Dr. Rali. However, it is an invasive procedure requiring cannulation of large blood vessels, often involving significant resources and expertise.

Catheter-directed thrombolysis is a minimally invasive technique where a catheter is inserted directly into the pulmonary artery to deliver thrombolytic drugs at lower doses. This method allows for more targeted treatment of the clot, reducing the risk for systemic bleeding that comes with higher doses of thrombolytic agents used in systemic therapy, Dr. Rali explained. 

Dr. Rali reported results from the FLAME study, which investigated the effectiveness of FlowTriever mechanical thrombectomy compared with conventional therapies for high-risk PE. This prospective, multicenter observational study enrolled 53 patients in the FlowTriever arm and 61 in the context arm, which included patients treated with systemic thrombolysis or anticoagulation. The primary endpoint, a composite of adverse in-hospital outcomes, was reached in 17% of FlowTriever patients, significantly lower than the 32% performance goal and the 63.9% rate in the context arm. In-hospital mortality was dramatically lower in the FlowTriever arm (1.9%) compared to the context arm (29.5%). 

When catheter-based treatment fails, surgical pulmonary embolectomy is a last-resort option. “Only a minority of the high-risk PE [patients] would qualify for rtPA without harmful side effects,” Dr. Rali concluded. “So think wise before you pull your trigger.” 
 

rtPA Not a Matter of the Past

In high-risk PE, the therapeutic priority is rapid hemodynamic stabilization and restoration of pulmonary blood flow to prevent cardiovascular collapse. Systemic thrombolysis acts quickly, reducing pulmonary vascular resistance and obstruction within hours, said Dr. Sanchez. 

Presenting at the ERS Congress, he reported numerous studies, including 15 randomized controlled trials that demonstrated its effectiveness in high-risk PE. The PEITHO trial, in particular, demonstrated the ability of systemic thrombolysis to reduce all-cause mortality and hemodynamic collapse within 7 days. 

However, this benefit comes at the cost of increased bleeding risk, including a 10% rate of major bleeding and a 2% risk for intracranial hemorrhage. “These data come from old studies using invasive diagnostic procedures, and with current diagnostic procedures, the rate of bleeding is probably lower,” Dr. Sanchez said. The risk of bleeding is also related to the type of thrombolytic agent, with tenecteplase being strongly associated with a higher risk of bleeding, while alteplase shows no increase in the risk of major bleeding, he added. New strategies like reduced-dose thrombolysis offer comparable efficacy and improved safety, as demonstrated in ongoing trials like  PEITHO-3, which aim to optimize the balance between efficacy and bleeding risk. Dr. Sanchez is the lead investigator of the PEITHO-3 study.

While rtPA might not be optimal for all patients, Dr. Sanchez thinks there is not enough evidence to replace it as a first-line treatment.

Existing studies on catheter-directed therapies often focus on surrogate endpoints, such as right-to-left ventricular ratio changes, rather than clinical outcomes like mortality, he said. Retrospective data suggest that catheter-directed therapies may reduce in-hospital mortality compared with systemic therapies, but they also increase the risk of intracranial bleeding, post-procedure complications, and device-related events.

Sanchez mentioned the same FLAME study described by Dr. Rali, which reported a 23% rate of device-related complications and 11% major bleeding in patients treated with catheter-directed therapies. 

“Systemic thrombolysis remains the first treatment of choice,” Dr. Sanchez concluded. “The use of catheter-directed treatment should be discussed as an alternative in case of contraindications.”
 

The Debate Continues

Numerous ongoing clinical studies, such as the FLARE trial, will address gaps in evidence and refine treatment protocols, potentially reshaping the standard of care in high-risk PE in the near future by providing new data on the efficacy and safety of existing and emerging therapies.

“The coming data will make it clearer what the best option is,” said Thamer Al Khouzaie, MD, a pulmonary medicine consultant at Johns Hopkins Aramco Healthcare in Dhahran, Saudi Arabia. For now, he said, systemic thrombolysis remains the best option for most patients because it is widely available, easily administered with intravenous infusion, and at a limited cost. Catheter-directed treatment and surgical options are only available in specialized centers, require expertise and training, and are also very expensive.

Dr. Rali, Dr. Sanchez, and Dr. Khouzaie report no relevant financial relationships.
 

A version of this article appeared on Medscape.com.

VIENNA — The optimal course of treatment when managing acute, high-risk pulmonary embolism (PE) remains a contentious topic among respiratory specialists.

Systemic thrombolysis, specifically using recombinant tissue plasminogen activator (rtPA), is the current gold standard treatment for high-risk PE. However, the real-world application is less straightforward due to patient complexities. Some clinicians believe that advances in mechanical and surgical techniques have made rtPA a thing of the past. Others think there is still insufficient evidence to support alternatives as the standard of care.

Here at the European Respiratory Society (ERS) 2024 Congress, respiratory specialists presented contrasting viewpoints and the latest evidence on each side of the issue to provide a comprehensive framework for navigating the complex decision-making process required for effective treatment.

“High-risk PE is a mechanical problem and thus needs a mechanical solution,” said Parth M. Rali, MD, an associate professor in thoracic medicine and surgery at the Lewis Katz School of Medicine at Temple University, Philadelphia.

“The marketing on some of the mechanical techniques is very impressive,” said Olivier Sanchez, MD, a pulmonologist in the Department of Pneumology and Intensive Care at the Georges Pompidou European Hospital in France. “But what is the evidence of such treatment in the setting of pulmonary embolism?”
 

The Case Against rtPA as the Standard of Care

High-risk PE typically involves hemodynamically unstable patients presenting with conditions such as low blood pressure, cardiac arrest, or the need for mechanical circulatory support. There is a spectrum of severity within high-risk PE, making it a complex condition to manage, especially since many patients have comorbidities like anemia or active cancer, complicating treatment. “It’s a very dynamic and fluid condition, and we can’t take for granted that rtPA is a standard of care,” Dr. Rali said.

Alternative treatments such as catheter-directed therapies, extracorporeal membrane oxygenation (ECMO), and surgical embolectomy are emerging as promising options, especially for patients who do not respond to or cannot receive rtPA. Mechanical treatments offer benefits in reducing clot burden and stabilizing patients, but they come with their own challenges.

ECMO can stabilize patients who are in shock or cardiac arrest, buying time for the clot to resolve or for further interventions like surgery or catheter-based treatments, said Dr. Rali. However, it is an invasive procedure requiring cannulation of large blood vessels, often involving significant resources and expertise.

Catheter-directed thrombolysis is a minimally invasive technique where a catheter is inserted directly into the pulmonary artery to deliver thrombolytic drugs at lower doses. This method allows for more targeted treatment of the clot, reducing the risk for systemic bleeding that comes with higher doses of thrombolytic agents used in systemic therapy, Dr. Rali explained. 

Dr. Rali reported results from the FLAME study, which investigated the effectiveness of FlowTriever mechanical thrombectomy compared with conventional therapies for high-risk PE. This prospective, multicenter observational study enrolled 53 patients in the FlowTriever arm and 61 in the context arm, which included patients treated with systemic thrombolysis or anticoagulation. The primary endpoint, a composite of adverse in-hospital outcomes, was reached in 17% of FlowTriever patients, significantly lower than the 32% performance goal and the 63.9% rate in the context arm. In-hospital mortality was dramatically lower in the FlowTriever arm (1.9%) compared to the context arm (29.5%). 

When catheter-based treatment fails, surgical pulmonary embolectomy is a last-resort option. “Only a minority of the high-risk PE [patients] would qualify for rtPA without harmful side effects,” Dr. Rali concluded. “So think wise before you pull your trigger.” 
 

rtPA Not a Matter of the Past

In high-risk PE, the therapeutic priority is rapid hemodynamic stabilization and restoration of pulmonary blood flow to prevent cardiovascular collapse. Systemic thrombolysis acts quickly, reducing pulmonary vascular resistance and obstruction within hours, said Dr. Sanchez. 

Presenting at the ERS Congress, he reported numerous studies, including 15 randomized controlled trials that demonstrated its effectiveness in high-risk PE. The PEITHO trial, in particular, demonstrated the ability of systemic thrombolysis to reduce all-cause mortality and hemodynamic collapse within 7 days. 

However, this benefit comes at the cost of increased bleeding risk, including a 10% rate of major bleeding and a 2% risk for intracranial hemorrhage. “These data come from old studies using invasive diagnostic procedures, and with current diagnostic procedures, the rate of bleeding is probably lower,” Dr. Sanchez said. The risk of bleeding is also related to the type of thrombolytic agent, with tenecteplase being strongly associated with a higher risk of bleeding, while alteplase shows no increase in the risk of major bleeding, he added. New strategies like reduced-dose thrombolysis offer comparable efficacy and improved safety, as demonstrated in ongoing trials like  PEITHO-3, which aim to optimize the balance between efficacy and bleeding risk. Dr. Sanchez is the lead investigator of the PEITHO-3 study.

While rtPA might not be optimal for all patients, Dr. Sanchez thinks there is not enough evidence to replace it as a first-line treatment.

Existing studies on catheter-directed therapies often focus on surrogate endpoints, such as right-to-left ventricular ratio changes, rather than clinical outcomes like mortality, he said. Retrospective data suggest that catheter-directed therapies may reduce in-hospital mortality compared with systemic therapies, but they also increase the risk of intracranial bleeding, post-procedure complications, and device-related events.

Sanchez mentioned the same FLAME study described by Dr. Rali, which reported a 23% rate of device-related complications and 11% major bleeding in patients treated with catheter-directed therapies. 

“Systemic thrombolysis remains the first treatment of choice,” Dr. Sanchez concluded. “The use of catheter-directed treatment should be discussed as an alternative in case of contraindications.”
 

The Debate Continues

Numerous ongoing clinical studies, such as the FLARE trial, will address gaps in evidence and refine treatment protocols, potentially reshaping the standard of care in high-risk PE in the near future by providing new data on the efficacy and safety of existing and emerging therapies.

“The coming data will make it clearer what the best option is,” said Thamer Al Khouzaie, MD, a pulmonary medicine consultant at Johns Hopkins Aramco Healthcare in Dhahran, Saudi Arabia. For now, he said, systemic thrombolysis remains the best option for most patients because it is widely available, easily administered with intravenous infusion, and at a limited cost. Catheter-directed treatment and surgical options are only available in specialized centers, require expertise and training, and are also very expensive.

Dr. Rali, Dr. Sanchez, and Dr. Khouzaie report no relevant financial relationships.
 

A version of this article appeared on Medscape.com.

VIENNA — The optimal course of treatment when managing acute, high-risk pulmonary embolism (PE) remains a contentious topic among respiratory specialists.

Systemic thrombolysis, specifically using recombinant tissue plasminogen activator (rtPA), is the current gold standard treatment for high-risk PE. However, the real-world application is less straightforward due to patient complexities. Some clinicians believe that advances in mechanical and surgical techniques have made rtPA a thing of the past. Others think there is still insufficient evidence to support alternatives as the standard of care.

Here at the European Respiratory Society (ERS) 2024 Congress, respiratory specialists presented contrasting viewpoints and the latest evidence on each side of the issue to provide a comprehensive framework for navigating the complex decision-making process required for effective treatment.

“High-risk PE is a mechanical problem and thus needs a mechanical solution,” said Parth M. Rali, MD, an associate professor in thoracic medicine and surgery at the Lewis Katz School of Medicine at Temple University, Philadelphia.

“The marketing on some of the mechanical techniques is very impressive,” said Olivier Sanchez, MD, a pulmonologist in the Department of Pneumology and Intensive Care at the Georges Pompidou European Hospital in France. “But what is the evidence of such treatment in the setting of pulmonary embolism?”
 

The Case Against rtPA as the Standard of Care

High-risk PE typically involves hemodynamically unstable patients presenting with conditions such as low blood pressure, cardiac arrest, or the need for mechanical circulatory support. There is a spectrum of severity within high-risk PE, making it a complex condition to manage, especially since many patients have comorbidities like anemia or active cancer, complicating treatment. “It’s a very dynamic and fluid condition, and we can’t take for granted that rtPA is a standard of care,” Dr. Rali said.

Alternative treatments such as catheter-directed therapies, extracorporeal membrane oxygenation (ECMO), and surgical embolectomy are emerging as promising options, especially for patients who do not respond to or cannot receive rtPA. Mechanical treatments offer benefits in reducing clot burden and stabilizing patients, but they come with their own challenges.

ECMO can stabilize patients who are in shock or cardiac arrest, buying time for the clot to resolve or for further interventions like surgery or catheter-based treatments, said Dr. Rali. However, it is an invasive procedure requiring cannulation of large blood vessels, often involving significant resources and expertise.

Catheter-directed thrombolysis is a minimally invasive technique where a catheter is inserted directly into the pulmonary artery to deliver thrombolytic drugs at lower doses. This method allows for more targeted treatment of the clot, reducing the risk for systemic bleeding that comes with higher doses of thrombolytic agents used in systemic therapy, Dr. Rali explained. 

Dr. Rali reported results from the FLAME study, which investigated the effectiveness of FlowTriever mechanical thrombectomy compared with conventional therapies for high-risk PE. This prospective, multicenter observational study enrolled 53 patients in the FlowTriever arm and 61 in the context arm, which included patients treated with systemic thrombolysis or anticoagulation. The primary endpoint, a composite of adverse in-hospital outcomes, was reached in 17% of FlowTriever patients, significantly lower than the 32% performance goal and the 63.9% rate in the context arm. In-hospital mortality was dramatically lower in the FlowTriever arm (1.9%) compared to the context arm (29.5%). 

When catheter-based treatment fails, surgical pulmonary embolectomy is a last-resort option. “Only a minority of the high-risk PE [patients] would qualify for rtPA without harmful side effects,” Dr. Rali concluded. “So think wise before you pull your trigger.” 
 

rtPA Not a Matter of the Past

In high-risk PE, the therapeutic priority is rapid hemodynamic stabilization and restoration of pulmonary blood flow to prevent cardiovascular collapse. Systemic thrombolysis acts quickly, reducing pulmonary vascular resistance and obstruction within hours, said Dr. Sanchez. 

Presenting at the ERS Congress, he reported numerous studies, including 15 randomized controlled trials that demonstrated its effectiveness in high-risk PE. The PEITHO trial, in particular, demonstrated the ability of systemic thrombolysis to reduce all-cause mortality and hemodynamic collapse within 7 days. 

However, this benefit comes at the cost of increased bleeding risk, including a 10% rate of major bleeding and a 2% risk for intracranial hemorrhage. “These data come from old studies using invasive diagnostic procedures, and with current diagnostic procedures, the rate of bleeding is probably lower,” Dr. Sanchez said. The risk of bleeding is also related to the type of thrombolytic agent, with tenecteplase being strongly associated with a higher risk of bleeding, while alteplase shows no increase in the risk of major bleeding, he added. New strategies like reduced-dose thrombolysis offer comparable efficacy and improved safety, as demonstrated in ongoing trials like  PEITHO-3, which aim to optimize the balance between efficacy and bleeding risk. Dr. Sanchez is the lead investigator of the PEITHO-3 study.

While rtPA might not be optimal for all patients, Dr. Sanchez thinks there is not enough evidence to replace it as a first-line treatment.

Existing studies on catheter-directed therapies often focus on surrogate endpoints, such as right-to-left ventricular ratio changes, rather than clinical outcomes like mortality, he said. Retrospective data suggest that catheter-directed therapies may reduce in-hospital mortality compared with systemic therapies, but they also increase the risk of intracranial bleeding, post-procedure complications, and device-related events.

Sanchez mentioned the same FLAME study described by Dr. Rali, which reported a 23% rate of device-related complications and 11% major bleeding in patients treated with catheter-directed therapies. 

“Systemic thrombolysis remains the first treatment of choice,” Dr. Sanchez concluded. “The use of catheter-directed treatment should be discussed as an alternative in case of contraindications.”
 

The Debate Continues

Numerous ongoing clinical studies, such as the FLARE trial, will address gaps in evidence and refine treatment protocols, potentially reshaping the standard of care in high-risk PE in the near future by providing new data on the efficacy and safety of existing and emerging therapies.

“The coming data will make it clearer what the best option is,” said Thamer Al Khouzaie, MD, a pulmonary medicine consultant at Johns Hopkins Aramco Healthcare in Dhahran, Saudi Arabia. For now, he said, systemic thrombolysis remains the best option for most patients because it is widely available, easily administered with intravenous infusion, and at a limited cost. Catheter-directed treatment and surgical options are only available in specialized centers, require expertise and training, and are also very expensive.

Dr. Rali, Dr. Sanchez, and Dr. Khouzaie report no relevant financial relationships.
 

A version of this article appeared on Medscape.com.

The respiratory community is interested in artificial intelligence (AI) because it can improve the effectiveness of our care delivery processes. AI is a group of nonhuman techniques that utilize automated learning methods to extract information from datasets through generalization, classification, prediction, and association. In other words, AI is the simulation of human intelligence processes by machines. The branches of AI include natural language processing, speech recognition, machine vision, and expert systems. AI can make clinical care more efficient; however, many find its confusing terminology to be a barrier.¹ This article provides concise definitions of AI terms and is intended to help physicians better understand how AI methods can be applied to clinical care. The clinical application of natural language processing and machine vision applications are more clinically intuitive than the roles of machine learning algorithms.

Machine learning and algorithms

Machine learning is a branch of AI that uses data and algorithms to mimic human reasoning through classification, pattern recognition, and prediction. Supervised and unsupervised machine-learning algorithms can analyze data and recognize undetected associations and relationships.

CHEST

Supervised learning involves training models to make predictions using data sets that have correct outcome parameters called labels using predictive fields called features. Machine learning uses iterative analysis including random forest, decision tree, and gradient boosting methods that minimize predictive error metrics (see Table 1). This approach is widely used to improve diagnoses, predict disease progression or exacerbation, and personalize treatment plan modifications.

Supervised machine learning methods can be particularly effective for processing large volumes of medical information to identify patterns and make accurate predictions. In contrast, unsupervised learning techniques can analyze unlabeled data and help clinicians uncover hidden patterns or undetected groupings. Techniques including clustering, exploratory analysis, and anomaly detection are common applications. Both of these machine-learning approaches can be used to extract novel and helpful insights.

CHEST

Challenges of algorithms and calibration

Machine learning algorithms vary in complexity and accuracy. For example, a simple logistic regression model using time, date, latitude, and indoor/outdoor location can accurately recommend sunscreen application. This model identifies when solar radiation is high enough to warrant sunscreen use, avoiding unnecessary recommendations during nighttime hours or indoor locations. A more complex model might suffer from model overfitting and inappropriately suggest sunscreen before a tanning salon visit.

CHEST

Complex machine learning models, like support vector machine (SVM) and decision tree methods, are useful when many features have predictive power. SVMs are useful for small but complex datasets. Features are manipulated in a multidimensional space to maximize the “margins” separating 2 groups. Decision tree analyses are useful when more than 2 groups are being analyzed. SVM and decision tree models can also lose accuracy by data overfitting.

Consider the development of an SVM analysis to predict whether an individual is a fellow or a senior faculty member. One could use high gray hair density feature values to identify senior faculty. When this algorithm is applied to an individual with alopecia, no amount of model adjustment can achieve high levels of discrimination because no hair is present. Rather than overfitting the model by adding more nonpredictive features, individuals with alopecia are analyzed by their own algorithm (tree) that uses the skin wrinkle/solar damage rather than the gray hair density feature.

Decision tree ensemble algorithms like random forest and gradient boosting use feature-based decision trees to process and classify data. Random forests are robust, scalable, and versatile, providing classifications and predictions while protecting against inaccurate data and outliers and have the advantage of being able to handle both categorical and continuous features. Gradient boosting, which uses an ensemble of weak decision trees, often outperforms random forests when individual trees perform only slightly better than random chance. This method incrementally builds the model by optimizing the residual errors of previous trees, leading to more accurate predictions.

In practice, gradient boosting can be used to fine-tune diagnostic models, improving their precision and reliability. A recent example of how gradient boosting of random forest predictions yielded highly accurate predictions for unplanned vasopressor initiation and intubation events 2 to 4 hours before an ICU adult became unstable.²

Assessing the accuracy of algorithms

The value of the data set is directly related to the accuracy of its labels. Traditional methods that measure model performance, such as sensitivity, specificity, and predictive values (PPV and NPV), have important limitations. They provide little insight into how a complex model made its prediction. Understanding which individual features drive model accuracy is key to fostering trust in model predictions. This can be done by comparing model output with and without including individual features. The results of all possible combinations are aggregated according to feature importance, which is summarized in the Shapley value for each model feature. Higher values indicate greater relative importance. SHAP plots help identify how much and how often specific features change the model output, presenting values of individual model estimates with and without a specific feature (see Figure 1).

CHEST

Promoting AI use

AI and machine learning algorithms are coming to patient care. Understanding the language of AI helps caregivers integrate these tools into their practices. The science of AI faces serious challenges. Algorithms must be recalibrated to keep pace as therapies advance, disease prevalence changes, and our population ages. AI must address new challenges as they confront those suffering from respiratory diseases. This resource encourages clinicians with novel approaches by using AI methodologies to advance their development. We can better address future health care needs by promoting the equitable use of AI technologies, especially among socially disadvantaged developers.

References

1. Lilly CM, Soni AV, Dunlap D, et al. Advancing point of care testing by application of machine learning techniques and artificial intelligence. Chest. 2024 (in press).

2. Lilly CM, Kirk D, Pessach IM, et al. Application of machine learning models to biomedical and information system signals from critically ill adults. Chest. 2024;165(5):1139-1148.
 

The respiratory community is interested in artificial intelligence (AI) because it can improve the effectiveness of our care delivery processes. AI is a group of nonhuman techniques that utilize automated learning methods to extract information from datasets through generalization, classification, prediction, and association. In other words, AI is the simulation of human intelligence processes by machines. The branches of AI include natural language processing, speech recognition, machine vision, and expert systems. AI can make clinical care more efficient; however, many find its confusing terminology to be a barrier.¹ This article provides concise definitions of AI terms and is intended to help physicians better understand how AI methods can be applied to clinical care. The clinical application of natural language processing and machine vision applications are more clinically intuitive than the roles of machine learning algorithms.

Machine learning and algorithms

Machine learning is a branch of AI that uses data and algorithms to mimic human reasoning through classification, pattern recognition, and prediction. Supervised and unsupervised machine-learning algorithms can analyze data and recognize undetected associations and relationships.

CHEST

Supervised learning involves training models to make predictions using data sets that have correct outcome parameters called labels using predictive fields called features. Machine learning uses iterative analysis including random forest, decision tree, and gradient boosting methods that minimize predictive error metrics (see Table 1). This approach is widely used to improve diagnoses, predict disease progression or exacerbation, and personalize treatment plan modifications.

Supervised machine learning methods can be particularly effective for processing large volumes of medical information to identify patterns and make accurate predictions. In contrast, unsupervised learning techniques can analyze unlabeled data and help clinicians uncover hidden patterns or undetected groupings. Techniques including clustering, exploratory analysis, and anomaly detection are common applications. Both of these machine-learning approaches can be used to extract novel and helpful insights.

CHEST

Challenges of algorithms and calibration

Machine learning algorithms vary in complexity and accuracy. For example, a simple logistic regression model using time, date, latitude, and indoor/outdoor location can accurately recommend sunscreen application. This model identifies when solar radiation is high enough to warrant sunscreen use, avoiding unnecessary recommendations during nighttime hours or indoor locations. A more complex model might suffer from model overfitting and inappropriately suggest sunscreen before a tanning salon visit.

CHEST

Complex machine learning models, like support vector machine (SVM) and decision tree methods, are useful when many features have predictive power. SVMs are useful for small but complex datasets. Features are manipulated in a multidimensional space to maximize the “margins” separating 2 groups. Decision tree analyses are useful when more than 2 groups are being analyzed. SVM and decision tree models can also lose accuracy by data overfitting.

Consider the development of an SVM analysis to predict whether an individual is a fellow or a senior faculty member. One could use high gray hair density feature values to identify senior faculty. When this algorithm is applied to an individual with alopecia, no amount of model adjustment can achieve high levels of discrimination because no hair is present. Rather than overfitting the model by adding more nonpredictive features, individuals with alopecia are analyzed by their own algorithm (tree) that uses the skin wrinkle/solar damage rather than the gray hair density feature.

Decision tree ensemble algorithms like random forest and gradient boosting use feature-based decision trees to process and classify data. Random forests are robust, scalable, and versatile, providing classifications and predictions while protecting against inaccurate data and outliers and have the advantage of being able to handle both categorical and continuous features. Gradient boosting, which uses an ensemble of weak decision trees, often outperforms random forests when individual trees perform only slightly better than random chance. This method incrementally builds the model by optimizing the residual errors of previous trees, leading to more accurate predictions.

In practice, gradient boosting can be used to fine-tune diagnostic models, improving their precision and reliability. A recent example of how gradient boosting of random forest predictions yielded highly accurate predictions for unplanned vasopressor initiation and intubation events 2 to 4 hours before an ICU adult became unstable.²

Assessing the accuracy of algorithms

The value of the data set is directly related to the accuracy of its labels. Traditional methods that measure model performance, such as sensitivity, specificity, and predictive values (PPV and NPV), have important limitations. They provide little insight into how a complex model made its prediction. Understanding which individual features drive model accuracy is key to fostering trust in model predictions. This can be done by comparing model output with and without including individual features. The results of all possible combinations are aggregated according to feature importance, which is summarized in the Shapley value for each model feature. Higher values indicate greater relative importance. SHAP plots help identify how much and how often specific features change the model output, presenting values of individual model estimates with and without a specific feature (see Figure 1).

CHEST

Promoting AI use

AI and machine learning algorithms are coming to patient care. Understanding the language of AI helps caregivers integrate these tools into their practices. The science of AI faces serious challenges. Algorithms must be recalibrated to keep pace as therapies advance, disease prevalence changes, and our population ages. AI must address new challenges as they confront those suffering from respiratory diseases. This resource encourages clinicians with novel approaches by using AI methodologies to advance their development. We can better address future health care needs by promoting the equitable use of AI technologies, especially among socially disadvantaged developers.

References

1. Lilly CM, Soni AV, Dunlap D, et al. Advancing point of care testing by application of machine learning techniques and artificial intelligence. Chest. 2024 (in press).

2. Lilly CM, Kirk D, Pessach IM, et al. Application of machine learning models to biomedical and information system signals from critically ill adults. Chest. 2024;165(5):1139-1148.
 

The respiratory community is interested in artificial intelligence (AI) because it can improve the effectiveness of our care delivery processes. AI is a group of nonhuman techniques that utilize automated learning methods to extract information from datasets through generalization, classification, prediction, and association. In other words, AI is the simulation of human intelligence processes by machines. The branches of AI include natural language processing, speech recognition, machine vision, and expert systems. AI can make clinical care more efficient; however, many find its confusing terminology to be a barrier.¹ This article provides concise definitions of AI terms and is intended to help physicians better understand how AI methods can be applied to clinical care. The clinical application of natural language processing and machine vision applications are more clinically intuitive than the roles of machine learning algorithms.

Machine learning and algorithms

Machine learning is a branch of AI that uses data and algorithms to mimic human reasoning through classification, pattern recognition, and prediction. Supervised and unsupervised machine-learning algorithms can analyze data and recognize undetected associations and relationships.

CHEST

Supervised learning involves training models to make predictions using data sets that have correct outcome parameters called labels using predictive fields called features. Machine learning uses iterative analysis including random forest, decision tree, and gradient boosting methods that minimize predictive error metrics (see Table 1). This approach is widely used to improve diagnoses, predict disease progression or exacerbation, and personalize treatment plan modifications.

Supervised machine learning methods can be particularly effective for processing large volumes of medical information to identify patterns and make accurate predictions. In contrast, unsupervised learning techniques can analyze unlabeled data and help clinicians uncover hidden patterns or undetected groupings. Techniques including clustering, exploratory analysis, and anomaly detection are common applications. Both of these machine-learning approaches can be used to extract novel and helpful insights.

CHEST

Challenges of algorithms and calibration

Machine learning algorithms vary in complexity and accuracy. For example, a simple logistic regression model using time, date, latitude, and indoor/outdoor location can accurately recommend sunscreen application. This model identifies when solar radiation is high enough to warrant sunscreen use, avoiding unnecessary recommendations during nighttime hours or indoor locations. A more complex model might suffer from model overfitting and inappropriately suggest sunscreen before a tanning salon visit.

CHEST

Complex machine learning models, like support vector machine (SVM) and decision tree methods, are useful when many features have predictive power. SVMs are useful for small but complex datasets. Features are manipulated in a multidimensional space to maximize the “margins” separating 2 groups. Decision tree analyses are useful when more than 2 groups are being analyzed. SVM and decision tree models can also lose accuracy by data overfitting.

Consider the development of an SVM analysis to predict whether an individual is a fellow or a senior faculty member. One could use high gray hair density feature values to identify senior faculty. When this algorithm is applied to an individual with alopecia, no amount of model adjustment can achieve high levels of discrimination because no hair is present. Rather than overfitting the model by adding more nonpredictive features, individuals with alopecia are analyzed by their own algorithm (tree) that uses the skin wrinkle/solar damage rather than the gray hair density feature.

Decision tree ensemble algorithms like random forest and gradient boosting use feature-based decision trees to process and classify data. Random forests are robust, scalable, and versatile, providing classifications and predictions while protecting against inaccurate data and outliers and have the advantage of being able to handle both categorical and continuous features. Gradient boosting, which uses an ensemble of weak decision trees, often outperforms random forests when individual trees perform only slightly better than random chance. This method incrementally builds the model by optimizing the residual errors of previous trees, leading to more accurate predictions.

In practice, gradient boosting can be used to fine-tune diagnostic models, improving their precision and reliability. A recent example of how gradient boosting of random forest predictions yielded highly accurate predictions for unplanned vasopressor initiation and intubation events 2 to 4 hours before an ICU adult became unstable.²

Assessing the accuracy of algorithms

The value of the data set is directly related to the accuracy of its labels. Traditional methods that measure model performance, such as sensitivity, specificity, and predictive values (PPV and NPV), have important limitations. They provide little insight into how a complex model made its prediction. Understanding which individual features drive model accuracy is key to fostering trust in model predictions. This can be done by comparing model output with and without including individual features. The results of all possible combinations are aggregated according to feature importance, which is summarized in the Shapley value for each model feature. Higher values indicate greater relative importance. SHAP plots help identify how much and how often specific features change the model output, presenting values of individual model estimates with and without a specific feature (see Figure 1).

CHEST

Promoting AI use

AI and machine learning algorithms are coming to patient care. Understanding the language of AI helps caregivers integrate these tools into their practices. The science of AI faces serious challenges. Algorithms must be recalibrated to keep pace as therapies advance, disease prevalence changes, and our population ages. AI must address new challenges as they confront those suffering from respiratory diseases. This resource encourages clinicians with novel approaches by using AI methodologies to advance their development. We can better address future health care needs by promoting the equitable use of AI technologies, especially among socially disadvantaged developers.

References

1. Lilly CM, Soni AV, Dunlap D, et al. Advancing point of care testing by application of machine learning techniques and artificial intelligence. Chest. 2024 (in press).

2. Lilly CM, Kirk D, Pessach IM, et al. Application of machine learning models to biomedical and information system signals from critically ill adults. Chest. 2024;165(5):1139-1148.
 

Ah, blood. That sweet nectar of life that quiets angina, abolishes dyspnea, prevents orthostatic syncope, and quells sinus tachycardia. As a cardiologist, I am an unabashed hemophile. 

But we liberal transfusionists are challenged on every request for consideration of transfusion. Whereas the polite may resort to whispered skepticism, vehement critics respond with scorn as if we’d asked them to burn aromatic herbs or fetch a bucket of leeches. And to what do we owe this pathological angst? The broad and persistent misinterpretation of the pesky TRICC trial (N Engl J Med. 1999;340:409-417). You know; the one that should have been published with a boxed warning stating: “Misinterpretation of this trial could result in significant harm.” 
 

Point 1: Our Actively Bleeding Patient is Not a TRICC Patient. 

Published in 1999, the TRICC trial enrolled critical anemic patients older than 16 years who were stable after fluid resuscitation and were not actively bleeding. They had a hemoglobin level < 9 g/dL and were expected to stay in the intensive care unit (ICU) for more than 24 hours. They were randomly assigned to either a conservative trigger for transfusion of < 7 g/dL or a liberal threshold of < 10 g/dL. Mortality at 30 days was lower with the conservative approach — 18.7% vs 23.3% — but the difference was not statistically significant (P = .11). The findings were similar for the secondary endpoints of inpatient mortality (22.2% vs 28.1%; P = .05) and ICU mortality (13.9% vs 16.2%; P = .29). 

One must admit that these P values are not impressive, and the authors’ conclusion should have warranted caution: “A restrictive strategy ... is at least as effective as and possibly superior to a liberal transfusion strategy in critically ill patients, with the possible exception of patients with acute myocardial infarction and unstable angina.” 
 

Point 2: Our Critically Ill Cardiac Patient is Unlikely to be a “TRICC” Patient.

Another criticism of TRICC is that only 13% of those assessed and 26% of those eligible were enrolled, mostly owing to physician refusal. Only 26% of enrolled patients had cardiac disease. This makes the TRICC population highly selected and not representative of typical ICU patients. 

To prove my point that the edict against higher transfusion thresholds can be dangerous, I’ll describe my most recent interface with TRICC trial misinterpretation 
 

A Case in Point

The patient, Mrs. Kemp,* is 79 years old and has been on aspirin for years following coronary stent placement. One evening, she began spurting bright red blood from her rectum, interrupted only briefly by large clots the consistency of jellied cranberries. When she arrived at the hospital, she was hemodynamically stable, with a hemoglobin level of 10 g/dL, down from her usual 12 g/dL. That level bolstered the confidence of her provider, who insisted that she be managed conservatively. 

Mrs. Kemp was transferred to the ward, where she continued to bleed briskly. Over the next 2 hours, her hemoglobin level dropped to 9 g/dL, then 8 g/dL. Her daughter, a healthcare worker, requested a transfusion. The answer was, wait for it — the well-scripted, somewhat patronizing oft-quoted line, “The medical literature states that we need to wait for a hemoglobin level of 7 g/dL before we transfuse.” 

Later that evening, Mrs. Kemp’s systolic blood pressure dropped to the upper 80s, despite her usual hypertension. The provider was again comforted by the fact that she was not tachycardic (she had a pacemaker and was on bisoprolol). The next morning, Mrs. Kemp felt the need to defecate and was placed on the bedside commode and left to her privacy. Predictably, she became dizzy and experienced frank syncope. Thankfully, she avoided a hip fracture or worse. A stat hemoglobin returned at 6 g/dL. 

Her daughter said she literally heard the hallelujah chorus because her mother’s hemoglobin was finally below that much revered and often misleading threshold of 7 g/dL. Finally, there was an order for platelets and packed red cells. Five units later, Mr. Kemp achieved a hemoglobin of 8 g/dL and survived. Two more units and she was soaring at 9 g/dL! 
 

Lessons for Transfusion Conservatives

There are many lessons here. 

The TRICC study found that hemodynamically stable, asymptomatic patients who are not actively bleeding may well tolerate a hemoglobin level of 7 g/dL. But a patient with bright red blood actively pouring from an orifice and a rapidly declining hemoglobin level isn’t one of those people. Additionally, a patient who faints from hypovolemia is not one of those people. 

Patients with a history of bleeding presenting with new resting sinus tachycardia (in those who have chronotropic competence) should be presumed to be actively bleeding, and the findings of TRICC do not apply to them. Patients who have bled buckets on anticoagulant or antiplatelet therapies and have dropped their hemoglobin will probably continue to ooze and should be subject to a low threshold for transfusion. 

Additionally, anemic people who are hemodynamically stable but can’t walk without new significant shortness of air or new rest angina need blood, and sometimes at hemoglobin levels higher than generally accepted by conservative strategists. Finally, failing to treat or at least monitor patients who are spontaneously bleeding as aggressively as some trauma patients is a failure to provide proper medical care. 

The vast majority of my healthcare clinician colleagues are competent, compassionate individuals who can reasonably discuss the nuances of any medical scenario. One important distinction of a good medical team is the willingness to change course based on a change in patient status or the presentation of what may be new information for the provider. 

But those proud transfusion conservatives who will not budge until their threshold is met need to make certain their patient is truly subject to their supposed edicts. Our blood banks should not be more difficult to access than Fort Knox, and transfusion should be used appropriately and liberally in the hemodynamically unstable, the symptomatic, and active brisk bleeders. 

I beg staunch transfusion conservatives to consider how they might feel if someone stuck a magic spigot in their brachial artery and acutely drained their hemoglobin to that magic threshold of 7 g/dL. When syncope, shortness of air, fatigue, and angina find them, they may generate empathy for those who need transfusion. Might that do the TRICC? 

*Some details have been changed to conceal the identity of the patient, but the essence of the case has been preserved.

Dr. Walton-Shirley, a native Kentuckian who retired from full-time invasive cardiology and now does locums work in Montana, is a champion of physician rights and patient safety. She has disclosed no relevant financial relationships.

A version of this article appeared on Medscape.com.

Ah, blood. That sweet nectar of life that quiets angina, abolishes dyspnea, prevents orthostatic syncope, and quells sinus tachycardia. As a cardiologist, I am an unabashed hemophile. 

But we liberal transfusionists are challenged on every request for consideration of transfusion. Whereas the polite may resort to whispered skepticism, vehement critics respond with scorn as if we’d asked them to burn aromatic herbs or fetch a bucket of leeches. And to what do we owe this pathological angst? The broad and persistent misinterpretation of the pesky TRICC trial (N Engl J Med. 1999;340:409-417). You know; the one that should have been published with a boxed warning stating: “Misinterpretation of this trial could result in significant harm.” 
 

Point 1: Our Actively Bleeding Patient is Not a TRICC Patient. 

Published in 1999, the TRICC trial enrolled critical anemic patients older than 16 years who were stable after fluid resuscitation and were not actively bleeding. They had a hemoglobin level < 9 g/dL and were expected to stay in the intensive care unit (ICU) for more than 24 hours. They were randomly assigned to either a conservative trigger for transfusion of < 7 g/dL or a liberal threshold of < 10 g/dL. Mortality at 30 days was lower with the conservative approach — 18.7% vs 23.3% — but the difference was not statistically significant (P = .11). The findings were similar for the secondary endpoints of inpatient mortality (22.2% vs 28.1%; P = .05) and ICU mortality (13.9% vs 16.2%; P = .29). 

One must admit that these P values are not impressive, and the authors’ conclusion should have warranted caution: “A restrictive strategy ... is at least as effective as and possibly superior to a liberal transfusion strategy in critically ill patients, with the possible exception of patients with acute myocardial infarction and unstable angina.” 
 

Point 2: Our Critically Ill Cardiac Patient is Unlikely to be a “TRICC” Patient.

Another criticism of TRICC is that only 13% of those assessed and 26% of those eligible were enrolled, mostly owing to physician refusal. Only 26% of enrolled patients had cardiac disease. This makes the TRICC population highly selected and not representative of typical ICU patients. 

To prove my point that the edict against higher transfusion thresholds can be dangerous, I’ll describe my most recent interface with TRICC trial misinterpretation 
 

A Case in Point

The patient, Mrs. Kemp,* is 79 years old and has been on aspirin for years following coronary stent placement. One evening, she began spurting bright red blood from her rectum, interrupted only briefly by large clots the consistency of jellied cranberries. When she arrived at the hospital, she was hemodynamically stable, with a hemoglobin level of 10 g/dL, down from her usual 12 g/dL. That level bolstered the confidence of her provider, who insisted that she be managed conservatively. 

Mrs. Kemp was transferred to the ward, where she continued to bleed briskly. Over the next 2 hours, her hemoglobin level dropped to 9 g/dL, then 8 g/dL. Her daughter, a healthcare worker, requested a transfusion. The answer was, wait for it — the well-scripted, somewhat patronizing oft-quoted line, “The medical literature states that we need to wait for a hemoglobin level of 7 g/dL before we transfuse.” 

Later that evening, Mrs. Kemp’s systolic blood pressure dropped to the upper 80s, despite her usual hypertension. The provider was again comforted by the fact that she was not tachycardic (she had a pacemaker and was on bisoprolol). The next morning, Mrs. Kemp felt the need to defecate and was placed on the bedside commode and left to her privacy. Predictably, she became dizzy and experienced frank syncope. Thankfully, she avoided a hip fracture or worse. A stat hemoglobin returned at 6 g/dL. 

Her daughter said she literally heard the hallelujah chorus because her mother’s hemoglobin was finally below that much revered and often misleading threshold of 7 g/dL. Finally, there was an order for platelets and packed red cells. Five units later, Mr. Kemp achieved a hemoglobin of 8 g/dL and survived. Two more units and she was soaring at 9 g/dL! 
 

Lessons for Transfusion Conservatives

There are many lessons here. 

The TRICC study found that hemodynamically stable, asymptomatic patients who are not actively bleeding may well tolerate a hemoglobin level of 7 g/dL. But a patient with bright red blood actively pouring from an orifice and a rapidly declining hemoglobin level isn’t one of those people. Additionally, a patient who faints from hypovolemia is not one of those people. 

Patients with a history of bleeding presenting with new resting sinus tachycardia (in those who have chronotropic competence) should be presumed to be actively bleeding, and the findings of TRICC do not apply to them. Patients who have bled buckets on anticoagulant or antiplatelet therapies and have dropped their hemoglobin will probably continue to ooze and should be subject to a low threshold for transfusion. 

Additionally, anemic people who are hemodynamically stable but can’t walk without new significant shortness of air or new rest angina need blood, and sometimes at hemoglobin levels higher than generally accepted by conservative strategists. Finally, failing to treat or at least monitor patients who are spontaneously bleeding as aggressively as some trauma patients is a failure to provide proper medical care. 

The vast majority of my healthcare clinician colleagues are competent, compassionate individuals who can reasonably discuss the nuances of any medical scenario. One important distinction of a good medical team is the willingness to change course based on a change in patient status or the presentation of what may be new information for the provider. 

But those proud transfusion conservatives who will not budge until their threshold is met need to make certain their patient is truly subject to their supposed edicts. Our blood banks should not be more difficult to access than Fort Knox, and transfusion should be used appropriately and liberally in the hemodynamically unstable, the symptomatic, and active brisk bleeders. 

I beg staunch transfusion conservatives to consider how they might feel if someone stuck a magic spigot in their brachial artery and acutely drained their hemoglobin to that magic threshold of 7 g/dL. When syncope, shortness of air, fatigue, and angina find them, they may generate empathy for those who need transfusion. Might that do the TRICC? 

*Some details have been changed to conceal the identity of the patient, but the essence of the case has been preserved.

Dr. Walton-Shirley, a native Kentuckian who retired from full-time invasive cardiology and now does locums work in Montana, is a champion of physician rights and patient safety. She has disclosed no relevant financial relationships.

A version of this article appeared on Medscape.com.

Ah, blood. That sweet nectar of life that quiets angina, abolishes dyspnea, prevents orthostatic syncope, and quells sinus tachycardia. As a cardiologist, I am an unabashed hemophile. 

But we liberal transfusionists are challenged on every request for consideration of transfusion. Whereas the polite may resort to whispered skepticism, vehement critics respond with scorn as if we’d asked them to burn aromatic herbs or fetch a bucket of leeches. And to what do we owe this pathological angst? The broad and persistent misinterpretation of the pesky TRICC trial (N Engl J Med. 1999;340:409-417). You know; the one that should have been published with a boxed warning stating: “Misinterpretation of this trial could result in significant harm.” 
 

Point 1: Our Actively Bleeding Patient is Not a TRICC Patient. 

Published in 1999, the TRICC trial enrolled critical anemic patients older than 16 years who were stable after fluid resuscitation and were not actively bleeding. They had a hemoglobin level < 9 g/dL and were expected to stay in the intensive care unit (ICU) for more than 24 hours. They were randomly assigned to either a conservative trigger for transfusion of < 7 g/dL or a liberal threshold of < 10 g/dL. Mortality at 30 days was lower with the conservative approach — 18.7% vs 23.3% — but the difference was not statistically significant (P = .11). The findings were similar for the secondary endpoints of inpatient mortality (22.2% vs 28.1%; P = .05) and ICU mortality (13.9% vs 16.2%; P = .29). 

One must admit that these P values are not impressive, and the authors’ conclusion should have warranted caution: “A restrictive strategy ... is at least as effective as and possibly superior to a liberal transfusion strategy in critically ill patients, with the possible exception of patients with acute myocardial infarction and unstable angina.” 
 

Point 2: Our Critically Ill Cardiac Patient is Unlikely to be a “TRICC” Patient.

Another criticism of TRICC is that only 13% of those assessed and 26% of those eligible were enrolled, mostly owing to physician refusal. Only 26% of enrolled patients had cardiac disease. This makes the TRICC population highly selected and not representative of typical ICU patients. 

To prove my point that the edict against higher transfusion thresholds can be dangerous, I’ll describe my most recent interface with TRICC trial misinterpretation 
 

A Case in Point

The patient, Mrs. Kemp,* is 79 years old and has been on aspirin for years following coronary stent placement. One evening, she began spurting bright red blood from her rectum, interrupted only briefly by large clots the consistency of jellied cranberries. When she arrived at the hospital, she was hemodynamically stable, with a hemoglobin level of 10 g/dL, down from her usual 12 g/dL. That level bolstered the confidence of her provider, who insisted that she be managed conservatively. 

Mrs. Kemp was transferred to the ward, where she continued to bleed briskly. Over the next 2 hours, her hemoglobin level dropped to 9 g/dL, then 8 g/dL. Her daughter, a healthcare worker, requested a transfusion. The answer was, wait for it — the well-scripted, somewhat patronizing oft-quoted line, “The medical literature states that we need to wait for a hemoglobin level of 7 g/dL before we transfuse.” 

Later that evening, Mrs. Kemp’s systolic blood pressure dropped to the upper 80s, despite her usual hypertension. The provider was again comforted by the fact that she was not tachycardic (she had a pacemaker and was on bisoprolol). The next morning, Mrs. Kemp felt the need to defecate and was placed on the bedside commode and left to her privacy. Predictably, she became dizzy and experienced frank syncope. Thankfully, she avoided a hip fracture or worse. A stat hemoglobin returned at 6 g/dL. 

Her daughter said she literally heard the hallelujah chorus because her mother’s hemoglobin was finally below that much revered and often misleading threshold of 7 g/dL. Finally, there was an order for platelets and packed red cells. Five units later, Mr. Kemp achieved a hemoglobin of 8 g/dL and survived. Two more units and she was soaring at 9 g/dL! 
 

Lessons for Transfusion Conservatives

There are many lessons here. 

The TRICC study found that hemodynamically stable, asymptomatic patients who are not actively bleeding may well tolerate a hemoglobin level of 7 g/dL. But a patient with bright red blood actively pouring from an orifice and a rapidly declining hemoglobin level isn’t one of those people. Additionally, a patient who faints from hypovolemia is not one of those people. 

Patients with a history of bleeding presenting with new resting sinus tachycardia (in those who have chronotropic competence) should be presumed to be actively bleeding, and the findings of TRICC do not apply to them. Patients who have bled buckets on anticoagulant or antiplatelet therapies and have dropped their hemoglobin will probably continue to ooze and should be subject to a low threshold for transfusion. 

Additionally, anemic people who are hemodynamically stable but can’t walk without new significant shortness of air or new rest angina need blood, and sometimes at hemoglobin levels higher than generally accepted by conservative strategists. Finally, failing to treat or at least monitor patients who are spontaneously bleeding as aggressively as some trauma patients is a failure to provide proper medical care. 

The vast majority of my healthcare clinician colleagues are competent, compassionate individuals who can reasonably discuss the nuances of any medical scenario. One important distinction of a good medical team is the willingness to change course based on a change in patient status or the presentation of what may be new information for the provider. 

But those proud transfusion conservatives who will not budge until their threshold is met need to make certain their patient is truly subject to their supposed edicts. Our blood banks should not be more difficult to access than Fort Knox, and transfusion should be used appropriately and liberally in the hemodynamically unstable, the symptomatic, and active brisk bleeders. 

I beg staunch transfusion conservatives to consider how they might feel if someone stuck a magic spigot in their brachial artery and acutely drained their hemoglobin to that magic threshold of 7 g/dL. When syncope, shortness of air, fatigue, and angina find them, they may generate empathy for those who need transfusion. Might that do the TRICC? 

*Some details have been changed to conceal the identity of the patient, but the essence of the case has been preserved.

Dr. Walton-Shirley, a native Kentuckian who retired from full-time invasive cardiology and now does locums work in Montana, is a champion of physician rights and patient safety. She has disclosed no relevant financial relationships.

A version of this article appeared on Medscape.com.

In July 2024, a 33-year-old woman with type 1 diabetes was boating on a hot day when her insulin delivery device slipped off. By the time she was able to exit the river, she was clearly ill, and an ambulance was called. The hospital was at capacity. Lying in the hallway, she was treated with fluids but not insulin, despite her boyfriend repeatedly telling the staff she had diabetes. She was released while still vomiting. The next morning, her boyfriend found her dead.

This story was shared by a friend of the woman in a Facebook group for people with type 1 diabetes and later confirmed by the boyfriend in a separate heartbreaking post. While it may be an extreme case, encounters with a lack of knowledge about type 1 diabetes in healthcare settings are quite common, sometimes resulting in serious adverse consequences.

In my 50+ years of living with the condition, I’ve lost track of the number of times I’ve had to speak up for myself, correct errors, raise issues that haven’t been considered, and educate nonspecialist healthcare professionals about even some of the basics.

Type 1 diabetes is an autoimmune condition in which the insulin-producing cells in the pancreas are destroyed, necessitating lifelong insulin treatment. Type 2, in contrast, arises from a combination of insulin resistance and decreased insulin production. Type 1 accounts for just 5% of all people with diabetes, but at a prevalence of about 1 in 200, it’s not rare. And that’s not even counting the adults who have been misdiagnosed as having type 2 but who actually have type 1.

As a general rule, people with type 1 diabetes are more insulin sensitive than those with type 2 and more prone to both hyper- and hypoglycemia. Blood sugar levels tend to be more labile and less predictable, even under normal circumstances. Recent advances in hybrid closed-loop technology have been extremely helpful in reducing the swings, but the systems aren’t foolproof yet. They still require user input (ie, guesswork), so there’s still room for error.

Managing type 1 diabetes is challenging even for endocrinologists. But here are some very important basics that every healthcare provider should know.
 

We Need Insulin 24/7

Never, ever withhold insulin from a person with type 1 diabetes, for any reason. Even when not eating — or when vomiting — we still need basal (background) insulin, either via long-acting analog or a pump infusion. The dose may need to be lowered to avoid hypoglycemia, but if insulin is stopped, diabetic ketoacidosis will result. And if that continues, death will follow.

This should be basic knowledge, but I’ve read and heard far too many stories of insulin being withheld from people with type 1 in various settings, including emergency departments, psychiatric facilities, and jails. On Facebook, people with type 1 diabetes often report being told not to take their insulin the morning before a procedure, while more than one has described “sneaking” their own insulin while hospitalized because they weren’t receiving any or not receiving enough.

On the flip side, although insulin needs are very individual, the amount needed for someone with type 1 is typically considerably less than for a person with type 2. Too much can result in severe hypoglycemia. There are lots of stories from people with type 1 diabetes who had to battle with hospital staff who tried to give them much higher doses than they knew they needed.

The American Diabetes Association recommends that people with type 1 diabetes who are hospitalized be allowed to wear their devices and self-manage to the degree possible. And please, listen to us when we tell you what we know about our own condition.
 

Fasting Is Fraught

I cringe every time I’m told to fast for a test or procedure. Fasting poses a risk for hypoglycemia in people with type 1 diabetes, even when using state-of-the-art technology. Fasting should not be required unless absolutely necessary, especially for routine lab tests.

Saleh Aldasouqi, MD, chief of endocrinology at Michigan State University, East Lansing, Michigan, has published several papers on a phenomenon he calls “Fasting-Evoked En Route Hypoglycemia in Diabetes,” in which patients who fast overnight and skip breakfast experience hypoglycemia on the way to the lab.

“Patients continue taking their diabetes medication but don’t eat anything, resulting in low blood sugar levels that cause them to have a hypoglycemic event while driving to or from the lab, putting themselves and others at risk,” Dr. Aldasouqi explained, adding that fasting often isn’t necessary for routine lipid panels.

If fasting is necessary, as for a surgical procedure that involves anesthesia, the need for insulin adjustment — NOT withholding — should be discussed with the patient to determine whether they can do it themselves or whether their diabetes provider should be consulted.

But again, this is tricky even for endocrinologists. True story: When I had my second carpal tunnel surgery in July 2019, my hand surgeon wisely scheduled me for his first procedure in the morning to minimize the length of time I’d have to fast. (He has type 1 diabetes himself, which helped.) My endocrinologist had advised me, per guidelines, to cut back my basal insulin infusion on my pump by 20% before going to bed.

But at bedtime, my continuous glucose monitor (CGM) showed that I was in the 170 mg/dL’s and rising, not entirely surprising since I’d cut back on my predinner insulin dose knowing I wouldn’t be able to eat if I dropped low later. I didn’t cut back the basal.

When I woke up, my glucose level was over 300 mg/dL. This time, stress was the likely cause. (That’s happened before.) Despite giving myself several small insulin boluses that morning without eating, my blood sugar was still about 345 mg/dL when I arrived at the hospital. The nurse told me that if it had been over 375 mg/dL, they would have had to cancel the surgery, but it wasn’t, so they went ahead. I have no idea how they came up with that cutoff.

Anyway, thankfully, everything went fine; I brought my blood sugar back in target range afterward and healed normally. Point being, type 1 diabetes management is a crazy balancing act, and guidelines only go so far.
 

We Don’t React Well to Steroids

If it’s absolutely necessary to give steroids to a person with type 1 diabetes for any reason, plans must be made in advance for the inevitable glucose spike. If the person doesn’t know how to adjust their insulin for it, please have them consult their diabetes provider. In my experience with locally injected corticosteroids, the spike is always higher and longer than I expected. Thankfully, I haven’t had to deal with systemic steroids, but my guess is they’re probably worse.

Procedures Can Be Pesky

People who wear insulin pumps and/or CGMs must remove them for MRI and certain other imaging procedures. In some cases — as with CGMs and the Omnipod insulin delivery device that can’t be put back on after removal — this necessitates advance planning to bring along replacement equipment for immediately after the procedure.

Diabetes devices can stay in place for other imaging studies, such as x-rays, most CT scans, ECGs, and ultrasounds. For heaven’s sake, don’t ask us to remove our devices if it isn’t totally necessary.

In general, surprises that affect blood sugar are a bad idea. I recently underwent a gastric emptying study. I knew the test would involve eating radioactive eggs, but I didn’t find out there’s also a jelly sandwich with two slices of white bread until the technician handed it to me and told me to eat it. I had to quickly give myself insulin, and of course my blood sugar spiked later. Had I been forewarned, I could have at least “pre-bolused” 15-20 minutes in advance to give the insulin more time to start working.

Another anecdote: Prior to a dental appointment that involved numbing my gums for an in-depth cleaning, my longtime dental hygienist told me “be sure to eat before you come.” I do appreciate her thinking of my diabetes. However, while that advice would have made sense long ago when treatment involved two daily insulin injections without dose adjustments, now it’s more complicated.

Today, when we eat foods containing carbohydrates, we typically take short-acting insulin, which can lead to hypoglycemia if the dose given exceeds the amount needed for the carbs, regardless of how much is eaten. Better to not eat at all (assuming the basal insulin dose is correct) or just eat protein. And for the provider, best to just tell the patient about the eating limitations and make sure they know how to handle them.
 

Duh, We Already Have Diabetes

I’ve heard of at least four instances in which pregnant women with type 1 diabetes have been ordered to undergo an oral glucose tolerance test to screen for gestational diabetes. In two cases, it was a “can you believe it?!” post on Facebook, with the women rightly refusing to take the test.

But in May 2024, a pregnant woman reported she actually drank the liquid, her blood sugar skyrocketed, she was vomiting, and she was in the midst of trying to bring her glucose level down with insulin on her own at home. She hadn’t objected to taking the test because “my ob.gyn. knows I have diabetes,” so she figured it was appropriate.

I don’t work in a healthcare setting, but here’s my guess: The ob.gyn. hadn’t actually ordered the test but had neglected to UN-order a routine test for a pregnant patient who already had diabetes and obviously should NOT be forced to drink a high-sugar liquid for no reason. If this is happening in pregnancies with type 1 diabetes, it most certainly could be as well for those with pre-existing type 2 diabetes. Clearly, something should be done to prevent this unnecessary and potentially harmful scenario.

In summary, I think I speak for everyone living with type 1 diabetes in saying that we would like to have confidence that healthcare providers in all settings can provide care for whatever brought us to them without adding to the daily burden we already carry. Let’s work together.

Reviewed by Saleh Aldasouqi, MD, chief of endocrinology at Michigan State University. A version of this article first appeared on Medscape.com.

In July 2024, a 33-year-old woman with type 1 diabetes was boating on a hot day when her insulin delivery device slipped off. By the time she was able to exit the river, she was clearly ill, and an ambulance was called. The hospital was at capacity. Lying in the hallway, she was treated with fluids but not insulin, despite her boyfriend repeatedly telling the staff she had diabetes. She was released while still vomiting. The next morning, her boyfriend found her dead.

This story was shared by a friend of the woman in a Facebook group for people with type 1 diabetes and later confirmed by the boyfriend in a separate heartbreaking post. While it may be an extreme case, encounters with a lack of knowledge about type 1 diabetes in healthcare settings are quite common, sometimes resulting in serious adverse consequences.

In my 50+ years of living with the condition, I’ve lost track of the number of times I’ve had to speak up for myself, correct errors, raise issues that haven’t been considered, and educate nonspecialist healthcare professionals about even some of the basics.

Type 1 diabetes is an autoimmune condition in which the insulin-producing cells in the pancreas are destroyed, necessitating lifelong insulin treatment. Type 2, in contrast, arises from a combination of insulin resistance and decreased insulin production. Type 1 accounts for just 5% of all people with diabetes, but at a prevalence of about 1 in 200, it’s not rare. And that’s not even counting the adults who have been misdiagnosed as having type 2 but who actually have type 1.

As a general rule, people with type 1 diabetes are more insulin sensitive than those with type 2 and more prone to both hyper- and hypoglycemia. Blood sugar levels tend to be more labile and less predictable, even under normal circumstances. Recent advances in hybrid closed-loop technology have been extremely helpful in reducing the swings, but the systems aren’t foolproof yet. They still require user input (ie, guesswork), so there’s still room for error.

Managing type 1 diabetes is challenging even for endocrinologists. But here are some very important basics that every healthcare provider should know.
 

We Need Insulin 24/7

Never, ever withhold insulin from a person with type 1 diabetes, for any reason. Even when not eating — or when vomiting — we still need basal (background) insulin, either via long-acting analog or a pump infusion. The dose may need to be lowered to avoid hypoglycemia, but if insulin is stopped, diabetic ketoacidosis will result. And if that continues, death will follow.

This should be basic knowledge, but I’ve read and heard far too many stories of insulin being withheld from people with type 1 in various settings, including emergency departments, psychiatric facilities, and jails. On Facebook, people with type 1 diabetes often report being told not to take their insulin the morning before a procedure, while more than one has described “sneaking” their own insulin while hospitalized because they weren’t receiving any or not receiving enough.

On the flip side, although insulin needs are very individual, the amount needed for someone with type 1 is typically considerably less than for a person with type 2. Too much can result in severe hypoglycemia. There are lots of stories from people with type 1 diabetes who had to battle with hospital staff who tried to give them much higher doses than they knew they needed.

The American Diabetes Association recommends that people with type 1 diabetes who are hospitalized be allowed to wear their devices and self-manage to the degree possible. And please, listen to us when we tell you what we know about our own condition.
 

Fasting Is Fraught

I cringe every time I’m told to fast for a test or procedure. Fasting poses a risk for hypoglycemia in people with type 1 diabetes, even when using state-of-the-art technology. Fasting should not be required unless absolutely necessary, especially for routine lab tests.

Saleh Aldasouqi, MD, chief of endocrinology at Michigan State University, East Lansing, Michigan, has published several papers on a phenomenon he calls “Fasting-Evoked En Route Hypoglycemia in Diabetes,” in which patients who fast overnight and skip breakfast experience hypoglycemia on the way to the lab.

“Patients continue taking their diabetes medication but don’t eat anything, resulting in low blood sugar levels that cause them to have a hypoglycemic event while driving to or from the lab, putting themselves and others at risk,” Dr. Aldasouqi explained, adding that fasting often isn’t necessary for routine lipid panels.

If fasting is necessary, as for a surgical procedure that involves anesthesia, the need for insulin adjustment — NOT withholding — should be discussed with the patient to determine whether they can do it themselves or whether their diabetes provider should be consulted.

But again, this is tricky even for endocrinologists. True story: When I had my second carpal tunnel surgery in July 2019, my hand surgeon wisely scheduled me for his first procedure in the morning to minimize the length of time I’d have to fast. (He has type 1 diabetes himself, which helped.) My endocrinologist had advised me, per guidelines, to cut back my basal insulin infusion on my pump by 20% before going to bed.

But at bedtime, my continuous glucose monitor (CGM) showed that I was in the 170 mg/dL’s and rising, not entirely surprising since I’d cut back on my predinner insulin dose knowing I wouldn’t be able to eat if I dropped low later. I didn’t cut back the basal.

When I woke up, my glucose level was over 300 mg/dL. This time, stress was the likely cause. (That’s happened before.) Despite giving myself several small insulin boluses that morning without eating, my blood sugar was still about 345 mg/dL when I arrived at the hospital. The nurse told me that if it had been over 375 mg/dL, they would have had to cancel the surgery, but it wasn’t, so they went ahead. I have no idea how they came up with that cutoff.

Anyway, thankfully, everything went fine; I brought my blood sugar back in target range afterward and healed normally. Point being, type 1 diabetes management is a crazy balancing act, and guidelines only go so far.
 

We Don’t React Well to Steroids

If it’s absolutely necessary to give steroids to a person with type 1 diabetes for any reason, plans must be made in advance for the inevitable glucose spike. If the person doesn’t know how to adjust their insulin for it, please have them consult their diabetes provider. In my experience with locally injected corticosteroids, the spike is always higher and longer than I expected. Thankfully, I haven’t had to deal with systemic steroids, but my guess is they’re probably worse.

Procedures Can Be Pesky

People who wear insulin pumps and/or CGMs must remove them for MRI and certain other imaging procedures. In some cases — as with CGMs and the Omnipod insulin delivery device that can’t be put back on after removal — this necessitates advance planning to bring along replacement equipment for immediately after the procedure.

Diabetes devices can stay in place for other imaging studies, such as x-rays, most CT scans, ECGs, and ultrasounds. For heaven’s sake, don’t ask us to remove our devices if it isn’t totally necessary.

In general, surprises that affect blood sugar are a bad idea. I recently underwent a gastric emptying study. I knew the test would involve eating radioactive eggs, but I didn’t find out there’s also a jelly sandwich with two slices of white bread until the technician handed it to me and told me to eat it. I had to quickly give myself insulin, and of course my blood sugar spiked later. Had I been forewarned, I could have at least “pre-bolused” 15-20 minutes in advance to give the insulin more time to start working.

Another anecdote: Prior to a dental appointment that involved numbing my gums for an in-depth cleaning, my longtime dental hygienist told me “be sure to eat before you come.” I do appreciate her thinking of my diabetes. However, while that advice would have made sense long ago when treatment involved two daily insulin injections without dose adjustments, now it’s more complicated.

Today, when we eat foods containing carbohydrates, we typically take short-acting insulin, which can lead to hypoglycemia if the dose given exceeds the amount needed for the carbs, regardless of how much is eaten. Better to not eat at all (assuming the basal insulin dose is correct) or just eat protein. And for the provider, best to just tell the patient about the eating limitations and make sure they know how to handle them.
 

Duh, We Already Have Diabetes

I’ve heard of at least four instances in which pregnant women with type 1 diabetes have been ordered to undergo an oral glucose tolerance test to screen for gestational diabetes. In two cases, it was a “can you believe it?!” post on Facebook, with the women rightly refusing to take the test.

But in May 2024, a pregnant woman reported she actually drank the liquid, her blood sugar skyrocketed, she was vomiting, and she was in the midst of trying to bring her glucose level down with insulin on her own at home. She hadn’t objected to taking the test because “my ob.gyn. knows I have diabetes,” so she figured it was appropriate.

I don’t work in a healthcare setting, but here’s my guess: The ob.gyn. hadn’t actually ordered the test but had neglected to UN-order a routine test for a pregnant patient who already had diabetes and obviously should NOT be forced to drink a high-sugar liquid for no reason. If this is happening in pregnancies with type 1 diabetes, it most certainly could be as well for those with pre-existing type 2 diabetes. Clearly, something should be done to prevent this unnecessary and potentially harmful scenario.

In summary, I think I speak for everyone living with type 1 diabetes in saying that we would like to have confidence that healthcare providers in all settings can provide care for whatever brought us to them without adding to the daily burden we already carry. Let’s work together.

Reviewed by Saleh Aldasouqi, MD, chief of endocrinology at Michigan State University. A version of this article first appeared on Medscape.com.

In July 2024, a 33-year-old woman with type 1 diabetes was boating on a hot day when her insulin delivery device slipped off. By the time she was able to exit the river, she was clearly ill, and an ambulance was called. The hospital was at capacity. Lying in the hallway, she was treated with fluids but not insulin, despite her boyfriend repeatedly telling the staff she had diabetes. She was released while still vomiting. The next morning, her boyfriend found her dead.

This story was shared by a friend of the woman in a Facebook group for people with type 1 diabetes and later confirmed by the boyfriend in a separate heartbreaking post. While it may be an extreme case, encounters with a lack of knowledge about type 1 diabetes in healthcare settings are quite common, sometimes resulting in serious adverse consequences.

In my 50+ years of living with the condition, I’ve lost track of the number of times I’ve had to speak up for myself, correct errors, raise issues that haven’t been considered, and educate nonspecialist healthcare professionals about even some of the basics.

Type 1 diabetes is an autoimmune condition in which the insulin-producing cells in the pancreas are destroyed, necessitating lifelong insulin treatment. Type 2, in contrast, arises from a combination of insulin resistance and decreased insulin production. Type 1 accounts for just 5% of all people with diabetes, but at a prevalence of about 1 in 200, it’s not rare. And that’s not even counting the adults who have been misdiagnosed as having type 2 but who actually have type 1.

As a general rule, people with type 1 diabetes are more insulin sensitive than those with type 2 and more prone to both hyper- and hypoglycemia. Blood sugar levels tend to be more labile and less predictable, even under normal circumstances. Recent advances in hybrid closed-loop technology have been extremely helpful in reducing the swings, but the systems aren’t foolproof yet. They still require user input (ie, guesswork), so there’s still room for error.

Managing type 1 diabetes is challenging even for endocrinologists. But here are some very important basics that every healthcare provider should know.
 

We Need Insulin 24/7

Never, ever withhold insulin from a person with type 1 diabetes, for any reason. Even when not eating — or when vomiting — we still need basal (background) insulin, either via long-acting analog or a pump infusion. The dose may need to be lowered to avoid hypoglycemia, but if insulin is stopped, diabetic ketoacidosis will result. And if that continues, death will follow.

This should be basic knowledge, but I’ve read and heard far too many stories of insulin being withheld from people with type 1 in various settings, including emergency departments, psychiatric facilities, and jails. On Facebook, people with type 1 diabetes often report being told not to take their insulin the morning before a procedure, while more than one has described “sneaking” their own insulin while hospitalized because they weren’t receiving any or not receiving enough.

On the flip side, although insulin needs are very individual, the amount needed for someone with type 1 is typically considerably less than for a person with type 2. Too much can result in severe hypoglycemia. There are lots of stories from people with type 1 diabetes who had to battle with hospital staff who tried to give them much higher doses than they knew they needed.

The American Diabetes Association recommends that people with type 1 diabetes who are hospitalized be allowed to wear their devices and self-manage to the degree possible. And please, listen to us when we tell you what we know about our own condition.
 

Fasting Is Fraught

I cringe every time I’m told to fast for a test or procedure. Fasting poses a risk for hypoglycemia in people with type 1 diabetes, even when using state-of-the-art technology. Fasting should not be required unless absolutely necessary, especially for routine lab tests.

Saleh Aldasouqi, MD, chief of endocrinology at Michigan State University, East Lansing, Michigan, has published several papers on a phenomenon he calls “Fasting-Evoked En Route Hypoglycemia in Diabetes,” in which patients who fast overnight and skip breakfast experience hypoglycemia on the way to the lab.

“Patients continue taking their diabetes medication but don’t eat anything, resulting in low blood sugar levels that cause them to have a hypoglycemic event while driving to or from the lab, putting themselves and others at risk,” Dr. Aldasouqi explained, adding that fasting often isn’t necessary for routine lipid panels.

If fasting is necessary, as for a surgical procedure that involves anesthesia, the need for insulin adjustment — NOT withholding — should be discussed with the patient to determine whether they can do it themselves or whether their diabetes provider should be consulted.

But again, this is tricky even for endocrinologists. True story: When I had my second carpal tunnel surgery in July 2019, my hand surgeon wisely scheduled me for his first procedure in the morning to minimize the length of time I’d have to fast. (He has type 1 diabetes himself, which helped.) My endocrinologist had advised me, per guidelines, to cut back my basal insulin infusion on my pump by 20% before going to bed.

But at bedtime, my continuous glucose monitor (CGM) showed that I was in the 170 mg/dL’s and rising, not entirely surprising since I’d cut back on my predinner insulin dose knowing I wouldn’t be able to eat if I dropped low later. I didn’t cut back the basal.

When I woke up, my glucose level was over 300 mg/dL. This time, stress was the likely cause. (That’s happened before.) Despite giving myself several small insulin boluses that morning without eating, my blood sugar was still about 345 mg/dL when I arrived at the hospital. The nurse told me that if it had been over 375 mg/dL, they would have had to cancel the surgery, but it wasn’t, so they went ahead. I have no idea how they came up with that cutoff.

Anyway, thankfully, everything went fine; I brought my blood sugar back in target range afterward and healed normally. Point being, type 1 diabetes management is a crazy balancing act, and guidelines only go so far.
 

We Don’t React Well to Steroids

If it’s absolutely necessary to give steroids to a person with type 1 diabetes for any reason, plans must be made in advance for the inevitable glucose spike. If the person doesn’t know how to adjust their insulin for it, please have them consult their diabetes provider. In my experience with locally injected corticosteroids, the spike is always higher and longer than I expected. Thankfully, I haven’t had to deal with systemic steroids, but my guess is they’re probably worse.

Procedures Can Be Pesky

People who wear insulin pumps and/or CGMs must remove them for MRI and certain other imaging procedures. In some cases — as with CGMs and the Omnipod insulin delivery device that can’t be put back on after removal — this necessitates advance planning to bring along replacement equipment for immediately after the procedure.

Diabetes devices can stay in place for other imaging studies, such as x-rays, most CT scans, ECGs, and ultrasounds. For heaven’s sake, don’t ask us to remove our devices if it isn’t totally necessary.

In general, surprises that affect blood sugar are a bad idea. I recently underwent a gastric emptying study. I knew the test would involve eating radioactive eggs, but I didn’t find out there’s also a jelly sandwich with two slices of white bread until the technician handed it to me and told me to eat it. I had to quickly give myself insulin, and of course my blood sugar spiked later. Had I been forewarned, I could have at least “pre-bolused” 15-20 minutes in advance to give the insulin more time to start working.

Another anecdote: Prior to a dental appointment that involved numbing my gums for an in-depth cleaning, my longtime dental hygienist told me “be sure to eat before you come.” I do appreciate her thinking of my diabetes. However, while that advice would have made sense long ago when treatment involved two daily insulin injections without dose adjustments, now it’s more complicated.

Today, when we eat foods containing carbohydrates, we typically take short-acting insulin, which can lead to hypoglycemia if the dose given exceeds the amount needed for the carbs, regardless of how much is eaten. Better to not eat at all (assuming the basal insulin dose is correct) or just eat protein. And for the provider, best to just tell the patient about the eating limitations and make sure they know how to handle them.
 

Duh, We Already Have Diabetes

I’ve heard of at least four instances in which pregnant women with type 1 diabetes have been ordered to undergo an oral glucose tolerance test to screen for gestational diabetes. In two cases, it was a “can you believe it?!” post on Facebook, with the women rightly refusing to take the test.

But in May 2024, a pregnant woman reported she actually drank the liquid, her blood sugar skyrocketed, she was vomiting, and she was in the midst of trying to bring her glucose level down with insulin on her own at home. She hadn’t objected to taking the test because “my ob.gyn. knows I have diabetes,” so she figured it was appropriate.

I don’t work in a healthcare setting, but here’s my guess: The ob.gyn. hadn’t actually ordered the test but had neglected to UN-order a routine test for a pregnant patient who already had diabetes and obviously should NOT be forced to drink a high-sugar liquid for no reason. If this is happening in pregnancies with type 1 diabetes, it most certainly could be as well for those with pre-existing type 2 diabetes. Clearly, something should be done to prevent this unnecessary and potentially harmful scenario.

In summary, I think I speak for everyone living with type 1 diabetes in saying that we would like to have confidence that healthcare providers in all settings can provide care for whatever brought us to them without adding to the daily burden we already carry. Let’s work together.

Reviewed by Saleh Aldasouqi, MD, chief of endocrinology at Michigan State University. A version of this article first appeared on Medscape.com.

At least 25% of unresponsive patients with a disorder of consciousness show signs of brain activity, an estimate that is higher than previous studies suggest.

“We found that at least 1 in 4 patients who are unresponsive to commands might actually be quite present and highly cognitive,” said study investigator Nicholas D. Schiff, MD, Feil Family Brain & Mind Research Institute and Department of Neurology, Weill Cornell Medicine, Rockefeller University Hospital, New York.

“In other words, if you go to the bedside and carefully examine someone with a severe brain injury and find no evidence of responsiveness, no one has been able to give you an a priori number to say how likely you are to be wrong in thinking this person is actually unaware, not processing language, and not capable of high-level cognitive work. And the answer to that now is at least 1 in 4 times.”

The findings were published online in The New England Journal of Medicine.
 

Clinical Implications? 

Cognitive motor dissociation (CMD) is a condition whereby patients with a severe brain injury who are unresponsive to commands at the bedside show brain activity on functional MRI (fMRI) or electroencephalography (EEG) when presented with selective motor imagery commands, such as “imagine playing tennis,” or “ imagine opening and closing your hand.”

Previous research shows that CMD is present in 10%-20% of people with a disorder of consciousness, a rate similar to that in patients with acute or chronic brain injury.

Understanding that a patient who appears unconscious has signs of cognitive processing could change the way clinicians and family interact with such individuals. Unresponsive patients who are aware may eventually be able to harness emerging communication technologies such as brain-computer interfaces.

In addition, knowing an individual’s CMD status could aid in prognosis. “We know from one study that there’s a four times increased likelihood that patients will be independent in a year in their function if they have cognitive motor dissociation,” said Dr. Schiff.

Unlike most previous studies of CMD, which were conducted at single sites and had relatively small cohorts, this new study included 353 adults with a disorder of consciousness (mean age, 37.9 years; 64% male) at six multinational sites.

Participants were recruited using a variety of methods, including consecutive enrollment of critically ill patients in the intensive care unit and enrollment of those with chronic illness or injury who were in the postacute phase of brain injury.
 

Response to Commands

Study participants were at different stages of recovery from an acute brain injury that had occurred an average of 8 months before the study started.

To determine the presence or absence of an observable response to commands among participants, trained staff used the Coma Recovery Scale–Revised (CRS-R); scores on this instrument range from 0 to 23, and higher scores indicate better neurobehavioral function.

About 40% of individuals were diagnosed with coma or vegetative state, 29% with minimally conscious state–minus, and 22% with minimally conscious state–plus. In all, 10% had emerged from a minimally conscious state.

Researchers assessed response to timed and repeated commands using fMRI or EEG in participants without an observable response to verbal commands, including those with a behavioral diagnosis of coma, vegetative state, or minimally conscious state–minus, and in participants with an observable response to verbal commands.

Of the 353 study participants, 61% underwent at least one fMRI assessment and 74% at least one EEG assessment. Both fMRI and EEG were performed in 35% of participants.

Dr. Schiff explained the two assessment types provide slightly different information, in that they measuring different types of brain signals. He also noted that although “every medical center in the world” has EEG, many do not have fMRI.

The brain imaging assessments captured brain activity within the motor area of the frontal cortex when tasked with motor imagery.

Of the 241 participants deemed to be in a coma or vegetative state or minimally conscious state–minus on the basis of CRS-R score, 60 (25%) had a response to commands on task-based fMRI, task-based EEG, or both.

The percentage of participants with CMD varied across study sites, from 2% to 45%, but Dr. Schiff said the reason for this is unclear. 

The proportion of participants with CMD may have been even higher if all individuals had been assessed with both imaging techniques, he said.
 

Higher Rate of Awareness Than in Previous Research

The investigators noted that the percentage of participants with CMD in their study was up to 10 percentage points higher than in previous studies. This may be due to the multimodal approach that classified participants undergoing assessment with both fMRI and EEG on the basis of responses on either technique, they said. 

The median age was lower among participants with CMD than those without CMD (30.5 years vs 45.3 years).

Compared with participants without CMD, a higher percentage of those with such dissociation had brain trauma as an etiologic factor (65% vs 38%) and a diagnosis of minimally conscious state–minus on the CRS-R (53% vs 38%).

Among people with CMD, 18% were assessed with fMRI only, 22% with EEG only, and 60% with both fMRI and EEG.

Dr. Schiff noted that the use of both fMRI and EEG appears to be more sensitive in detecting brain activity during tasks compared with use of one of these techniques alone.

Of the 112 participants with a diagnosis of minimally conscious state–plus or who had emerged from the minimally conscious state, 38% had a response to commands on task-based fMRI, task-based EEG, or both. Among these participants, 23% were assessed with fMRI only, 19% with EEG only, and 58% with both fMRI and EEG.

Research shows “it’s very clear that people with severe brain injury continue to get better over time,” noted Dr. Schiff. “Every month and week matters, and so it probably is the case that a lot of these patients are picking up the level of recovery, and the later we go out to measure them, the more likely we are to find people who are CMD than not.”

These new results should prompt further study to explore whether detection of CMD can lead to improved outcomes, the investigators noted. “In addition, the standardization, validation, and simplification of task-based fMRI and EEG methods that are used to detect cognitive motor dissociation are needed to prompt widespread clinical integration of these techniques and investigation of the bioethical implications of the findings.”

All study participants with chronic brain injury had survived their initial illness or injury and had access to a research facility with advanced fMRI and EEG capabilities. “This survival bias may reflect greater cognitive reserve and resilience over time among the participants. As such, the results of our study may not be generalizable to the overall population of patients with cognitive motor dissociation,” the investigators wrote.

Another study limitation was that participating sites used heterogeneous strategies to acquire, analyze, and interpret data, which led to differences in the number, type, and ordering of the cognitive tasks assessed on fMRI and EEG.

“These differences, along with variations in recruitment strategies and participant characteristics, may have contributed to the unequal percentage of participants with cognitive motor dissociation observed at each site. Our findings may therefore not be generalizable across all centers,” the researchers wrote. 

Only a few academic medical centers have the specially trained personnel and techniques needed to assess patients for CMD — which, the researchers noted, limits the feasibility of performing these assessments in general practice.
 

Challenging Research

Commenting on the research, Aarti Sarwal, MD, professor of neurology and section chief, Neurocritical Care, Virginia Commonwealth University, Richmond, Virginia, noted that this was a “very challenging” study to perform, given that only a few academic centers are equipped to perform both fMRI and quantitative EEG analysis.

“In general, finding patients this far out, who have access to clinical, radiological, and electrophysiological testing and were provided good care enough to receive these, is a mammoth task in itself.” 

Dr. Sarwal said the study builds on efforts of the Curing Coma campaign , a clinical, scientific, and public health effort of the Neurocritical Care Society to tackle the concept of coma as a treatable medical entity.

“It continues to highlight the challenges of prognostication in acute brain injured patients by showing a higher presence of cognitive function than previously perceived,” she said.

Dr. Sarwal believes that the study’s largest impact is underscoring the need for more research into understanding the degree and quality of cognitive processing in patients with a disorder of consciousness. But it also underlines the need for a “healthy debate” on the cost/benefit analysis of pursuing such research, given the limited number of patients with access to resources. 

“This debate needs to include the caregivers and families outside the traditional realms of stakeholders overseeing the science.” 

Although communication with comatose patients is still “a ways away,” this research is “a step in the right direction,” said Dr. Sarwal. 

The study was funded by the James S. McDonnell Foundation and others. Dr. Schiff and Dr. Sarwal report no relevant financial disclosures.
 

A version of this article first appeared on Medscape.com.

At least 25% of unresponsive patients with a disorder of consciousness show signs of brain activity, an estimate that is higher than previous studies suggest.

“We found that at least 1 in 4 patients who are unresponsive to commands might actually be quite present and highly cognitive,” said study investigator Nicholas D. Schiff, MD, Feil Family Brain & Mind Research Institute and Department of Neurology, Weill Cornell Medicine, Rockefeller University Hospital, New York.

“In other words, if you go to the bedside and carefully examine someone with a severe brain injury and find no evidence of responsiveness, no one has been able to give you an a priori number to say how likely you are to be wrong in thinking this person is actually unaware, not processing language, and not capable of high-level cognitive work. And the answer to that now is at least 1 in 4 times.”

The findings were published online in The New England Journal of Medicine.
 

Clinical Implications? 

Cognitive motor dissociation (CMD) is a condition whereby patients with a severe brain injury who are unresponsive to commands at the bedside show brain activity on functional MRI (fMRI) or electroencephalography (EEG) when presented with selective motor imagery commands, such as “imagine playing tennis,” or “ imagine opening and closing your hand.”

Previous research shows that CMD is present in 10%-20% of people with a disorder of consciousness, a rate similar to that in patients with acute or chronic brain injury.

Understanding that a patient who appears unconscious has signs of cognitive processing could change the way clinicians and family interact with such individuals. Unresponsive patients who are aware may eventually be able to harness emerging communication technologies such as brain-computer interfaces.

In addition, knowing an individual’s CMD status could aid in prognosis. “We know from one study that there’s a four times increased likelihood that patients will be independent in a year in their function if they have cognitive motor dissociation,” said Dr. Schiff.

Unlike most previous studies of CMD, which were conducted at single sites and had relatively small cohorts, this new study included 353 adults with a disorder of consciousness (mean age, 37.9 years; 64% male) at six multinational sites.

Participants were recruited using a variety of methods, including consecutive enrollment of critically ill patients in the intensive care unit and enrollment of those with chronic illness or injury who were in the postacute phase of brain injury.
 

Response to Commands

Study participants were at different stages of recovery from an acute brain injury that had occurred an average of 8 months before the study started.

To determine the presence or absence of an observable response to commands among participants, trained staff used the Coma Recovery Scale–Revised (CRS-R); scores on this instrument range from 0 to 23, and higher scores indicate better neurobehavioral function.

About 40% of individuals were diagnosed with coma or vegetative state, 29% with minimally conscious state–minus, and 22% with minimally conscious state–plus. In all, 10% had emerged from a minimally conscious state.

Researchers assessed response to timed and repeated commands using fMRI or EEG in participants without an observable response to verbal commands, including those with a behavioral diagnosis of coma, vegetative state, or minimally conscious state–minus, and in participants with an observable response to verbal commands.

Of the 353 study participants, 61% underwent at least one fMRI assessment and 74% at least one EEG assessment. Both fMRI and EEG were performed in 35% of participants.

Dr. Schiff explained the two assessment types provide slightly different information, in that they measuring different types of brain signals. He also noted that although “every medical center in the world” has EEG, many do not have fMRI.

The brain imaging assessments captured brain activity within the motor area of the frontal cortex when tasked with motor imagery.

Of the 241 participants deemed to be in a coma or vegetative state or minimally conscious state–minus on the basis of CRS-R score, 60 (25%) had a response to commands on task-based fMRI, task-based EEG, or both.

The percentage of participants with CMD varied across study sites, from 2% to 45%, but Dr. Schiff said the reason for this is unclear. 

The proportion of participants with CMD may have been even higher if all individuals had been assessed with both imaging techniques, he said.
 

Higher Rate of Awareness Than in Previous Research

The investigators noted that the percentage of participants with CMD in their study was up to 10 percentage points higher than in previous studies. This may be due to the multimodal approach that classified participants undergoing assessment with both fMRI and EEG on the basis of responses on either technique, they said. 

The median age was lower among participants with CMD than those without CMD (30.5 years vs 45.3 years).

Compared with participants without CMD, a higher percentage of those with such dissociation had brain trauma as an etiologic factor (65% vs 38%) and a diagnosis of minimally conscious state–minus on the CRS-R (53% vs 38%).

Among people with CMD, 18% were assessed with fMRI only, 22% with EEG only, and 60% with both fMRI and EEG.

Dr. Schiff noted that the use of both fMRI and EEG appears to be more sensitive in detecting brain activity during tasks compared with use of one of these techniques alone.

Of the 112 participants with a diagnosis of minimally conscious state–plus or who had emerged from the minimally conscious state, 38% had a response to commands on task-based fMRI, task-based EEG, or both. Among these participants, 23% were assessed with fMRI only, 19% with EEG only, and 58% with both fMRI and EEG.

Research shows “it’s very clear that people with severe brain injury continue to get better over time,” noted Dr. Schiff. “Every month and week matters, and so it probably is the case that a lot of these patients are picking up the level of recovery, and the later we go out to measure them, the more likely we are to find people who are CMD than not.”

These new results should prompt further study to explore whether detection of CMD can lead to improved outcomes, the investigators noted. “In addition, the standardization, validation, and simplification of task-based fMRI and EEG methods that are used to detect cognitive motor dissociation are needed to prompt widespread clinical integration of these techniques and investigation of the bioethical implications of the findings.”

All study participants with chronic brain injury had survived their initial illness or injury and had access to a research facility with advanced fMRI and EEG capabilities. “This survival bias may reflect greater cognitive reserve and resilience over time among the participants. As such, the results of our study may not be generalizable to the overall population of patients with cognitive motor dissociation,” the investigators wrote.

Another study limitation was that participating sites used heterogeneous strategies to acquire, analyze, and interpret data, which led to differences in the number, type, and ordering of the cognitive tasks assessed on fMRI and EEG.

“These differences, along with variations in recruitment strategies and participant characteristics, may have contributed to the unequal percentage of participants with cognitive motor dissociation observed at each site. Our findings may therefore not be generalizable across all centers,” the researchers wrote. 

Only a few academic medical centers have the specially trained personnel and techniques needed to assess patients for CMD — which, the researchers noted, limits the feasibility of performing these assessments in general practice.
 

Challenging Research

Commenting on the research, Aarti Sarwal, MD, professor of neurology and section chief, Neurocritical Care, Virginia Commonwealth University, Richmond, Virginia, noted that this was a “very challenging” study to perform, given that only a few academic centers are equipped to perform both fMRI and quantitative EEG analysis.

“In general, finding patients this far out, who have access to clinical, radiological, and electrophysiological testing and were provided good care enough to receive these, is a mammoth task in itself.” 

Dr. Sarwal said the study builds on efforts of the Curing Coma campaign , a clinical, scientific, and public health effort of the Neurocritical Care Society to tackle the concept of coma as a treatable medical entity.

“It continues to highlight the challenges of prognostication in acute brain injured patients by showing a higher presence of cognitive function than previously perceived,” she said.

Dr. Sarwal believes that the study’s largest impact is underscoring the need for more research into understanding the degree and quality of cognitive processing in patients with a disorder of consciousness. But it also underlines the need for a “healthy debate” on the cost/benefit analysis of pursuing such research, given the limited number of patients with access to resources. 

“This debate needs to include the caregivers and families outside the traditional realms of stakeholders overseeing the science.” 

Although communication with comatose patients is still “a ways away,” this research is “a step in the right direction,” said Dr. Sarwal. 

The study was funded by the James S. McDonnell Foundation and others. Dr. Schiff and Dr. Sarwal report no relevant financial disclosures.
 

A version of this article first appeared on Medscape.com.

At least 25% of unresponsive patients with a disorder of consciousness show signs of brain activity, an estimate that is higher than previous studies suggest.

“We found that at least 1 in 4 patients who are unresponsive to commands might actually be quite present and highly cognitive,” said study investigator Nicholas D. Schiff, MD, Feil Family Brain & Mind Research Institute and Department of Neurology, Weill Cornell Medicine, Rockefeller University Hospital, New York.

“In other words, if you go to the bedside and carefully examine someone with a severe brain injury and find no evidence of responsiveness, no one has been able to give you an a priori number to say how likely you are to be wrong in thinking this person is actually unaware, not processing language, and not capable of high-level cognitive work. And the answer to that now is at least 1 in 4 times.”

The findings were published online in The New England Journal of Medicine.
 

Clinical Implications? 

Cognitive motor dissociation (CMD) is a condition whereby patients with a severe brain injury who are unresponsive to commands at the bedside show brain activity on functional MRI (fMRI) or electroencephalography (EEG) when presented with selective motor imagery commands, such as “imagine playing tennis,” or “ imagine opening and closing your hand.”

Previous research shows that CMD is present in 10%-20% of people with a disorder of consciousness, a rate similar to that in patients with acute or chronic brain injury.

Understanding that a patient who appears unconscious has signs of cognitive processing could change the way clinicians and family interact with such individuals. Unresponsive patients who are aware may eventually be able to harness emerging communication technologies such as brain-computer interfaces.

In addition, knowing an individual’s CMD status could aid in prognosis. “We know from one study that there’s a four times increased likelihood that patients will be independent in a year in their function if they have cognitive motor dissociation,” said Dr. Schiff.

Unlike most previous studies of CMD, which were conducted at single sites and had relatively small cohorts, this new study included 353 adults with a disorder of consciousness (mean age, 37.9 years; 64% male) at six multinational sites.

Participants were recruited using a variety of methods, including consecutive enrollment of critically ill patients in the intensive care unit and enrollment of those with chronic illness or injury who were in the postacute phase of brain injury.
 

Response to Commands

Study participants were at different stages of recovery from an acute brain injury that had occurred an average of 8 months before the study started.

To determine the presence or absence of an observable response to commands among participants, trained staff used the Coma Recovery Scale–Revised (CRS-R); scores on this instrument range from 0 to 23, and higher scores indicate better neurobehavioral function.

About 40% of individuals were diagnosed with coma or vegetative state, 29% with minimally conscious state–minus, and 22% with minimally conscious state–plus. In all, 10% had emerged from a minimally conscious state.

Researchers assessed response to timed and repeated commands using fMRI or EEG in participants without an observable response to verbal commands, including those with a behavioral diagnosis of coma, vegetative state, or minimally conscious state–minus, and in participants with an observable response to verbal commands.

Of the 353 study participants, 61% underwent at least one fMRI assessment and 74% at least one EEG assessment. Both fMRI and EEG were performed in 35% of participants.

Dr. Schiff explained the two assessment types provide slightly different information, in that they measuring different types of brain signals. He also noted that although “every medical center in the world” has EEG, many do not have fMRI.

The brain imaging assessments captured brain activity within the motor area of the frontal cortex when tasked with motor imagery.

Of the 241 participants deemed to be in a coma or vegetative state or minimally conscious state–minus on the basis of CRS-R score, 60 (25%) had a response to commands on task-based fMRI, task-based EEG, or both.

The percentage of participants with CMD varied across study sites, from 2% to 45%, but Dr. Schiff said the reason for this is unclear. 

The proportion of participants with CMD may have been even higher if all individuals had been assessed with both imaging techniques, he said.
 

Higher Rate of Awareness Than in Previous Research

The investigators noted that the percentage of participants with CMD in their study was up to 10 percentage points higher than in previous studies. This may be due to the multimodal approach that classified participants undergoing assessment with both fMRI and EEG on the basis of responses on either technique, they said. 

The median age was lower among participants with CMD than those without CMD (30.5 years vs 45.3 years).

Compared with participants without CMD, a higher percentage of those with such dissociation had brain trauma as an etiologic factor (65% vs 38%) and a diagnosis of minimally conscious state–minus on the CRS-R (53% vs 38%).

Among people with CMD, 18% were assessed with fMRI only, 22% with EEG only, and 60% with both fMRI and EEG.

Dr. Schiff noted that the use of both fMRI and EEG appears to be more sensitive in detecting brain activity during tasks compared with use of one of these techniques alone.

Of the 112 participants with a diagnosis of minimally conscious state–plus or who had emerged from the minimally conscious state, 38% had a response to commands on task-based fMRI, task-based EEG, or both. Among these participants, 23% were assessed with fMRI only, 19% with EEG only, and 58% with both fMRI and EEG.

Research shows “it’s very clear that people with severe brain injury continue to get better over time,” noted Dr. Schiff. “Every month and week matters, and so it probably is the case that a lot of these patients are picking up the level of recovery, and the later we go out to measure them, the more likely we are to find people who are CMD than not.”

These new results should prompt further study to explore whether detection of CMD can lead to improved outcomes, the investigators noted. “In addition, the standardization, validation, and simplification of task-based fMRI and EEG methods that are used to detect cognitive motor dissociation are needed to prompt widespread clinical integration of these techniques and investigation of the bioethical implications of the findings.”

All study participants with chronic brain injury had survived their initial illness or injury and had access to a research facility with advanced fMRI and EEG capabilities. “This survival bias may reflect greater cognitive reserve and resilience over time among the participants. As such, the results of our study may not be generalizable to the overall population of patients with cognitive motor dissociation,” the investigators wrote.

Another study limitation was that participating sites used heterogeneous strategies to acquire, analyze, and interpret data, which led to differences in the number, type, and ordering of the cognitive tasks assessed on fMRI and EEG.

“These differences, along with variations in recruitment strategies and participant characteristics, may have contributed to the unequal percentage of participants with cognitive motor dissociation observed at each site. Our findings may therefore not be generalizable across all centers,” the researchers wrote. 

Only a few academic medical centers have the specially trained personnel and techniques needed to assess patients for CMD — which, the researchers noted, limits the feasibility of performing these assessments in general practice.
 

Challenging Research

Commenting on the research, Aarti Sarwal, MD, professor of neurology and section chief, Neurocritical Care, Virginia Commonwealth University, Richmond, Virginia, noted that this was a “very challenging” study to perform, given that only a few academic centers are equipped to perform both fMRI and quantitative EEG analysis.

“In general, finding patients this far out, who have access to clinical, radiological, and electrophysiological testing and were provided good care enough to receive these, is a mammoth task in itself.” 

Dr. Sarwal said the study builds on efforts of the Curing Coma campaign , a clinical, scientific, and public health effort of the Neurocritical Care Society to tackle the concept of coma as a treatable medical entity.

“It continues to highlight the challenges of prognostication in acute brain injured patients by showing a higher presence of cognitive function than previously perceived,” she said.

Dr. Sarwal believes that the study’s largest impact is underscoring the need for more research into understanding the degree and quality of cognitive processing in patients with a disorder of consciousness. But it also underlines the need for a “healthy debate” on the cost/benefit analysis of pursuing such research, given the limited number of patients with access to resources. 

“This debate needs to include the caregivers and families outside the traditional realms of stakeholders overseeing the science.” 

Although communication with comatose patients is still “a ways away,” this research is “a step in the right direction,” said Dr. Sarwal. 

The study was funded by the James S. McDonnell Foundation and others. Dr. Schiff and Dr. Sarwal report no relevant financial disclosures.
 

A version of this article first appeared on Medscape.com.

Proton pump inhibitor (PPI) prophylaxis in patients undergoing mechanical ventilation can prevent upper gastrointestinal (GI) bleeding and appears to have no effect on mortality, according to a randomized trial and a systematic review led by researchers at McMaster University, Hamilton, Ontario, Canada.

Patients in the intensive care unit (ICU) who need mechanical ventilation typically are given a PPI, such as pantoprazole, to prevent upper GI bleeding caused by stress-induced stomach ulcers, but some evidence suggested that their use might increase the risk for pneumonia and death in the most severely ill patients.

As a result, recent guidelines have issued only weak recommendations for stress ulcer prophylaxis, especially with PPIs, in critically ill patients at a high risk for bleeding, Deborah Cook, MD, professor of medicine at McMaster University, and colleagues noted.

Significantly Lower Bleeding Risk

The REVISE trial, conducted in eight countries, compared pantoprazole 40 mg daily with placebo in critically ill adults on mechanical ventilation.

The primary efficacy outcome was clinically important upper GI bleeding in the ICU at 90 days, and the primary safety outcome was death from any cause at 90 days.

A total of 4821 patients in 68 ICUs were randomly assigned to the pantoprazole group or placebo group.

Clinically important upper GI bleeding occurred in 25 patients (1%) receiving pantoprazole and in 84 patients (3.5%) receiving placebo. At 90 days, 696 patients (29.1%) in the pantoprazole group died, as did 734 (30.9%) in the placebo group.

No significant differences were found on key secondary outcomes, including ventilator-associated pneumonia and Clostridioides difficile infection in the hospital.

The authors concluded that pantoprazole resulted in a significantly lower risk for clinically important upper GI bleeding than placebo, and it had no significant effect on mortality.
 

Disease Severity as a Possible Factor

The systematic review included 12 randomized controlled trials comparing PPIs with placebo or no prophylaxis for stress ulcers in a total of 9533 critically ill adults. The researchers performed meta-analyses and assessed the certainty of the evidence. They also conducted a subgroup analysis combining within-trial subgroup data from the two largest trials.

They found that PPIs were associated with a reduced incidence of clinically important upper GI bleeding (relative risk [RR], 0.51, with high certainty evidence) and may have little or no effect on mortality (RR, 0.99, with low-certainty evidence).

However, the within-trial subgroup analysis with intermediate credibility suggested that the effect of PPIs on mortality may differ based on disease severity. The results also raised the possibility that PPI use may decrease 90-day mortality in less severely ill patients (RR, 0.89) and increase mortality in more severely ill patients (RR, 1.08). The mechanisms behind this possible signal are likely multifactorial, the authors noted.

In addition, the review found that PPIs may have no effect on pneumonia, duration of ICU stay, or duration of hospital stay, and little or no effect on C difficile infection or duration of mechanical ventilation (low-certainty evidence).

“Physicians, nurses, and pharmacists working in the ICU setting will use this information in practice right away, and the trial results and the updated meta-analysis will be incorporated into international practice guidelines,” Dr. Cook said.

Both studies had limitations. The REVISE trial did not include patient-reported disability outcomes, and the results may not be generalizable to patients with unassisted breathing. The systematic review included studies with diverse definitions of bleeding and pneumonia, and with mortality reported at different milestones, without considering competing risk analyses. Patient-important GI bleeding was available in only one trial. Other potential side effects of PPIs, such as infection with multidrug-resistant organisms, were not reported.

In an editorial accompanying both studies, Samuel M. Brown, MD, a pulmonologist and vice president of research at Intermountain Health, Salt Lake City, Utah, said that the REVISE trial was “well designed and executed, with generalizable eligibility criteria and excellent experimental separation.” He said the researchers had shown that PPIs “slightly but significantly” decrease the risk of important GI bleeding and have a “decent chance” of slightly decreasing mortality in less severely ill patients during mechanical ventilation. At the same time, he noted, PPIs “do not decrease — and may slightly increase — mortality” in severely ill patients.

A version of this article first appeared on Medscape.com.

Proton pump inhibitor (PPI) prophylaxis in patients undergoing mechanical ventilation can prevent upper gastrointestinal (GI) bleeding and appears to have no effect on mortality, according to a randomized trial and a systematic review led by researchers at McMaster University, Hamilton, Ontario, Canada.

Patients in the intensive care unit (ICU) who need mechanical ventilation typically are given a PPI, such as pantoprazole, to prevent upper GI bleeding caused by stress-induced stomach ulcers, but some evidence suggested that their use might increase the risk for pneumonia and death in the most severely ill patients.

As a result, recent guidelines have issued only weak recommendations for stress ulcer prophylaxis, especially with PPIs, in critically ill patients at a high risk for bleeding, Deborah Cook, MD, professor of medicine at McMaster University, and colleagues noted.

Significantly Lower Bleeding Risk

The REVISE trial, conducted in eight countries, compared pantoprazole 40 mg daily with placebo in critically ill adults on mechanical ventilation.

The primary efficacy outcome was clinically important upper GI bleeding in the ICU at 90 days, and the primary safety outcome was death from any cause at 90 days.

A total of 4821 patients in 68 ICUs were randomly assigned to the pantoprazole group or placebo group.

Clinically important upper GI bleeding occurred in 25 patients (1%) receiving pantoprazole and in 84 patients (3.5%) receiving placebo. At 90 days, 696 patients (29.1%) in the pantoprazole group died, as did 734 (30.9%) in the placebo group.

No significant differences were found on key secondary outcomes, including ventilator-associated pneumonia and Clostridioides difficile infection in the hospital.

The authors concluded that pantoprazole resulted in a significantly lower risk for clinically important upper GI bleeding than placebo, and it had no significant effect on mortality.
 

Disease Severity as a Possible Factor

The systematic review included 12 randomized controlled trials comparing PPIs with placebo or no prophylaxis for stress ulcers in a total of 9533 critically ill adults. The researchers performed meta-analyses and assessed the certainty of the evidence. They also conducted a subgroup analysis combining within-trial subgroup data from the two largest trials.

They found that PPIs were associated with a reduced incidence of clinically important upper GI bleeding (relative risk [RR], 0.51, with high certainty evidence) and may have little or no effect on mortality (RR, 0.99, with low-certainty evidence).

However, the within-trial subgroup analysis with intermediate credibility suggested that the effect of PPIs on mortality may differ based on disease severity. The results also raised the possibility that PPI use may decrease 90-day mortality in less severely ill patients (RR, 0.89) and increase mortality in more severely ill patients (RR, 1.08). The mechanisms behind this possible signal are likely multifactorial, the authors noted.

In addition, the review found that PPIs may have no effect on pneumonia, duration of ICU stay, or duration of hospital stay, and little or no effect on C difficile infection or duration of mechanical ventilation (low-certainty evidence).

“Physicians, nurses, and pharmacists working in the ICU setting will use this information in practice right away, and the trial results and the updated meta-analysis will be incorporated into international practice guidelines,” Dr. Cook said.

Both studies had limitations. The REVISE trial did not include patient-reported disability outcomes, and the results may not be generalizable to patients with unassisted breathing. The systematic review included studies with diverse definitions of bleeding and pneumonia, and with mortality reported at different milestones, without considering competing risk analyses. Patient-important GI bleeding was available in only one trial. Other potential side effects of PPIs, such as infection with multidrug-resistant organisms, were not reported.

In an editorial accompanying both studies, Samuel M. Brown, MD, a pulmonologist and vice president of research at Intermountain Health, Salt Lake City, Utah, said that the REVISE trial was “well designed and executed, with generalizable eligibility criteria and excellent experimental separation.” He said the researchers had shown that PPIs “slightly but significantly” decrease the risk of important GI bleeding and have a “decent chance” of slightly decreasing mortality in less severely ill patients during mechanical ventilation. At the same time, he noted, PPIs “do not decrease — and may slightly increase — mortality” in severely ill patients.

A version of this article first appeared on Medscape.com.

Proton pump inhibitor (PPI) prophylaxis in patients undergoing mechanical ventilation can prevent upper gastrointestinal (GI) bleeding and appears to have no effect on mortality, according to a randomized trial and a systematic review led by researchers at McMaster University, Hamilton, Ontario, Canada.

Patients in the intensive care unit (ICU) who need mechanical ventilation typically are given a PPI, such as pantoprazole, to prevent upper GI bleeding caused by stress-induced stomach ulcers, but some evidence suggested that their use might increase the risk for pneumonia and death in the most severely ill patients.

As a result, recent guidelines have issued only weak recommendations for stress ulcer prophylaxis, especially with PPIs, in critically ill patients at a high risk for bleeding, Deborah Cook, MD, professor of medicine at McMaster University, and colleagues noted.

Significantly Lower Bleeding Risk

The REVISE trial, conducted in eight countries, compared pantoprazole 40 mg daily with placebo in critically ill adults on mechanical ventilation.

The primary efficacy outcome was clinically important upper GI bleeding in the ICU at 90 days, and the primary safety outcome was death from any cause at 90 days.

A total of 4821 patients in 68 ICUs were randomly assigned to the pantoprazole group or placebo group.

Clinically important upper GI bleeding occurred in 25 patients (1%) receiving pantoprazole and in 84 patients (3.5%) receiving placebo. At 90 days, 696 patients (29.1%) in the pantoprazole group died, as did 734 (30.9%) in the placebo group.

No significant differences were found on key secondary outcomes, including ventilator-associated pneumonia and Clostridioides difficile infection in the hospital.

The authors concluded that pantoprazole resulted in a significantly lower risk for clinically important upper GI bleeding than placebo, and it had no significant effect on mortality.
 

Disease Severity as a Possible Factor

The systematic review included 12 randomized controlled trials comparing PPIs with placebo or no prophylaxis for stress ulcers in a total of 9533 critically ill adults. The researchers performed meta-analyses and assessed the certainty of the evidence. They also conducted a subgroup analysis combining within-trial subgroup data from the two largest trials.

They found that PPIs were associated with a reduced incidence of clinically important upper GI bleeding (relative risk [RR], 0.51, with high certainty evidence) and may have little or no effect on mortality (RR, 0.99, with low-certainty evidence).

However, the within-trial subgroup analysis with intermediate credibility suggested that the effect of PPIs on mortality may differ based on disease severity. The results also raised the possibility that PPI use may decrease 90-day mortality in less severely ill patients (RR, 0.89) and increase mortality in more severely ill patients (RR, 1.08). The mechanisms behind this possible signal are likely multifactorial, the authors noted.

In addition, the review found that PPIs may have no effect on pneumonia, duration of ICU stay, or duration of hospital stay, and little or no effect on C difficile infection or duration of mechanical ventilation (low-certainty evidence).

“Physicians, nurses, and pharmacists working in the ICU setting will use this information in practice right away, and the trial results and the updated meta-analysis will be incorporated into international practice guidelines,” Dr. Cook said.

Both studies had limitations. The REVISE trial did not include patient-reported disability outcomes, and the results may not be generalizable to patients with unassisted breathing. The systematic review included studies with diverse definitions of bleeding and pneumonia, and with mortality reported at different milestones, without considering competing risk analyses. Patient-important GI bleeding was available in only one trial. Other potential side effects of PPIs, such as infection with multidrug-resistant organisms, were not reported.

In an editorial accompanying both studies, Samuel M. Brown, MD, a pulmonologist and vice president of research at Intermountain Health, Salt Lake City, Utah, said that the REVISE trial was “well designed and executed, with generalizable eligibility criteria and excellent experimental separation.” He said the researchers had shown that PPIs “slightly but significantly” decrease the risk of important GI bleeding and have a “decent chance” of slightly decreasing mortality in less severely ill patients during mechanical ventilation. At the same time, he noted, PPIs “do not decrease — and may slightly increase — mortality” in severely ill patients.

A version of this article first appeared on Medscape.com.

The drones are coming.

Starting in September, if someone in Clemmons, North Carolina, calls 911 to report a cardiac arrest, the first responder on the scene may be a drone carrying an automated external defibrillator, or AED.

“The idea is for the drone to get there several minutes before first responders,” such as an emergency medical technician or an ambulance, said Daniel Crews, a spokesperson for the sheriff’s office in Forsyth County, where Clemmons is located. The sheriff’s office is partnering on the project with local emergency services, the Clinical Research Institute at Duke University, and the drone consulting firm Hovecon. “The ultimate goal is to save lives and improve life expectancy for someone experiencing a cardiac episode,” Mr. Crews said.

The Forsyth County program is one of a growing number of efforts by public safety and healthcare organizations across the country to use drones to speed up lifesaving treatment in situations in which every second counts.

More than 356,000 people have a cardiac arrest outside of a hospital setting every year in the United States, according to the American Heart Association. Most people are at home when it happens, and about 90% die because they don’t get immediate help from first responders or bystanders. Every minute that passes without medical intervention decreases the odds of survival by 10%.

“We’ve never been able to move the needle for cardiac arrest in private settings, and this technology could meet that need,” said Monique Anderson Starks, MD, a cardiologist and associate professor of medicine at Duke University. Dr. Starks is leading pilot studies in Forsyth County and James City County, Virginia, to test whether drone AED delivery can improve treatment response times. The work is funded by a 4-year grant from the American Heart Association.

A 2017 study found it takes an emergency medical services unit 7 minutes, on average, to arrive on the scene following a 911 call, though response times vary considerably by region, and rural wait times can be much longer. Dr. Starks said she believes the drone-delivered AEDs in the pilot study could reduce the time to treatment by 4 minutes compared with first responders.

Unlike a heart attack, which occurs when blood flow to the heart is blocked, a cardiac arrest happens when a heart malfunction causes it to stop beating, typically because of an arrhythmia or an electrical problem. Eighty percent of cardiac arrests start as heart attacks. The only way to get the heart restarted is with CPR and a defibrillator.

In Forsyth County, a drone pilot from the sheriff’s department will listen in on 911 calls. If there’s a suspected cardiac arrest, the pilot can dispatch the drone even before emergency medical services are contacted. The drone, which weighs 22 pounds and can travel 60 mph, will fly to the location and hover 125 feet in the air before lowering an AED to the ground on a winch. The AED provides simple verbal instructions; the 911 dispatcher on the phone can also help a bystander use the AED.

Eventually there will be six drone bases in Forsyth and James City counties, Dr. Starks said.

While the technology is promising and research has often found that drones arrive faster than first responders, there’s little conclusive evidence that drones improve health outcomes.

A Swedish study published in The Lancet in 2023 compared the response times between drones and ambulances for suspected cardiac arrest in 58 deployments in an area of about 200,000 people. It found that drones beat the ambulance to the scene two thirds of the time, by a median of 3 minutes and 14 seconds.

In the United States, most programs are just getting started, and they are exploring the use of drones to also provide remedies for drug overdoses and major trauma or potential drowning rescues.

In Florida, Tampa General Hospital, Manatee County, and Archer First Response Systems, or AFRS, began a program in May to deliver AEDs, a tourniquet, and Narcan, a nasal spray that can reverse an opioid overdose. The program initially covers a 7-square-mile area, and EMS dispatchers deploy the drones, which are monitored by drone pilots.

There were nearly 108,000 drug overdose deaths in the United States in 2022, according to the National Institute on Drug Abuse.

As of early July, the Tampa program hadn’t yet deployed any drones, said Gordon Folkes, the founder and chief executive of AFRS, which develops and deploys emergency drone logistics systems. One request in June to send a drone to an overdose couldn’t be fulfilled because of a violent thunderstorm, Mr. Folkes said. In the testing area, which covers about 7,000 residents, Mr. Folkes estimates that 10-15 drones might be deployed each year.

“The bread and butter for these systems is suburban areas” like Manatee County that are well-populated and where the drones have the advantage of being able to avoid traffic congestion, Mr. Folkes said.

There are other uses for drones in medical emergencies. The New York Police Department plans to drop emergency flotation devices to struggling swimmers at local beaches. In Chula Vista, California, a police drone was able to pinpoint the location of a burning car, and then officers pulled the driver out, said Sgt. Tony Molina.

Rescue personnel have used drones to locate people who wander away from nursing homes, said James Augustine, a spokesperson for the American College of Emergency Physicians who is the medical director for the International Association of Fire Chiefs.

In the United States, one hurdle for drone programs is that the Federal Aviation Administration typically requires that drones be operated within the operators’ visual line of sight. In May, when Congress passed the FAA reauthorization bill, it gave the FAA 4 months to issue a notice of proposed rule-making on drone operations beyond the visual line of sight.

“The FAA is focused on developing standard rules to make [Beyond Visual Line of Sight] operations routine, scalable, and economically viable,” said Rick Breitenfeldt, an FAA spokesperson.

Some civil liberties groups are concerned that the FAA’s new rules may not provide enough protection from drone cameras for people on the ground.

Jay Stanley, a senior policy analyst at the American Civil Liberties Union, acknowledged the benefits of using drones in emergency situations but said there are issues that need to be addressed.

“The concern is that the FAA is going to significantly loosen the reins of drones without any significant privacy protections,” he said.

KFF Health News is a national newsroom that produces in-depth journalism about health issues and is one of the core operating programs at KFF — the independent source for health policy research, polling, and journalism.

The drones are coming.

Starting in September, if someone in Clemmons, North Carolina, calls 911 to report a cardiac arrest, the first responder on the scene may be a drone carrying an automated external defibrillator, or AED.

“The idea is for the drone to get there several minutes before first responders,” such as an emergency medical technician or an ambulance, said Daniel Crews, a spokesperson for the sheriff’s office in Forsyth County, where Clemmons is located. The sheriff’s office is partnering on the project with local emergency services, the Clinical Research Institute at Duke University, and the drone consulting firm Hovecon. “The ultimate goal is to save lives and improve life expectancy for someone experiencing a cardiac episode,” Mr. Crews said.

The Forsyth County program is one of a growing number of efforts by public safety and healthcare organizations across the country to use drones to speed up lifesaving treatment in situations in which every second counts.

More than 356,000 people have a cardiac arrest outside of a hospital setting every year in the United States, according to the American Heart Association. Most people are at home when it happens, and about 90% die because they don’t get immediate help from first responders or bystanders. Every minute that passes without medical intervention decreases the odds of survival by 10%.

“We’ve never been able to move the needle for cardiac arrest in private settings, and this technology could meet that need,” said Monique Anderson Starks, MD, a cardiologist and associate professor of medicine at Duke University. Dr. Starks is leading pilot studies in Forsyth County and James City County, Virginia, to test whether drone AED delivery can improve treatment response times. The work is funded by a 4-year grant from the American Heart Association.

A 2017 study found it takes an emergency medical services unit 7 minutes, on average, to arrive on the scene following a 911 call, though response times vary considerably by region, and rural wait times can be much longer. Dr. Starks said she believes the drone-delivered AEDs in the pilot study could reduce the time to treatment by 4 minutes compared with first responders.

Unlike a heart attack, which occurs when blood flow to the heart is blocked, a cardiac arrest happens when a heart malfunction causes it to stop beating, typically because of an arrhythmia or an electrical problem. Eighty percent of cardiac arrests start as heart attacks. The only way to get the heart restarted is with CPR and a defibrillator.

In Forsyth County, a drone pilot from the sheriff’s department will listen in on 911 calls. If there’s a suspected cardiac arrest, the pilot can dispatch the drone even before emergency medical services are contacted. The drone, which weighs 22 pounds and can travel 60 mph, will fly to the location and hover 125 feet in the air before lowering an AED to the ground on a winch. The AED provides simple verbal instructions; the 911 dispatcher on the phone can also help a bystander use the AED.

Eventually there will be six drone bases in Forsyth and James City counties, Dr. Starks said.

While the technology is promising and research has often found that drones arrive faster than first responders, there’s little conclusive evidence that drones improve health outcomes.

A Swedish study published in The Lancet in 2023 compared the response times between drones and ambulances for suspected cardiac arrest in 58 deployments in an area of about 200,000 people. It found that drones beat the ambulance to the scene two thirds of the time, by a median of 3 minutes and 14 seconds.

In the United States, most programs are just getting started, and they are exploring the use of drones to also provide remedies for drug overdoses and major trauma or potential drowning rescues.

In Florida, Tampa General Hospital, Manatee County, and Archer First Response Systems, or AFRS, began a program in May to deliver AEDs, a tourniquet, and Narcan, a nasal spray that can reverse an opioid overdose. The program initially covers a 7-square-mile area, and EMS dispatchers deploy the drones, which are monitored by drone pilots.

There were nearly 108,000 drug overdose deaths in the United States in 2022, according to the National Institute on Drug Abuse.

As of early July, the Tampa program hadn’t yet deployed any drones, said Gordon Folkes, the founder and chief executive of AFRS, which develops and deploys emergency drone logistics systems. One request in June to send a drone to an overdose couldn’t be fulfilled because of a violent thunderstorm, Mr. Folkes said. In the testing area, which covers about 7,000 residents, Mr. Folkes estimates that 10-15 drones might be deployed each year.

“The bread and butter for these systems is suburban areas” like Manatee County that are well-populated and where the drones have the advantage of being able to avoid traffic congestion, Mr. Folkes said.

There are other uses for drones in medical emergencies. The New York Police Department plans to drop emergency flotation devices to struggling swimmers at local beaches. In Chula Vista, California, a police drone was able to pinpoint the location of a burning car, and then officers pulled the driver out, said Sgt. Tony Molina.

Rescue personnel have used drones to locate people who wander away from nursing homes, said James Augustine, a spokesperson for the American College of Emergency Physicians who is the medical director for the International Association of Fire Chiefs.

In the United States, one hurdle for drone programs is that the Federal Aviation Administration typically requires that drones be operated within the operators’ visual line of sight. In May, when Congress passed the FAA reauthorization bill, it gave the FAA 4 months to issue a notice of proposed rule-making on drone operations beyond the visual line of sight.

“The FAA is focused on developing standard rules to make [Beyond Visual Line of Sight] operations routine, scalable, and economically viable,” said Rick Breitenfeldt, an FAA spokesperson.

Some civil liberties groups are concerned that the FAA’s new rules may not provide enough protection from drone cameras for people on the ground.

Jay Stanley, a senior policy analyst at the American Civil Liberties Union, acknowledged the benefits of using drones in emergency situations but said there are issues that need to be addressed.

“The concern is that the FAA is going to significantly loosen the reins of drones without any significant privacy protections,” he said.

KFF Health News is a national newsroom that produces in-depth journalism about health issues and is one of the core operating programs at KFF — the independent source for health policy research, polling, and journalism.

The drones are coming.

Starting in September, if someone in Clemmons, North Carolina, calls 911 to report a cardiac arrest, the first responder on the scene may be a drone carrying an automated external defibrillator, or AED.

“The idea is for the drone to get there several minutes before first responders,” such as an emergency medical technician or an ambulance, said Daniel Crews, a spokesperson for the sheriff’s office in Forsyth County, where Clemmons is located. The sheriff’s office is partnering on the project with local emergency services, the Clinical Research Institute at Duke University, and the drone consulting firm Hovecon. “The ultimate goal is to save lives and improve life expectancy for someone experiencing a cardiac episode,” Mr. Crews said.

The Forsyth County program is one of a growing number of efforts by public safety and healthcare organizations across the country to use drones to speed up lifesaving treatment in situations in which every second counts.

More than 356,000 people have a cardiac arrest outside of a hospital setting every year in the United States, according to the American Heart Association. Most people are at home when it happens, and about 90% die because they don’t get immediate help from first responders or bystanders. Every minute that passes without medical intervention decreases the odds of survival by 10%.

“We’ve never been able to move the needle for cardiac arrest in private settings, and this technology could meet that need,” said Monique Anderson Starks, MD, a cardiologist and associate professor of medicine at Duke University. Dr. Starks is leading pilot studies in Forsyth County and James City County, Virginia, to test whether drone AED delivery can improve treatment response times. The work is funded by a 4-year grant from the American Heart Association.

A 2017 study found it takes an emergency medical services unit 7 minutes, on average, to arrive on the scene following a 911 call, though response times vary considerably by region, and rural wait times can be much longer. Dr. Starks said she believes the drone-delivered AEDs in the pilot study could reduce the time to treatment by 4 minutes compared with first responders.

Unlike a heart attack, which occurs when blood flow to the heart is blocked, a cardiac arrest happens when a heart malfunction causes it to stop beating, typically because of an arrhythmia or an electrical problem. Eighty percent of cardiac arrests start as heart attacks. The only way to get the heart restarted is with CPR and a defibrillator.

In Forsyth County, a drone pilot from the sheriff’s department will listen in on 911 calls. If there’s a suspected cardiac arrest, the pilot can dispatch the drone even before emergency medical services are contacted. The drone, which weighs 22 pounds and can travel 60 mph, will fly to the location and hover 125 feet in the air before lowering an AED to the ground on a winch. The AED provides simple verbal instructions; the 911 dispatcher on the phone can also help a bystander use the AED.

Eventually there will be six drone bases in Forsyth and James City counties, Dr. Starks said.

While the technology is promising and research has often found that drones arrive faster than first responders, there’s little conclusive evidence that drones improve health outcomes.

A Swedish study published in The Lancet in 2023 compared the response times between drones and ambulances for suspected cardiac arrest in 58 deployments in an area of about 200,000 people. It found that drones beat the ambulance to the scene two thirds of the time, by a median of 3 minutes and 14 seconds.

In the United States, most programs are just getting started, and they are exploring the use of drones to also provide remedies for drug overdoses and major trauma or potential drowning rescues.

In Florida, Tampa General Hospital, Manatee County, and Archer First Response Systems, or AFRS, began a program in May to deliver AEDs, a tourniquet, and Narcan, a nasal spray that can reverse an opioid overdose. The program initially covers a 7-square-mile area, and EMS dispatchers deploy the drones, which are monitored by drone pilots.

There were nearly 108,000 drug overdose deaths in the United States in 2022, according to the National Institute on Drug Abuse.

As of early July, the Tampa program hadn’t yet deployed any drones, said Gordon Folkes, the founder and chief executive of AFRS, which develops and deploys emergency drone logistics systems. One request in June to send a drone to an overdose couldn’t be fulfilled because of a violent thunderstorm, Mr. Folkes said. In the testing area, which covers about 7,000 residents, Mr. Folkes estimates that 10-15 drones might be deployed each year.

“The bread and butter for these systems is suburban areas” like Manatee County that are well-populated and where the drones have the advantage of being able to avoid traffic congestion, Mr. Folkes said.

There are other uses for drones in medical emergencies. The New York Police Department plans to drop emergency flotation devices to struggling swimmers at local beaches. In Chula Vista, California, a police drone was able to pinpoint the location of a burning car, and then officers pulled the driver out, said Sgt. Tony Molina.

Rescue personnel have used drones to locate people who wander away from nursing homes, said James Augustine, a spokesperson for the American College of Emergency Physicians who is the medical director for the International Association of Fire Chiefs.

In the United States, one hurdle for drone programs is that the Federal Aviation Administration typically requires that drones be operated within the operators’ visual line of sight. In May, when Congress passed the FAA reauthorization bill, it gave the FAA 4 months to issue a notice of proposed rule-making on drone operations beyond the visual line of sight.

“The FAA is focused on developing standard rules to make [Beyond Visual Line of Sight] operations routine, scalable, and economically viable,” said Rick Breitenfeldt, an FAA spokesperson.

Some civil liberties groups are concerned that the FAA’s new rules may not provide enough protection from drone cameras for people on the ground.

Jay Stanley, a senior policy analyst at the American Civil Liberties Union, acknowledged the benefits of using drones in emergency situations but said there are issues that need to be addressed.

“The concern is that the FAA is going to significantly loosen the reins of drones without any significant privacy protections,” he said.

KFF Health News is a national newsroom that produces in-depth journalism about health issues and is one of the core operating programs at KFF — the independent source for health policy research, polling, and journalism.

Intravenous albumin is a human-derived blood product studied widely in a variety of patient populations. Despite its frequent use in critical care, few high-quality studies have demonstrated improvements in patient-important outcomes. It is important for intensivists to think critically about prescribing albumin and individualize the prescription for each patient, as albumin use is not without risk. Compared with crystalloids, albumin increases the risk of fluid overload and bleeding and infections in patients undergoing cardiac surgery.^1,2 In addition, albumin is costly, and its production is fraught with donor supply chain ethical concerns (the majority of albumin is derived from paid plasma donors).

CHEST

Albumin use is highly variable between countries, hospitals, and even clinicians within the same specialty due to several factors, including the perception of minimal risk with albumin, concerns regarding insufficient short-term hemodynamic response to crystalloid, and lack of high-quality evidence to inform clinical practice. We will discuss when intensivists should consider albumin use (with prescription personalized to patient context) and when it should be avoided due to the concerns for patient harm.

An intensivist might consider albumin as a reasonable treatment option in patients with cirrhosis undergoing large volume paracentesis to prevent paracentesis-induced circulatory dysfunction, and in patients with cirrhosis and spontaneous bacterial peritonitis (SBP), as data suggests use in this setting leads to a reduction in mortality.³ Clinicians should be aware that even for these widely accepted albumin indications, which are supported by published guidelines, the certainty of evidence is low, recommendations are weak (conditional), and, therefore, albumin should always be personalized to the patient based on volume of paracentesis fluid removed, prior history of hypotension after procedures, and degree of renal dysfunction.⁴

CHEST

CHEST

As with any intervention, the use of albumin is associated with risks. In patients undergoing on-pump cardiac surgery, the ALBICS study showed that albumin did not reduce the risk of major adverse events and, instead, increased risk of bleeding, resternotomy, and infection.² The ATTIRE trial showed that in patients hospitalized with decompensated cirrhosis and serum albumin <30 g/L, albumin failed to reduce infection, renal impairment, or mortality while increasing life-threatening adverse events, including pulmonary edema and fluid overload.¹ Similarly, in patients with cirrhosis and extraperitoneal infections, albumin showed no benefit in reducing renal impairment or mortality, and its use was associated with higher rates of pulmonary edema.⁶ Lastly, critically ill patients with traumatic brain injury (TBI) who received fluid resuscitation with albumin have been shown to experience higher mortality compared with saline.⁷ Thus, based on current evidence, intravenous albumin is not recommended for patients undergoing cardiac surgery (priming of the bypass circuit or volume replacement), patients hospitalized with decompensated cirrhosis and hypoalbuminemia, patients hospitalized with cirrhosis and extraperitoneal infections, and critically ill patients with TBI.⁴

CHEST

CHEST

High-quality evidence is currently lacking in many clinical settings, and large randomized controlled trials are underway to provide further insights into the utility of albumin. These trials will address albumin use in the following: acute kidney injury requiring renal replacement therapy (ALTER-AKI, NCT04705896), inpatients with community-acquired pneumonia (NCT04071041), high-risk cardiac surgery (ACTRN1261900135516703), and septic shock (NCT03869385).

CHEST

Financial/nonfinancial disclosures

Nicole Relke: None. Mark Hewitt: None. Bram Rochwerg: None. Jeannie Callum: Research support from Canadian Blood Services and Octapharma.

References

1. China L, Freemantle N, Forrest E, et al. A randomized trial of albumin infusions in hospitalized patients with cirrhosis. N Engl J Med. 2021;384(9):808-817. doi:10.1056/NEJMoa2022166

2. Pesonen E, Vlasov H, Suojaranta R, et al. Effect of 4% albumin solution vs ringer acetate on major adverse events in patients undergoing cardiac surgery with cardiopulmonary bypass: a randomized clinical trial. JAMA. 2022;328(3):251-258. doi:10.1001/jama.2022.10461

3. Sort P, Navasa M, Arroyo V, et al. Effect of intravenous albumin on renal impairment and mortality in patients with cirrhosis and spontaneous bacterial peritonitis. NEJM. 1999;341:403-409.

4. Callum J, Skubas NJ, Bathla A, et al. Use of intravenous albumin: a guideline from the international collaboration for transfusion medicine guidelines. Chest. 2024:S0012-3692(24)00285-X. doi:10.1016/j.chest.2024.02.049

5. Torp N. High doses of albumin increases mortality and complications in terlipressin treated patients with cirrhosis: insights from the ATTIRE trial. Paper presented at the AASLD; 2023; San Diego, CA. https://www.aasld.org/the-liver-meeting/high-doses-albumin-increases-mortality-and-complications-terlipressin-treated

6. Wong YJ, Qiu TY, Tam YC, Mohan BP, Gallegos-Orozco JF, Adler DG. Efficacy and safety of IV albumin for non-spontaneous bacterial peritonitis infection among patients with cirrhosis: a systematic review and meta-analysis. Dig Liver Dis. 2020;52(10):1137-1142. doi:10.1016/j.dld.2020.05.047

7. Myburgh J, Cooper JD, Finfer S, et al. Saline or albumin for fluid resuscitation in patients with traumatic brain injury. N Engl J Med. 2007;357(9):874-884.

Intravenous albumin is a human-derived blood product studied widely in a variety of patient populations. Despite its frequent use in critical care, few high-quality studies have demonstrated improvements in patient-important outcomes. It is important for intensivists to think critically about prescribing albumin and individualize the prescription for each patient, as albumin use is not without risk. Compared with crystalloids, albumin increases the risk of fluid overload and bleeding and infections in patients undergoing cardiac surgery.^1,2 In addition, albumin is costly, and its production is fraught with donor supply chain ethical concerns (the majority of albumin is derived from paid plasma donors).

CHEST

Albumin use is highly variable between countries, hospitals, and even clinicians within the same specialty due to several factors, including the perception of minimal risk with albumin, concerns regarding insufficient short-term hemodynamic response to crystalloid, and lack of high-quality evidence to inform clinical practice. We will discuss when intensivists should consider albumin use (with prescription personalized to patient context) and when it should be avoided due to the concerns for patient harm.

An intensivist might consider albumin as a reasonable treatment option in patients with cirrhosis undergoing large volume paracentesis to prevent paracentesis-induced circulatory dysfunction, and in patients with cirrhosis and spontaneous bacterial peritonitis (SBP), as data suggests use in this setting leads to a reduction in mortality.³ Clinicians should be aware that even for these widely accepted albumin indications, which are supported by published guidelines, the certainty of evidence is low, recommendations are weak (conditional), and, therefore, albumin should always be personalized to the patient based on volume of paracentesis fluid removed, prior history of hypotension after procedures, and degree of renal dysfunction.⁴

CHEST

CHEST

As with any intervention, the use of albumin is associated with risks. In patients undergoing on-pump cardiac surgery, the ALBICS study showed that albumin did not reduce the risk of major adverse events and, instead, increased risk of bleeding, resternotomy, and infection.² The ATTIRE trial showed that in patients hospitalized with decompensated cirrhosis and serum albumin <30 g/L, albumin failed to reduce infection, renal impairment, or mortality while increasing life-threatening adverse events, including pulmonary edema and fluid overload.¹ Similarly, in patients with cirrhosis and extraperitoneal infections, albumin showed no benefit in reducing renal impairment or mortality, and its use was associated with higher rates of pulmonary edema.⁶ Lastly, critically ill patients with traumatic brain injury (TBI) who received fluid resuscitation with albumin have been shown to experience higher mortality compared with saline.⁷ Thus, based on current evidence, intravenous albumin is not recommended for patients undergoing cardiac surgery (priming of the bypass circuit or volume replacement), patients hospitalized with decompensated cirrhosis and hypoalbuminemia, patients hospitalized with cirrhosis and extraperitoneal infections, and critically ill patients with TBI.⁴

CHEST

CHEST

High-quality evidence is currently lacking in many clinical settings, and large randomized controlled trials are underway to provide further insights into the utility of albumin. These trials will address albumin use in the following: acute kidney injury requiring renal replacement therapy (ALTER-AKI, NCT04705896), inpatients with community-acquired pneumonia (NCT04071041), high-risk cardiac surgery (ACTRN1261900135516703), and septic shock (NCT03869385).

CHEST

Financial/nonfinancial disclosures

Nicole Relke: None. Mark Hewitt: None. Bram Rochwerg: None. Jeannie Callum: Research support from Canadian Blood Services and Octapharma.

References

1. China L, Freemantle N, Forrest E, et al. A randomized trial of albumin infusions in hospitalized patients with cirrhosis. N Engl J Med. 2021;384(9):808-817. doi:10.1056/NEJMoa2022166

2. Pesonen E, Vlasov H, Suojaranta R, et al. Effect of 4% albumin solution vs ringer acetate on major adverse events in patients undergoing cardiac surgery with cardiopulmonary bypass: a randomized clinical trial. JAMA. 2022;328(3):251-258. doi:10.1001/jama.2022.10461

3. Sort P, Navasa M, Arroyo V, et al. Effect of intravenous albumin on renal impairment and mortality in patients with cirrhosis and spontaneous bacterial peritonitis. NEJM. 1999;341:403-409.

4. Callum J, Skubas NJ, Bathla A, et al. Use of intravenous albumin: a guideline from the international collaboration for transfusion medicine guidelines. Chest. 2024:S0012-3692(24)00285-X. doi:10.1016/j.chest.2024.02.049

5. Torp N. High doses of albumin increases mortality and complications in terlipressin treated patients with cirrhosis: insights from the ATTIRE trial. Paper presented at the AASLD; 2023; San Diego, CA. https://www.aasld.org/the-liver-meeting/high-doses-albumin-increases-mortality-and-complications-terlipressin-treated

6. Wong YJ, Qiu TY, Tam YC, Mohan BP, Gallegos-Orozco JF, Adler DG. Efficacy and safety of IV albumin for non-spontaneous bacterial peritonitis infection among patients with cirrhosis: a systematic review and meta-analysis. Dig Liver Dis. 2020;52(10):1137-1142. doi:10.1016/j.dld.2020.05.047

7. Myburgh J, Cooper JD, Finfer S, et al. Saline or albumin for fluid resuscitation in patients with traumatic brain injury. N Engl J Med. 2007;357(9):874-884.

Intravenous albumin is a human-derived blood product studied widely in a variety of patient populations. Despite its frequent use in critical care, few high-quality studies have demonstrated improvements in patient-important outcomes. It is important for intensivists to think critically about prescribing albumin and individualize the prescription for each patient, as albumin use is not without risk. Compared with crystalloids, albumin increases the risk of fluid overload and bleeding and infections in patients undergoing cardiac surgery.^1,2 In addition, albumin is costly, and its production is fraught with donor supply chain ethical concerns (the majority of albumin is derived from paid plasma donors).

CHEST

Albumin use is highly variable between countries, hospitals, and even clinicians within the same specialty due to several factors, including the perception of minimal risk with albumin, concerns regarding insufficient short-term hemodynamic response to crystalloid, and lack of high-quality evidence to inform clinical practice. We will discuss when intensivists should consider albumin use (with prescription personalized to patient context) and when it should be avoided due to the concerns for patient harm.

An intensivist might consider albumin as a reasonable treatment option in patients with cirrhosis undergoing large volume paracentesis to prevent paracentesis-induced circulatory dysfunction, and in patients with cirrhosis and spontaneous bacterial peritonitis (SBP), as data suggests use in this setting leads to a reduction in mortality.³ Clinicians should be aware that even for these widely accepted albumin indications, which are supported by published guidelines, the certainty of evidence is low, recommendations are weak (conditional), and, therefore, albumin should always be personalized to the patient based on volume of paracentesis fluid removed, prior history of hypotension after procedures, and degree of renal dysfunction.⁴

CHEST

CHEST

As with any intervention, the use of albumin is associated with risks. In patients undergoing on-pump cardiac surgery, the ALBICS study showed that albumin did not reduce the risk of major adverse events and, instead, increased risk of bleeding, resternotomy, and infection.² The ATTIRE trial showed that in patients hospitalized with decompensated cirrhosis and serum albumin <30 g/L, albumin failed to reduce infection, renal impairment, or mortality while increasing life-threatening adverse events, including pulmonary edema and fluid overload.¹ Similarly, in patients with cirrhosis and extraperitoneal infections, albumin showed no benefit in reducing renal impairment or mortality, and its use was associated with higher rates of pulmonary edema.⁶ Lastly, critically ill patients with traumatic brain injury (TBI) who received fluid resuscitation with albumin have been shown to experience higher mortality compared with saline.⁷ Thus, based on current evidence, intravenous albumin is not recommended for patients undergoing cardiac surgery (priming of the bypass circuit or volume replacement), patients hospitalized with decompensated cirrhosis and hypoalbuminemia, patients hospitalized with cirrhosis and extraperitoneal infections, and critically ill patients with TBI.⁴

CHEST

CHEST

High-quality evidence is currently lacking in many clinical settings, and large randomized controlled trials are underway to provide further insights into the utility of albumin. These trials will address albumin use in the following: acute kidney injury requiring renal replacement therapy (ALTER-AKI, NCT04705896), inpatients with community-acquired pneumonia (NCT04071041), high-risk cardiac surgery (ACTRN1261900135516703), and septic shock (NCT03869385).

CHEST

Financial/nonfinancial disclosures

Nicole Relke: None. Mark Hewitt: None. Bram Rochwerg: None. Jeannie Callum: Research support from Canadian Blood Services and Octapharma.

References

1. China L, Freemantle N, Forrest E, et al. A randomized trial of albumin infusions in hospitalized patients with cirrhosis. N Engl J Med. 2021;384(9):808-817. doi:10.1056/NEJMoa2022166

2. Pesonen E, Vlasov H, Suojaranta R, et al. Effect of 4% albumin solution vs ringer acetate on major adverse events in patients undergoing cardiac surgery with cardiopulmonary bypass: a randomized clinical trial. JAMA. 2022;328(3):251-258. doi:10.1001/jama.2022.10461

3. Sort P, Navasa M, Arroyo V, et al. Effect of intravenous albumin on renal impairment and mortality in patients with cirrhosis and spontaneous bacterial peritonitis. NEJM. 1999;341:403-409.

4. Callum J, Skubas NJ, Bathla A, et al. Use of intravenous albumin: a guideline from the international collaboration for transfusion medicine guidelines. Chest. 2024:S0012-3692(24)00285-X. doi:10.1016/j.chest.2024.02.049

5. Torp N. High doses of albumin increases mortality and complications in terlipressin treated patients with cirrhosis: insights from the ATTIRE trial. Paper presented at the AASLD; 2023; San Diego, CA. https://www.aasld.org/the-liver-meeting/high-doses-albumin-increases-mortality-and-complications-terlipressin-treated

6. Wong YJ, Qiu TY, Tam YC, Mohan BP, Gallegos-Orozco JF, Adler DG. Efficacy and safety of IV albumin for non-spontaneous bacterial peritonitis infection among patients with cirrhosis: a systematic review and meta-analysis. Dig Liver Dis. 2020;52(10):1137-1142. doi:10.1016/j.dld.2020.05.047

7. Myburgh J, Cooper JD, Finfer S, et al. Saline or albumin for fluid resuscitation in patients with traumatic brain injury. N Engl J Med. 2007;357(9):874-884.

CRITICAL CARE NETWORK

Mechanical Ventilation and Airways Management Section

Lung protective ventilation (LPV) is the cornerstone to minimizing ventilator-induced lung injury. Hence, LPV is associated with better survival in patients both with and without ARDS.^1,2,3 Continuous monitoring of the tidal volume, plateau pressure, and positive end-expiratory pressure (PEEP) is crucial to maintain LPV. Electrical impedance tomography (EIT) is a noninvasive, radiation-free, imaging method of the electrical conductivity distribution inside the human body.⁴ Integrating EIT into invasive mechanical ventilation allows imaging of the regional lung ventilation as affected by the mechanical ventilation settings as well as the patient position. It can also provide a personalized approach to determining the optimum ventilatory settings based on individual patient conditions.^5,6

Optimum PEEP titration is crucial to prevent lung collapse as well as overdistension. In a single-center, randomized, crossover pilot study of 12 patients, optimum PEEP titration was carried out using a high PEEP/FiO₂ table vs EIT in moderate to severe ARDS. The primary endpoint was the reduction of mechanical power, which was consistently lower in the EIT group.⁷ EIT also allows the assessment of regional compliance of the lungs. There are reports regarding the superiority of regional compliance of lung over global compliance in achieving better gas exchange, lung compliance, and weaning of mechanical ventilation.⁸ EIT could assess the patient’s response to prone positioning by illustrating the change in the functional residual capacity between supine and prone positioning.⁹ In addition, by visualization of the ventilated areas during spontaneous breathing and reduction of pressure support, EIT could help in weaning off the mechanical ventilation.¹⁰

CHEST

In conclusion, EIT can be a tool to provide safe and personalized mechanical ventilation in patients with respiratory failure. However, there are limited data regarding its use and application, which might become an interesting subject for future clinical research.

– Akram M. Zaaqoq, MD, MPH

Member-at-Large


References

1. Amato MB, Barbas CS, Medeiros DM, et al. Effect of a protective-ventilation strategy on mortality in the acute respiratory distress syndrome. N Engl J Med. 1998;338(6):347-354.

2. Brower RG, Matthay MA, Morris A, et al. Ventilation with lower tidal volumes as compared with traditional tidal volumes for acute lung injury and the acute respiratory distress syndrome. N Engl J Med. 2000;342(18):1301-1308.

3. Neto AS, Simonis FD, Barbas CSV, et al. Lung-protective ventilation with low tidal volumes and the occurrence of pulmonary complications in patients without acute respiratory distress syndrome: a systematic review and individual patient data analysis. Crit Care Med. 2015;43(10):2155-2163.

4. Adler A, Boyle A. Electrical impedance tomography: tissue properties to image measures. IEEE Trans Biomed Eng. 2017;64(11):2494-2504.

5. Jang GY, Ayoub G, Kim YE, et al. Integrated EIT system for functional lung ventilation imaging. Biomed Eng Online. 2019;18(1):83.

6. Sella N, Pettenuzzo T, Zarantonello F, et al. Electrical impedance tomography: a compass for the safe route to optimal PEEP. Respir Med. 2021;187:106555.

7. Jimenez JV, Munroe E, Weirauch AJ, et al. Electric impedance tomography-guided PEEP titration reduces mechanical power in ARDS: a randomized crossover pilot trial. Crit Care. 2023;27(1):21.

8. Costa ELV, Borges JB, Melo A, et al. Bedside estimation of recruitable alveolar collapse and hyperdistension by electrical impedance tomography. Intensive Care Med. 2009;35(6):1132-1137.9. Riera J, Pérez P, Cortés J, Roca O, Masclans JR, Rello J. Effect of high-flow nasal cannula and body position on end-expiratory lung volume: a cohort study using electrical impedance tomography. Respir Care. 2013;58(4):589-596.10. Wisse JJ, Goos TG, Jonkman AH, et al. Electrical impedance tomography as a monitoring tool during weaning from mechanical ventilation: an observational study during the spontaneous breathing trial. Respir Res. 2024;25(1):179.
 

CRITICAL CARE NETWORK

Mechanical Ventilation and Airways Management Section

Lung protective ventilation (LPV) is the cornerstone to minimizing ventilator-induced lung injury. Hence, LPV is associated with better survival in patients both with and without ARDS.^1,2,3 Continuous monitoring of the tidal volume, plateau pressure, and positive end-expiratory pressure (PEEP) is crucial to maintain LPV. Electrical impedance tomography (EIT) is a noninvasive, radiation-free, imaging method of the electrical conductivity distribution inside the human body.⁴ Integrating EIT into invasive mechanical ventilation allows imaging of the regional lung ventilation as affected by the mechanical ventilation settings as well as the patient position. It can also provide a personalized approach to determining the optimum ventilatory settings based on individual patient conditions.^5,6

Optimum PEEP titration is crucial to prevent lung collapse as well as overdistension. In a single-center, randomized, crossover pilot study of 12 patients, optimum PEEP titration was carried out using a high PEEP/FiO₂ table vs EIT in moderate to severe ARDS. The primary endpoint was the reduction of mechanical power, which was consistently lower in the EIT group.⁷ EIT also allows the assessment of regional compliance of the lungs. There are reports regarding the superiority of regional compliance of lung over global compliance in achieving better gas exchange, lung compliance, and weaning of mechanical ventilation.⁸ EIT could assess the patient’s response to prone positioning by illustrating the change in the functional residual capacity between supine and prone positioning.⁹ In addition, by visualization of the ventilated areas during spontaneous breathing and reduction of pressure support, EIT could help in weaning off the mechanical ventilation.¹⁰

CHEST

In conclusion, EIT can be a tool to provide safe and personalized mechanical ventilation in patients with respiratory failure. However, there are limited data regarding its use and application, which might become an interesting subject for future clinical research.

– Akram M. Zaaqoq, MD, MPH

Member-at-Large


References

1. Amato MB, Barbas CS, Medeiros DM, et al. Effect of a protective-ventilation strategy on mortality in the acute respiratory distress syndrome. N Engl J Med. 1998;338(6):347-354.

2. Brower RG, Matthay MA, Morris A, et al. Ventilation with lower tidal volumes as compared with traditional tidal volumes for acute lung injury and the acute respiratory distress syndrome. N Engl J Med. 2000;342(18):1301-1308.

3. Neto AS, Simonis FD, Barbas CSV, et al. Lung-protective ventilation with low tidal volumes and the occurrence of pulmonary complications in patients without acute respiratory distress syndrome: a systematic review and individual patient data analysis. Crit Care Med. 2015;43(10):2155-2163.

4. Adler A, Boyle A. Electrical impedance tomography: tissue properties to image measures. IEEE Trans Biomed Eng. 2017;64(11):2494-2504.

5. Jang GY, Ayoub G, Kim YE, et al. Integrated EIT system for functional lung ventilation imaging. Biomed Eng Online. 2019;18(1):83.

6. Sella N, Pettenuzzo T, Zarantonello F, et al. Electrical impedance tomography: a compass for the safe route to optimal PEEP. Respir Med. 2021;187:106555.

7. Jimenez JV, Munroe E, Weirauch AJ, et al. Electric impedance tomography-guided PEEP titration reduces mechanical power in ARDS: a randomized crossover pilot trial. Crit Care. 2023;27(1):21.

8. Costa ELV, Borges JB, Melo A, et al. Bedside estimation of recruitable alveolar collapse and hyperdistension by electrical impedance tomography. Intensive Care Med. 2009;35(6):1132-1137.9. Riera J, Pérez P, Cortés J, Roca O, Masclans JR, Rello J. Effect of high-flow nasal cannula and body position on end-expiratory lung volume: a cohort study using electrical impedance tomography. Respir Care. 2013;58(4):589-596.10. Wisse JJ, Goos TG, Jonkman AH, et al. Electrical impedance tomography as a monitoring tool during weaning from mechanical ventilation: an observational study during the spontaneous breathing trial. Respir Res. 2024;25(1):179.
 

CRITICAL CARE NETWORK

Mechanical Ventilation and Airways Management Section

Lung protective ventilation (LPV) is the cornerstone to minimizing ventilator-induced lung injury. Hence, LPV is associated with better survival in patients both with and without ARDS.^1,2,3 Continuous monitoring of the tidal volume, plateau pressure, and positive end-expiratory pressure (PEEP) is crucial to maintain LPV. Electrical impedance tomography (EIT) is a noninvasive, radiation-free, imaging method of the electrical conductivity distribution inside the human body.⁴ Integrating EIT into invasive mechanical ventilation allows imaging of the regional lung ventilation as affected by the mechanical ventilation settings as well as the patient position. It can also provide a personalized approach to determining the optimum ventilatory settings based on individual patient conditions.^5,6

Optimum PEEP titration is crucial to prevent lung collapse as well as overdistension. In a single-center, randomized, crossover pilot study of 12 patients, optimum PEEP titration was carried out using a high PEEP/FiO₂ table vs EIT in moderate to severe ARDS. The primary endpoint was the reduction of mechanical power, which was consistently lower in the EIT group.⁷ EIT also allows the assessment of regional compliance of the lungs. There are reports regarding the superiority of regional compliance of lung over global compliance in achieving better gas exchange, lung compliance, and weaning of mechanical ventilation.⁸ EIT could assess the patient’s response to prone positioning by illustrating the change in the functional residual capacity between supine and prone positioning.⁹ In addition, by visualization of the ventilated areas during spontaneous breathing and reduction of pressure support, EIT could help in weaning off the mechanical ventilation.¹⁰

CHEST

In conclusion, EIT can be a tool to provide safe and personalized mechanical ventilation in patients with respiratory failure. However, there are limited data regarding its use and application, which might become an interesting subject for future clinical research.

– Akram M. Zaaqoq, MD, MPH

Member-at-Large


References

1. Amato MB, Barbas CS, Medeiros DM, et al. Effect of a protective-ventilation strategy on mortality in the acute respiratory distress syndrome. N Engl J Med. 1998;338(6):347-354.

2. Brower RG, Matthay MA, Morris A, et al. Ventilation with lower tidal volumes as compared with traditional tidal volumes for acute lung injury and the acute respiratory distress syndrome. N Engl J Med. 2000;342(18):1301-1308.

3. Neto AS, Simonis FD, Barbas CSV, et al. Lung-protective ventilation with low tidal volumes and the occurrence of pulmonary complications in patients without acute respiratory distress syndrome: a systematic review and individual patient data analysis. Crit Care Med. 2015;43(10):2155-2163.

4. Adler A, Boyle A. Electrical impedance tomography: tissue properties to image measures. IEEE Trans Biomed Eng. 2017;64(11):2494-2504.

5. Jang GY, Ayoub G, Kim YE, et al. Integrated EIT system for functional lung ventilation imaging. Biomed Eng Online. 2019;18(1):83.

6. Sella N, Pettenuzzo T, Zarantonello F, et al. Electrical impedance tomography: a compass for the safe route to optimal PEEP. Respir Med. 2021;187:106555.

7. Jimenez JV, Munroe E, Weirauch AJ, et al. Electric impedance tomography-guided PEEP titration reduces mechanical power in ARDS: a randomized crossover pilot trial. Crit Care. 2023;27(1):21.

8. Costa ELV, Borges JB, Melo A, et al. Bedside estimation of recruitable alveolar collapse and hyperdistension by electrical impedance tomography. Intensive Care Med. 2009;35(6):1132-1137.9. Riera J, Pérez P, Cortés J, Roca O, Masclans JR, Rello J. Effect of high-flow nasal cannula and body position on end-expiratory lung volume: a cohort study using electrical impedance tomography. Respir Care. 2013;58(4):589-596.10. Wisse JJ, Goos TG, Jonkman AH, et al. Electrical impedance tomography as a monitoring tool during weaning from mechanical ventilation: an observational study during the spontaneous breathing trial. Respir Res. 2024;25(1):179.