TBD Meeting (3181-22)

MONTREAL – In the treatment of thyroid nodules with radiofrequency ablation (RFA), the amount of energy delivered per unit volume of the nodule strongly correlates with the extent of nodule volume reduction after 6 and 12 months, suggesting an important indicator of treatment success.

The findings “provide an objective measure or goal energy input to achieve during the [RFA] procedure rather than relying only on the subjective judgment of sonographic changes, and in turn, produce more reliable outcomes for our patients,” first author Samantha A. Wolfe, MD, said in an interview.

Dr. Wolfe, of the department of otolaryngology – head and neck surgery at Johns Hopkins University, Baltimore, presented the findings at the American Thyroid Association annual meeting.

Commenting on the study, Insoo Suh, MD, an associate professor and associate vice chair of Surgical Innovation at New York University Langone Health, agreed that “an accounting of the total amount of energy delivered can be a useful additional data point for the operator when they are determining whether an ablation is successful.”

He noted, however, that the location of a nodule can be an important factor when deciding upon amounts of RF energy.

“Some target areas are too close for comfort to critical structures, such as the trachea or the recurrent laryngeal nerve, so sound judgment would dictate that the energy be dialed down in those areas, even if the price you pay is a slightly lower volume reduction,” he explained. 
 

Analysis of patients given RFA at Johns Hopkins

RFA utilizes RF energy for the reduction of nodule compression and aesthetic symptoms, avoiding the need for thyroid hormone replacement or surgery.

And while decisions regarding RFA treatment location and duration are commonly guided by the operator’s judgment of sonographic changes, those assessments can potentially result in inconsistent outcomes.

In observing a relationship between higher amounts of RF energy and nodule volume reduction, Dr. Wolfe and associates conducted their prospective study of nodules treated by two experienced endocrine surgeons at Johns Hopkins between June 2019 and May 2022 at 6 and 12 months in relation to the amount of total energy delivered during the treatment.

The analysis included 101 nodules, which had a median initial volume of 12.9 mL.

After 6 months, the median volume reduction ratio was 60%, and at 12 months, the median reduction was 64%.

In terms of the goal of achieving 50% or more volume reduction at 6 months, the median energy delivered was significantly higher for nodules that did reach that goal compared with those that had a volume reduction of less than 50% (2,317 vs. 1,912 J/mL, respectively; P = .01).

The figures were similar at 12 months (2,031 vs. 1254 J/mL; P < .01).

In a logistic regression analysis, the amount of energy delivered strongly increased the odds of obtaining a volume reduction ratio of at least 50% (odds ratio, 2.58; P = .048).

“Every twofold increase in energy delivered increases the odds of achieving a 50% volume ratio reduction by 2.58 times,” Dr. Wolfe explained.

Likewise, the same twofold increase in energy delivered also increased the odds of achieving a greater than 80% volume ratio reduction by 2.55 times (OR, 2.55; P = .038), she added.
 

Information may help to decide who needs multiple ablations

Of note, the effect was stronger with smaller nodules. Those with an initial volume of less than 20 mL had a significantly greater volume ratio reduction than nodules that were 20 mL or larger (61% vs. 48%, respectively; P = .05).

The initial volume of nodules that did, and did not, achieve a 50% volume ratio reduction at 6 months were 10.9 mL versus 19.1 mL, and the initial volumes of those that did, and did not, have at least a 50% reduction at 12 months were 10.5 mL and 41.5 mL.

“At 6 and 12 months, the successfully treated nodules had a significantly smaller immediate initial volume than those that did not,” Dr. Wolfe said.

“This information may aid in identifying patients with large nodules that are less likely to achieve a greater than 50% volume reduction ratio and may require multiple treatments,” she added.

Other factors – including the probe tip size and total energy delivered – did not significantly correlate with volume ratio reduction at 6 or 12 months.

There was also no significant difference in terms of thyroid-stimulating hormone levels among nodules that achieved at least a 50% volume reduction and those that did not.

Nodules that did not have a satisfactory volume reduction at 12 months had a relatively large median total energy value delivered during ablation (103,463 J, compared with 25,969 J among those achieving more than 50% volume ratio reduction), which Dr. Wolfe said likely reflects that those nodules had a large initial volume.

“This speaks to the importance of describing the energy utilized per unit of nodule volume rather than just a gross measurement,” she said during her presentation.

Dr. Wolfe added that in terms of strategies for getting more energy into the nodule, a key approach is time.

“Sometimes you will see sonographic changes very quickly in the nodule, and it could be tempting to consider that area ablated and move on if you only rely on sonographic changes,” she said in an interview. “However, our research shows that, by spending more time, and thus inputting more energy into the nodule, we had better volume reduction.”

Dr. Wolfe and Dr. Suh reported no relevant financial relationships.

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

MONTREAL – In the treatment of thyroid nodules with radiofrequency ablation (RFA), the amount of energy delivered per unit volume of the nodule strongly correlates with the extent of nodule volume reduction after 6 and 12 months, suggesting an important indicator of treatment success.

The findings “provide an objective measure or goal energy input to achieve during the [RFA] procedure rather than relying only on the subjective judgment of sonographic changes, and in turn, produce more reliable outcomes for our patients,” first author Samantha A. Wolfe, MD, said in an interview.

Dr. Wolfe, of the department of otolaryngology – head and neck surgery at Johns Hopkins University, Baltimore, presented the findings at the American Thyroid Association annual meeting.

Commenting on the study, Insoo Suh, MD, an associate professor and associate vice chair of Surgical Innovation at New York University Langone Health, agreed that “an accounting of the total amount of energy delivered can be a useful additional data point for the operator when they are determining whether an ablation is successful.”

He noted, however, that the location of a nodule can be an important factor when deciding upon amounts of RF energy.

“Some target areas are too close for comfort to critical structures, such as the trachea or the recurrent laryngeal nerve, so sound judgment would dictate that the energy be dialed down in those areas, even if the price you pay is a slightly lower volume reduction,” he explained. 
 

Analysis of patients given RFA at Johns Hopkins

RFA utilizes RF energy for the reduction of nodule compression and aesthetic symptoms, avoiding the need for thyroid hormone replacement or surgery.

And while decisions regarding RFA treatment location and duration are commonly guided by the operator’s judgment of sonographic changes, those assessments can potentially result in inconsistent outcomes.

In observing a relationship between higher amounts of RF energy and nodule volume reduction, Dr. Wolfe and associates conducted their prospective study of nodules treated by two experienced endocrine surgeons at Johns Hopkins between June 2019 and May 2022 at 6 and 12 months in relation to the amount of total energy delivered during the treatment.

The analysis included 101 nodules, which had a median initial volume of 12.9 mL.

After 6 months, the median volume reduction ratio was 60%, and at 12 months, the median reduction was 64%.

In terms of the goal of achieving 50% or more volume reduction at 6 months, the median energy delivered was significantly higher for nodules that did reach that goal compared with those that had a volume reduction of less than 50% (2,317 vs. 1,912 J/mL, respectively; P = .01).

The figures were similar at 12 months (2,031 vs. 1254 J/mL; P < .01).

In a logistic regression analysis, the amount of energy delivered strongly increased the odds of obtaining a volume reduction ratio of at least 50% (odds ratio, 2.58; P = .048).

“Every twofold increase in energy delivered increases the odds of achieving a 50% volume ratio reduction by 2.58 times,” Dr. Wolfe explained.

Likewise, the same twofold increase in energy delivered also increased the odds of achieving a greater than 80% volume ratio reduction by 2.55 times (OR, 2.55; P = .038), she added.
 

Information may help to decide who needs multiple ablations

Of note, the effect was stronger with smaller nodules. Those with an initial volume of less than 20 mL had a significantly greater volume ratio reduction than nodules that were 20 mL or larger (61% vs. 48%, respectively; P = .05).

The initial volume of nodules that did, and did not, achieve a 50% volume ratio reduction at 6 months were 10.9 mL versus 19.1 mL, and the initial volumes of those that did, and did not, have at least a 50% reduction at 12 months were 10.5 mL and 41.5 mL.

“At 6 and 12 months, the successfully treated nodules had a significantly smaller immediate initial volume than those that did not,” Dr. Wolfe said.

“This information may aid in identifying patients with large nodules that are less likely to achieve a greater than 50% volume reduction ratio and may require multiple treatments,” she added.

Other factors – including the probe tip size and total energy delivered – did not significantly correlate with volume ratio reduction at 6 or 12 months.

There was also no significant difference in terms of thyroid-stimulating hormone levels among nodules that achieved at least a 50% volume reduction and those that did not.

Nodules that did not have a satisfactory volume reduction at 12 months had a relatively large median total energy value delivered during ablation (103,463 J, compared with 25,969 J among those achieving more than 50% volume ratio reduction), which Dr. Wolfe said likely reflects that those nodules had a large initial volume.

“This speaks to the importance of describing the energy utilized per unit of nodule volume rather than just a gross measurement,” she said during her presentation.

Dr. Wolfe added that in terms of strategies for getting more energy into the nodule, a key approach is time.

“Sometimes you will see sonographic changes very quickly in the nodule, and it could be tempting to consider that area ablated and move on if you only rely on sonographic changes,” she said in an interview. “However, our research shows that, by spending more time, and thus inputting more energy into the nodule, we had better volume reduction.”

Dr. Wolfe and Dr. Suh reported no relevant financial relationships.

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

MONTREAL – In the treatment of thyroid nodules with radiofrequency ablation (RFA), the amount of energy delivered per unit volume of the nodule strongly correlates with the extent of nodule volume reduction after 6 and 12 months, suggesting an important indicator of treatment success.

The findings “provide an objective measure or goal energy input to achieve during the [RFA] procedure rather than relying only on the subjective judgment of sonographic changes, and in turn, produce more reliable outcomes for our patients,” first author Samantha A. Wolfe, MD, said in an interview.

Dr. Wolfe, of the department of otolaryngology – head and neck surgery at Johns Hopkins University, Baltimore, presented the findings at the American Thyroid Association annual meeting.

Commenting on the study, Insoo Suh, MD, an associate professor and associate vice chair of Surgical Innovation at New York University Langone Health, agreed that “an accounting of the total amount of energy delivered can be a useful additional data point for the operator when they are determining whether an ablation is successful.”

He noted, however, that the location of a nodule can be an important factor when deciding upon amounts of RF energy.

“Some target areas are too close for comfort to critical structures, such as the trachea or the recurrent laryngeal nerve, so sound judgment would dictate that the energy be dialed down in those areas, even if the price you pay is a slightly lower volume reduction,” he explained. 
 

Analysis of patients given RFA at Johns Hopkins

RFA utilizes RF energy for the reduction of nodule compression and aesthetic symptoms, avoiding the need for thyroid hormone replacement or surgery.

And while decisions regarding RFA treatment location and duration are commonly guided by the operator’s judgment of sonographic changes, those assessments can potentially result in inconsistent outcomes.

In observing a relationship between higher amounts of RF energy and nodule volume reduction, Dr. Wolfe and associates conducted their prospective study of nodules treated by two experienced endocrine surgeons at Johns Hopkins between June 2019 and May 2022 at 6 and 12 months in relation to the amount of total energy delivered during the treatment.

The analysis included 101 nodules, which had a median initial volume of 12.9 mL.

After 6 months, the median volume reduction ratio was 60%, and at 12 months, the median reduction was 64%.

In terms of the goal of achieving 50% or more volume reduction at 6 months, the median energy delivered was significantly higher for nodules that did reach that goal compared with those that had a volume reduction of less than 50% (2,317 vs. 1,912 J/mL, respectively; P = .01).

The figures were similar at 12 months (2,031 vs. 1254 J/mL; P < .01).

In a logistic regression analysis, the amount of energy delivered strongly increased the odds of obtaining a volume reduction ratio of at least 50% (odds ratio, 2.58; P = .048).

“Every twofold increase in energy delivered increases the odds of achieving a 50% volume ratio reduction by 2.58 times,” Dr. Wolfe explained.

Likewise, the same twofold increase in energy delivered also increased the odds of achieving a greater than 80% volume ratio reduction by 2.55 times (OR, 2.55; P = .038), she added.
 

Information may help to decide who needs multiple ablations

Of note, the effect was stronger with smaller nodules. Those with an initial volume of less than 20 mL had a significantly greater volume ratio reduction than nodules that were 20 mL or larger (61% vs. 48%, respectively; P = .05).

The initial volume of nodules that did, and did not, achieve a 50% volume ratio reduction at 6 months were 10.9 mL versus 19.1 mL, and the initial volumes of those that did, and did not, have at least a 50% reduction at 12 months were 10.5 mL and 41.5 mL.

“At 6 and 12 months, the successfully treated nodules had a significantly smaller immediate initial volume than those that did not,” Dr. Wolfe said.

“This information may aid in identifying patients with large nodules that are less likely to achieve a greater than 50% volume reduction ratio and may require multiple treatments,” she added.

Other factors – including the probe tip size and total energy delivered – did not significantly correlate with volume ratio reduction at 6 or 12 months.

There was also no significant difference in terms of thyroid-stimulating hormone levels among nodules that achieved at least a 50% volume reduction and those that did not.

Nodules that did not have a satisfactory volume reduction at 12 months had a relatively large median total energy value delivered during ablation (103,463 J, compared with 25,969 J among those achieving more than 50% volume ratio reduction), which Dr. Wolfe said likely reflects that those nodules had a large initial volume.

“This speaks to the importance of describing the energy utilized per unit of nodule volume rather than just a gross measurement,” she said during her presentation.

Dr. Wolfe added that in terms of strategies for getting more energy into the nodule, a key approach is time.

“Sometimes you will see sonographic changes very quickly in the nodule, and it could be tempting to consider that area ablated and move on if you only rely on sonographic changes,” she said in an interview. “However, our research shows that, by spending more time, and thus inputting more energy into the nodule, we had better volume reduction.”

Dr. Wolfe and Dr. Suh reported no relevant financial relationships.

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

MONTREAL – Patients hospitalized with severe COVID-19 and no prior history of thyroid dysfunction show signs of thyroiditis that, although asymptomatic, continue to persist for up to a year after infection, according to research that adds to evidence on the complex involvement of the thyroid in COVID-19.

“To our knowledge these findings are novel,” first author Ilaria Muller, MD, PhD, an assistant professor in endocrinology in the department of clinical sciences and community health, University of Milan, told this news organization.

“Little has been written about the long-term follow-up of thyroid function after severe COVID-19 disease, and we have followed patients up to 1 year after infection.”

The effects are seen in about 10%-15% of patients, and “[while] the thyroid dysfunction is transient, ultrasound areas of thyroiditis may persist after 1 year, even if they progressively shrink,” said Dr. Muller, who presented the findings at the American Thyroid Association annual meeting.
 

Immunological scars? Clinical implications unclear

The nature and implications of the persistent thyroiditis areas are uncertain, Dr. Muller noted. “These areas of thyroiditis are likely a sort of ‘immunologic scar’ of the previous SARS-CoV-2 infection,” she explained. “We still don’t know if there are clinical implications, even if they seem unlikely.”

Of note, increases in autoimmune processes or a higher incidence of thyroid dysfunction after COVID-19 have not been observed, and the shrinkage of the areas of thyroiditis over time is encouraging, she said.

The reasons why some patients develop atypical thyroiditis and others don’t are also unclear, with Dr. Muller’s team investigating further. Importantly, similar effects have been associated with other severe infections, not just COVID-19. “It is well known that in classic subacute thyroiditis due to other viral infections, the areas of thyroiditis persist for months, so this phenomenon might not be unique to COVID-19,” she explained.

Commenting on the story, Jeffrey R. Garber, MD, also noted that such thyroiditis areas stemming from other types of infection may persist – but go unnoticed.

“Resolution is the clinical rule, [and] we generally do not restudy in detail those who clinically recover,” he said in an interview. “However, there is evidence of impaired thyroid reserve in those who recover from viral thyroiditis due to other sources.”

“Thyroid symptoms are often not specific, so ‘atypical’ [cases] are common, [and] resolution with restoring thyroid status to normal is mixed,” noted Dr. Garber, an associate professor of medicine at Harvard Medical School and chief of the division of endocrinology at Atrius Health, Boston.

In terms of clinical practice, while such issues should be kept in mind when evaluating abnormal thyroid tests during severe COVID-19, “it is not a call for routinely checking it in the absence of clinical suspicion,” he observed.
 

Study details

Dr. Muller and her team previously observed that patients hospitalized in intensive care with COVID-19 often had low or suppressed serum thyroid-stimulating hormone (TSH) levels, with and without elevated free thyroxine (FT₄) concentrations, suggestive of thyrotoxicosis.

Upon investigating those cases, they found, as in their previous study reported by this news organization, that a painless, atypical thyroiditis occurs with nonthyroidal illness syndrome among patients hospitalized with severe COVID-19. The atypical thyroiditis was slightly more common in men and was associated with lymphopenia.

To further investigate those cases and follow patients up to 1 year, the team conducted a longitudinal study of 183 patients hospitalized with severe COVID-19 in Italy. The patients, who had no known prior history of thyroid dysfunction, were assessed for serum thyroid function, autoantibodies, and inflammatory markers.

At baseline, 10% of the patients were found to have thyrotoxicosis, and ultrasound performed within 2-3 months postinfection on 65 patients showed that 18 (28%) had areas of thyroiditis.

Importantly, 60% of those patients with the areas of thyroiditis had low TSH levels, while 25% had normal TSH levels (P = .034).

In addition, those showing the presence of thyroiditis on ultrasound at 23 months were more likely to have elevated serum concentrations of FT₄ (P = .018) and higher levels of interleukin-26 (P = .016), compared with those with normal ultrasound readings.

In a longitudinal analysis further following patients post infection, among 15 patients who were evaluated at 6 months, most, 13 (87%), still had areas of thyroiditis, and 6 of 12 (50%) had thyroiditis areas that, though reduced in size, still persisted even at 12 months.

In terms of thyroid uptake, at 3 months, 14 of 17 patients (82%) had diffused or focal areas of a reduction of uptake. After 6 months, there was a recovery, with a median of 28% of thyroid uptake recovered, however, 67% of patients still had some focal or diffused reduction in thyroid uptake.

Of note, the indications of thyroiditis on imaging persisted even though patients’ TSH levels had quickly normalized at the end of infection and remained normal up to 1 year of follow-up.

The patients showed no apparent development of thyroglobulin antibody, thyroid peroxidase antibodies, or TSH receptor antibodies.

A further fine needle aspiration analysis of eight patients with atypical thyroiditis at 3 months after infection showed that those patients had tissue resident memory T cells (CD4+/CD8+/CD103+/CD69+) within the thyroid, but not in the blood as expected.

Additional assessments at 8 months after infection showed those tissue resident memory T cells continued to be present on imaging.

The results showed “SARS-CoV-2–specific T cells were enriched within the thyroid compared with the blood, many with a tissue resident phenotype,” Dr. Muller explained.

The findings are notable in that “such an in-depth characterization of areas of thyroiditis triggered by SARS-CoV-2 infection combining ultrasound, scintigraphy, and immunological phenotyping has not been performed so far,” she said.

“In particular, SARS-CoV-2–specific tissue-resident memory T lymphocytes have not been described before in the thyroid gland.”

Dr. Muller and Dr. Garber have reported no relevant financial relationships.

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

MONTREAL – Patients hospitalized with severe COVID-19 and no prior history of thyroid dysfunction show signs of thyroiditis that, although asymptomatic, continue to persist for up to a year after infection, according to research that adds to evidence on the complex involvement of the thyroid in COVID-19.

“To our knowledge these findings are novel,” first author Ilaria Muller, MD, PhD, an assistant professor in endocrinology in the department of clinical sciences and community health, University of Milan, told this news organization.

“Little has been written about the long-term follow-up of thyroid function after severe COVID-19 disease, and we have followed patients up to 1 year after infection.”

The effects are seen in about 10%-15% of patients, and “[while] the thyroid dysfunction is transient, ultrasound areas of thyroiditis may persist after 1 year, even if they progressively shrink,” said Dr. Muller, who presented the findings at the American Thyroid Association annual meeting.
 

Immunological scars? Clinical implications unclear

The nature and implications of the persistent thyroiditis areas are uncertain, Dr. Muller noted. “These areas of thyroiditis are likely a sort of ‘immunologic scar’ of the previous SARS-CoV-2 infection,” she explained. “We still don’t know if there are clinical implications, even if they seem unlikely.”

Of note, increases in autoimmune processes or a higher incidence of thyroid dysfunction after COVID-19 have not been observed, and the shrinkage of the areas of thyroiditis over time is encouraging, she said.

The reasons why some patients develop atypical thyroiditis and others don’t are also unclear, with Dr. Muller’s team investigating further. Importantly, similar effects have been associated with other severe infections, not just COVID-19. “It is well known that in classic subacute thyroiditis due to other viral infections, the areas of thyroiditis persist for months, so this phenomenon might not be unique to COVID-19,” she explained.

Commenting on the story, Jeffrey R. Garber, MD, also noted that such thyroiditis areas stemming from other types of infection may persist – but go unnoticed.

“Resolution is the clinical rule, [and] we generally do not restudy in detail those who clinically recover,” he said in an interview. “However, there is evidence of impaired thyroid reserve in those who recover from viral thyroiditis due to other sources.”

“Thyroid symptoms are often not specific, so ‘atypical’ [cases] are common, [and] resolution with restoring thyroid status to normal is mixed,” noted Dr. Garber, an associate professor of medicine at Harvard Medical School and chief of the division of endocrinology at Atrius Health, Boston.

In terms of clinical practice, while such issues should be kept in mind when evaluating abnormal thyroid tests during severe COVID-19, “it is not a call for routinely checking it in the absence of clinical suspicion,” he observed.
 

Study details

Dr. Muller and her team previously observed that patients hospitalized in intensive care with COVID-19 often had low or suppressed serum thyroid-stimulating hormone (TSH) levels, with and without elevated free thyroxine (FT₄) concentrations, suggestive of thyrotoxicosis.

Upon investigating those cases, they found, as in their previous study reported by this news organization, that a painless, atypical thyroiditis occurs with nonthyroidal illness syndrome among patients hospitalized with severe COVID-19. The atypical thyroiditis was slightly more common in men and was associated with lymphopenia.

To further investigate those cases and follow patients up to 1 year, the team conducted a longitudinal study of 183 patients hospitalized with severe COVID-19 in Italy. The patients, who had no known prior history of thyroid dysfunction, were assessed for serum thyroid function, autoantibodies, and inflammatory markers.

At baseline, 10% of the patients were found to have thyrotoxicosis, and ultrasound performed within 2-3 months postinfection on 65 patients showed that 18 (28%) had areas of thyroiditis.

Importantly, 60% of those patients with the areas of thyroiditis had low TSH levels, while 25% had normal TSH levels (P = .034).

In addition, those showing the presence of thyroiditis on ultrasound at 23 months were more likely to have elevated serum concentrations of FT₄ (P = .018) and higher levels of interleukin-26 (P = .016), compared with those with normal ultrasound readings.

In a longitudinal analysis further following patients post infection, among 15 patients who were evaluated at 6 months, most, 13 (87%), still had areas of thyroiditis, and 6 of 12 (50%) had thyroiditis areas that, though reduced in size, still persisted even at 12 months.

In terms of thyroid uptake, at 3 months, 14 of 17 patients (82%) had diffused or focal areas of a reduction of uptake. After 6 months, there was a recovery, with a median of 28% of thyroid uptake recovered, however, 67% of patients still had some focal or diffused reduction in thyroid uptake.

Of note, the indications of thyroiditis on imaging persisted even though patients’ TSH levels had quickly normalized at the end of infection and remained normal up to 1 year of follow-up.

The patients showed no apparent development of thyroglobulin antibody, thyroid peroxidase antibodies, or TSH receptor antibodies.

A further fine needle aspiration analysis of eight patients with atypical thyroiditis at 3 months after infection showed that those patients had tissue resident memory T cells (CD4+/CD8+/CD103+/CD69+) within the thyroid, but not in the blood as expected.

Additional assessments at 8 months after infection showed those tissue resident memory T cells continued to be present on imaging.

The results showed “SARS-CoV-2–specific T cells were enriched within the thyroid compared with the blood, many with a tissue resident phenotype,” Dr. Muller explained.

The findings are notable in that “such an in-depth characterization of areas of thyroiditis triggered by SARS-CoV-2 infection combining ultrasound, scintigraphy, and immunological phenotyping has not been performed so far,” she said.

“In particular, SARS-CoV-2–specific tissue-resident memory T lymphocytes have not been described before in the thyroid gland.”

Dr. Muller and Dr. Garber have reported no relevant financial relationships.

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

MONTREAL – Patients hospitalized with severe COVID-19 and no prior history of thyroid dysfunction show signs of thyroiditis that, although asymptomatic, continue to persist for up to a year after infection, according to research that adds to evidence on the complex involvement of the thyroid in COVID-19.

“To our knowledge these findings are novel,” first author Ilaria Muller, MD, PhD, an assistant professor in endocrinology in the department of clinical sciences and community health, University of Milan, told this news organization.

“Little has been written about the long-term follow-up of thyroid function after severe COVID-19 disease, and we have followed patients up to 1 year after infection.”

The effects are seen in about 10%-15% of patients, and “[while] the thyroid dysfunction is transient, ultrasound areas of thyroiditis may persist after 1 year, even if they progressively shrink,” said Dr. Muller, who presented the findings at the American Thyroid Association annual meeting.
 

Immunological scars? Clinical implications unclear

The nature and implications of the persistent thyroiditis areas are uncertain, Dr. Muller noted. “These areas of thyroiditis are likely a sort of ‘immunologic scar’ of the previous SARS-CoV-2 infection,” she explained. “We still don’t know if there are clinical implications, even if they seem unlikely.”

Of note, increases in autoimmune processes or a higher incidence of thyroid dysfunction after COVID-19 have not been observed, and the shrinkage of the areas of thyroiditis over time is encouraging, she said.

The reasons why some patients develop atypical thyroiditis and others don’t are also unclear, with Dr. Muller’s team investigating further. Importantly, similar effects have been associated with other severe infections, not just COVID-19. “It is well known that in classic subacute thyroiditis due to other viral infections, the areas of thyroiditis persist for months, so this phenomenon might not be unique to COVID-19,” she explained.

Commenting on the story, Jeffrey R. Garber, MD, also noted that such thyroiditis areas stemming from other types of infection may persist – but go unnoticed.

“Resolution is the clinical rule, [and] we generally do not restudy in detail those who clinically recover,” he said in an interview. “However, there is evidence of impaired thyroid reserve in those who recover from viral thyroiditis due to other sources.”

“Thyroid symptoms are often not specific, so ‘atypical’ [cases] are common, [and] resolution with restoring thyroid status to normal is mixed,” noted Dr. Garber, an associate professor of medicine at Harvard Medical School and chief of the division of endocrinology at Atrius Health, Boston.

In terms of clinical practice, while such issues should be kept in mind when evaluating abnormal thyroid tests during severe COVID-19, “it is not a call for routinely checking it in the absence of clinical suspicion,” he observed.
 

Study details

Dr. Muller and her team previously observed that patients hospitalized in intensive care with COVID-19 often had low or suppressed serum thyroid-stimulating hormone (TSH) levels, with and without elevated free thyroxine (FT₄) concentrations, suggestive of thyrotoxicosis.

Upon investigating those cases, they found, as in their previous study reported by this news organization, that a painless, atypical thyroiditis occurs with nonthyroidal illness syndrome among patients hospitalized with severe COVID-19. The atypical thyroiditis was slightly more common in men and was associated with lymphopenia.

To further investigate those cases and follow patients up to 1 year, the team conducted a longitudinal study of 183 patients hospitalized with severe COVID-19 in Italy. The patients, who had no known prior history of thyroid dysfunction, were assessed for serum thyroid function, autoantibodies, and inflammatory markers.

At baseline, 10% of the patients were found to have thyrotoxicosis, and ultrasound performed within 2-3 months postinfection on 65 patients showed that 18 (28%) had areas of thyroiditis.

Importantly, 60% of those patients with the areas of thyroiditis had low TSH levels, while 25% had normal TSH levels (P = .034).

In addition, those showing the presence of thyroiditis on ultrasound at 23 months were more likely to have elevated serum concentrations of FT₄ (P = .018) and higher levels of interleukin-26 (P = .016), compared with those with normal ultrasound readings.

In a longitudinal analysis further following patients post infection, among 15 patients who were evaluated at 6 months, most, 13 (87%), still had areas of thyroiditis, and 6 of 12 (50%) had thyroiditis areas that, though reduced in size, still persisted even at 12 months.

In terms of thyroid uptake, at 3 months, 14 of 17 patients (82%) had diffused or focal areas of a reduction of uptake. After 6 months, there was a recovery, with a median of 28% of thyroid uptake recovered, however, 67% of patients still had some focal or diffused reduction in thyroid uptake.

Of note, the indications of thyroiditis on imaging persisted even though patients’ TSH levels had quickly normalized at the end of infection and remained normal up to 1 year of follow-up.

The patients showed no apparent development of thyroglobulin antibody, thyroid peroxidase antibodies, or TSH receptor antibodies.

A further fine needle aspiration analysis of eight patients with atypical thyroiditis at 3 months after infection showed that those patients had tissue resident memory T cells (CD4+/CD8+/CD103+/CD69+) within the thyroid, but not in the blood as expected.

Additional assessments at 8 months after infection showed those tissue resident memory T cells continued to be present on imaging.

The results showed “SARS-CoV-2–specific T cells were enriched within the thyroid compared with the blood, many with a tissue resident phenotype,” Dr. Muller explained.

The findings are notable in that “such an in-depth characterization of areas of thyroiditis triggered by SARS-CoV-2 infection combining ultrasound, scintigraphy, and immunological phenotyping has not been performed so far,” she said.

“In particular, SARS-CoV-2–specific tissue-resident memory T lymphocytes have not been described before in the thyroid gland.”

Dr. Muller and Dr. Garber have reported no relevant financial relationships.

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

MONTREAL – Pediatric patients with low-risk differentiated thyroid cancer (DTC) who are spared radioactive iodine (RAI) therapy show no increases in the risk of remission, compared with those who do receive it, supporting guidelines that recommend against use of RAI in such patients.

“In 2015, when the American Thyroid Association [ATA] created their pediatric guidelines [on RAI therapy in DTC], they were taking a leap of faith that these [pediatric DTC] patients would be able to achieve remission without RAI,” said first author Mya Bojarsky, Children’s Hospital of Philadelphia (CHOP), when presenting the findings at the American Thyroid Association annual meeting.

“This is the first study to validate those guidelines and support the sentiment that for ATA low-risk pediatric thyroid cancer patients, withholding RAI therapy is clinically beneficial as it reduces exposure to radiation while having no negative impact on remission,” she said.

Prior to 2015, thyroidectomy in combination with RAI was the standard treatment for DTC in pediatric patients. However, data showing that radiation exposure in children increases the risk of secondary hematologic malignancies by 51% and solid malignancies by 23% over a lifetime raised concerns and led to a push to change the treatment approach.

In response, the 2015 ATA pediatric guidelines recommended that patients not receive RAI for the treatment of DTC that was mostly confined to the thyroid (N0 or minimal N1a disease).

Senior author Andrew J. Bauer, MD, noted that, in addition to being the first study to confirm that withholding RAI in low-risk patients is associated with the same rate of achieving remission as patients treated with RAI, the study also endorses that assessments at 1 year can be reliable predictors of remission.

“For these patients, the 1-year mark post-initial treatment (thyroidectomy) is an early and accurate time point for initial assessment of remission, with increasing rates of remission with continued surveillance (at last clinical follow-up) of approximately 90% 2 years post initial treatment,” said Dr. Bauer, medical director, CHOP, and professor of pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia.

“This approach has recently been validated through a prospective study in adult patients,” he added. A large recent study of 730 patients, published in the New England Journal of Medicine, supported the omission of RAI in low-risk DTC in adults, showing that, compared with those who received RAI, the no-RAI group was noninferior in the occurrence of functional, structural, and biologic events at 3 years.
 

Safe to eliminate RAI therapy in low-risk DTC in children

With limited data on how or if the change in treatment had an impact on rates of remission in pediatric patients, Ms. Bojarsky and colleagues conducted a retrospective cohort study of patients under the age of 19 years with ATA low-risk DTC who had undergone a total thyroidectomy at CHOP between 2010 and 2020.

Overall, they identified 95 patients, including 50 who had been treated with RAI in addition to thyroidectomy and 45 who did not receive RAI. Among those who did receive RAI, 31 were treated prior to 2015, and 19 were treated after 2019.

For the study, remission was defined as having undetectable thyroglobulin levels as well as no evidence of disease by ultrasound, Ms. Bojarsky said.

“This is important to show, because we want to ensure that as we are reducing our RAI use in the pediatric population, we were not negatively impacting their ability to achieve remission,” she explained.

The percentage of low-risk pediatric patients with DTC treated with RAI had already dropped from 100% in 2010 down to 38% by 2015 when the guidelines were issued, and after a slight rise to 50% by 2018, the practice plummeted to 0% by 2020, the study shows.

In terms of remission, at 1 year post-treatment, 80% of patients who received RAI were in remission, and the rate was even slightly higher, at 84%, among those who did not receive RAI, for a difference that was not significant.

Further looking at disease status as of the last clinical evaluation, 90% in the group treated with RAI had no evidence of disease at a median of 4.9 years of follow-up, and the rate was 87% in the group not receiving RAI, which had a median of 2.7 years of follow-up.

“In ATA low-risk patients, there is no detriment in achieving remission if RAI therapy is withheld,” say investigators.   

The median tumor size in the RAI group was larger (19.5 mm vs. 12.0 mm; P < .001), and the primary tumor was T1 in 44% of the RAI group but 82% in the no-RAI group (P < .001).

The lymph node status was N0 in 72% of those receiving RAI and 76% in the no RAI group, which was not significantly different.

The leading risk factors associated with treatment with RAI included larger primary tumor size (OR, 1.07; P = .003), lymph node metastasis (OR, 3.72; P = .036), and surgery pre-2015 (OR, 9.83; P < .001).

RAI administration, N1a disease, and surgery prior to 2015 were not independent risk factors for evidence of persistent disease or indeterminate status.

Ms. Bojarsky has reported no relevant financial relationships.

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

MONTREAL – Pediatric patients with low-risk differentiated thyroid cancer (DTC) who are spared radioactive iodine (RAI) therapy show no increases in the risk of remission, compared with those who do receive it, supporting guidelines that recommend against use of RAI in such patients.

“In 2015, when the American Thyroid Association [ATA] created their pediatric guidelines [on RAI therapy in DTC], they were taking a leap of faith that these [pediatric DTC] patients would be able to achieve remission without RAI,” said first author Mya Bojarsky, Children’s Hospital of Philadelphia (CHOP), when presenting the findings at the American Thyroid Association annual meeting.

“This is the first study to validate those guidelines and support the sentiment that for ATA low-risk pediatric thyroid cancer patients, withholding RAI therapy is clinically beneficial as it reduces exposure to radiation while having no negative impact on remission,” she said.

Prior to 2015, thyroidectomy in combination with RAI was the standard treatment for DTC in pediatric patients. However, data showing that radiation exposure in children increases the risk of secondary hematologic malignancies by 51% and solid malignancies by 23% over a lifetime raised concerns and led to a push to change the treatment approach.

In response, the 2015 ATA pediatric guidelines recommended that patients not receive RAI for the treatment of DTC that was mostly confined to the thyroid (N0 or minimal N1a disease).

Senior author Andrew J. Bauer, MD, noted that, in addition to being the first study to confirm that withholding RAI in low-risk patients is associated with the same rate of achieving remission as patients treated with RAI, the study also endorses that assessments at 1 year can be reliable predictors of remission.

“For these patients, the 1-year mark post-initial treatment (thyroidectomy) is an early and accurate time point for initial assessment of remission, with increasing rates of remission with continued surveillance (at last clinical follow-up) of approximately 90% 2 years post initial treatment,” said Dr. Bauer, medical director, CHOP, and professor of pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia.

“This approach has recently been validated through a prospective study in adult patients,” he added. A large recent study of 730 patients, published in the New England Journal of Medicine, supported the omission of RAI in low-risk DTC in adults, showing that, compared with those who received RAI, the no-RAI group was noninferior in the occurrence of functional, structural, and biologic events at 3 years.
 

Safe to eliminate RAI therapy in low-risk DTC in children

With limited data on how or if the change in treatment had an impact on rates of remission in pediatric patients, Ms. Bojarsky and colleagues conducted a retrospective cohort study of patients under the age of 19 years with ATA low-risk DTC who had undergone a total thyroidectomy at CHOP between 2010 and 2020.

Overall, they identified 95 patients, including 50 who had been treated with RAI in addition to thyroidectomy and 45 who did not receive RAI. Among those who did receive RAI, 31 were treated prior to 2015, and 19 were treated after 2019.

For the study, remission was defined as having undetectable thyroglobulin levels as well as no evidence of disease by ultrasound, Ms. Bojarsky said.

“This is important to show, because we want to ensure that as we are reducing our RAI use in the pediatric population, we were not negatively impacting their ability to achieve remission,” she explained.

The percentage of low-risk pediatric patients with DTC treated with RAI had already dropped from 100% in 2010 down to 38% by 2015 when the guidelines were issued, and after a slight rise to 50% by 2018, the practice plummeted to 0% by 2020, the study shows.

In terms of remission, at 1 year post-treatment, 80% of patients who received RAI were in remission, and the rate was even slightly higher, at 84%, among those who did not receive RAI, for a difference that was not significant.

Further looking at disease status as of the last clinical evaluation, 90% in the group treated with RAI had no evidence of disease at a median of 4.9 years of follow-up, and the rate was 87% in the group not receiving RAI, which had a median of 2.7 years of follow-up.

“In ATA low-risk patients, there is no detriment in achieving remission if RAI therapy is withheld,” say investigators.   

The median tumor size in the RAI group was larger (19.5 mm vs. 12.0 mm; P < .001), and the primary tumor was T1 in 44% of the RAI group but 82% in the no-RAI group (P < .001).

The lymph node status was N0 in 72% of those receiving RAI and 76% in the no RAI group, which was not significantly different.

The leading risk factors associated with treatment with RAI included larger primary tumor size (OR, 1.07; P = .003), lymph node metastasis (OR, 3.72; P = .036), and surgery pre-2015 (OR, 9.83; P < .001).

RAI administration, N1a disease, and surgery prior to 2015 were not independent risk factors for evidence of persistent disease or indeterminate status.

Ms. Bojarsky has reported no relevant financial relationships.

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

MONTREAL – Pediatric patients with low-risk differentiated thyroid cancer (DTC) who are spared radioactive iodine (RAI) therapy show no increases in the risk of remission, compared with those who do receive it, supporting guidelines that recommend against use of RAI in such patients.

“In 2015, when the American Thyroid Association [ATA] created their pediatric guidelines [on RAI therapy in DTC], they were taking a leap of faith that these [pediatric DTC] patients would be able to achieve remission without RAI,” said first author Mya Bojarsky, Children’s Hospital of Philadelphia (CHOP), when presenting the findings at the American Thyroid Association annual meeting.

“This is the first study to validate those guidelines and support the sentiment that for ATA low-risk pediatric thyroid cancer patients, withholding RAI therapy is clinically beneficial as it reduces exposure to radiation while having no negative impact on remission,” she said.

Prior to 2015, thyroidectomy in combination with RAI was the standard treatment for DTC in pediatric patients. However, data showing that radiation exposure in children increases the risk of secondary hematologic malignancies by 51% and solid malignancies by 23% over a lifetime raised concerns and led to a push to change the treatment approach.

In response, the 2015 ATA pediatric guidelines recommended that patients not receive RAI for the treatment of DTC that was mostly confined to the thyroid (N0 or minimal N1a disease).

Senior author Andrew J. Bauer, MD, noted that, in addition to being the first study to confirm that withholding RAI in low-risk patients is associated with the same rate of achieving remission as patients treated with RAI, the study also endorses that assessments at 1 year can be reliable predictors of remission.

“For these patients, the 1-year mark post-initial treatment (thyroidectomy) is an early and accurate time point for initial assessment of remission, with increasing rates of remission with continued surveillance (at last clinical follow-up) of approximately 90% 2 years post initial treatment,” said Dr. Bauer, medical director, CHOP, and professor of pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia.

“This approach has recently been validated through a prospective study in adult patients,” he added. A large recent study of 730 patients, published in the New England Journal of Medicine, supported the omission of RAI in low-risk DTC in adults, showing that, compared with those who received RAI, the no-RAI group was noninferior in the occurrence of functional, structural, and biologic events at 3 years.
 

Safe to eliminate RAI therapy in low-risk DTC in children

With limited data on how or if the change in treatment had an impact on rates of remission in pediatric patients, Ms. Bojarsky and colleagues conducted a retrospective cohort study of patients under the age of 19 years with ATA low-risk DTC who had undergone a total thyroidectomy at CHOP between 2010 and 2020.

Overall, they identified 95 patients, including 50 who had been treated with RAI in addition to thyroidectomy and 45 who did not receive RAI. Among those who did receive RAI, 31 were treated prior to 2015, and 19 were treated after 2019.

For the study, remission was defined as having undetectable thyroglobulin levels as well as no evidence of disease by ultrasound, Ms. Bojarsky said.

“This is important to show, because we want to ensure that as we are reducing our RAI use in the pediatric population, we were not negatively impacting their ability to achieve remission,” she explained.

The percentage of low-risk pediatric patients with DTC treated with RAI had already dropped from 100% in 2010 down to 38% by 2015 when the guidelines were issued, and after a slight rise to 50% by 2018, the practice plummeted to 0% by 2020, the study shows.

In terms of remission, at 1 year post-treatment, 80% of patients who received RAI were in remission, and the rate was even slightly higher, at 84%, among those who did not receive RAI, for a difference that was not significant.

Further looking at disease status as of the last clinical evaluation, 90% in the group treated with RAI had no evidence of disease at a median of 4.9 years of follow-up, and the rate was 87% in the group not receiving RAI, which had a median of 2.7 years of follow-up.

“In ATA low-risk patients, there is no detriment in achieving remission if RAI therapy is withheld,” say investigators.   

The median tumor size in the RAI group was larger (19.5 mm vs. 12.0 mm; P < .001), and the primary tumor was T1 in 44% of the RAI group but 82% in the no-RAI group (P < .001).

The lymph node status was N0 in 72% of those receiving RAI and 76% in the no RAI group, which was not significantly different.

The leading risk factors associated with treatment with RAI included larger primary tumor size (OR, 1.07; P = .003), lymph node metastasis (OR, 3.72; P = .036), and surgery pre-2015 (OR, 9.83; P < .001).

RAI administration, N1a disease, and surgery prior to 2015 were not independent risk factors for evidence of persistent disease or indeterminate status.

Ms. Bojarsky has reported no relevant financial relationships.

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

MONTREAL – Patients who discontinue levothyroxine for subclinical hypothyroidism may gravitate towards becoming mildly hypothyroid again, but they importantly show no differences in terms of symptoms and quality of life – and sometimes show even improvement – compared with those who continue treatment, new research shows.

“Our results show feasibility of patient enrollment and safety of discontinuing levothyroxine in patients with subclinical hypothyroidism,” said first author Spyridoula Maraka, MD, when presenting the findings at the American Thyroid Association annual meeting.

Recommendations against levothyroxine for subclinical hypothyroidism

Subclinical hypothyroidism is commonly over-diagnosed, and treatment with thyroid hormone replacement, levothyroxine, has been shown to provide little, if any, benefit in terms of quality of life or relief of thyroid-related symptoms for these patients.

The treatment is meanwhile associated with burdens including cost and lifestyle adjustments, and one guideline panel recently issued a strong recommendation against routine levothyroxine use in most adults with subclinical hypothyroidism.

Nevertheless, levothyroxine treatment has soared in popularity and become one of the most commonly prescribed drugs in the United States.

With research lacking on one key solution of discontinuation of the therapy, Dr. Maraka, who is part of the Division of Endocrinology and Metabolism at the University of Arkansas for Medical Sciences, Little Rock, and colleagues conducted a double-blind, placebo-controlled trial at the Central Arkansas Veterans Healthcare System. In total, 50 patients treated for subclinical hypothyroidism were randomized 1:1 to continue receiving levothyroxine (25-75 mcg daily) or to discontinue treatment and receive a placebo instead, with a planned 6-month follow-up.

In the current interim analysis, Dr. Maraka reported results for the first 40 patients, including 20 randomized to levothyroxine and 20 to discontinuation.

There were no significant differences between the discontinuation and levothyroxine groups at baseline, which were of a similar age (66.2 vs. 70.8 years) and gender (75% women vs. 85% men).

The groups had similar baseline thyroid-stimulating hormone (TSH) levels (3.0 vs. 2.6 mIU/L), free T4 (both 0.9 ng/dL), thyroid peroxidase antibody positivity (17% vs. 11%), and similar clinical symptoms. All patients had at least one elevated TSH reading prior to starting levothyroxine.

With a follow-up of 6-8 weeks, 36.8% of patients in the discontinuation group had subclinical hypothyroidism, compared with 10% of patients who remained on levothyroxine (P = .0648), TSH levels were 5.5 versus 2.7 mIU/L (P = .001) and free T4 levels were 0.8 versus 0.9 ng/dL (P = .011).
 

No differences in symptoms, quality of life between groups

Importantly, there were no significant differences between the discontinuation versus levothyroxine groups in terms of symptoms, and even some improvements with discontinuation, including Thyroid-Specific Quality of Life Patient-Reported Outcome (ThyPRO)-Hypothyroid Symptoms score (4.6 reduction vs. 2.2 increase), tiredness (2.6 reduction vs. 1.1 increase), and EuroQoL 5-Dimension Self-Report Questionnaire (EQ-5D) quality of life score, for which there were no differences between groups.

There were no reports of overt hypothyroidism; hyperthyroidism; cardiovascular events including atrial fibrillation, stroke, or heart failure; osteoporotic fractures; or deaths.

One patient in the discontinuation group had a TSH level of 11 mIU/L at 6-8 weeks and switched to open-label levothyroxine 75 mcg daily. Another patient in the discontinuation group switched to open-label levothyroxine 75 mcg daily at 10 weeks due to fatigue; however, the patient was diagnosed with metastatic colon cancer 1 month later.

The finding that only about a third of patients who discontinued levothyroxine developed subclinical hypothyroidism was lower than expected, Dr. Maraka noted.

“This was ... unexpected ... for us,” she said. “We were expecting a larger number of patients to develop hypothyroidism, but to our surprise, that was not the case.”

“But what is more important is that there was no difference in the quality of life measures,” she added. “If anything, the placebo group was a little better, though the [differences] were not statistically significant.”

Dr. Maraka also noted that in further research and a final 6-month analysis, the authors will look at factors associated with developing subclinical hypothyroidism after treatment discontinuation, among other issues.
 

Discontinuation of levothyroxine is manageable

The results are encouraging, as they provide assurance that discontinuation of levothyroxine is manageable.

“This research will pave the way for initiatives to promote levothyroxine deprescription and implementation of evidence-based care for patients with subclinical hypothyroidism,” she said.

In further comments, Dr. Hennessey noted that the dilemma of having patients on levothyroxine who may not be benefitting from treatment is “significant,” with patients sometimes reluctant to discontinue treatment due to concerns of developing hypothyroidism-associated symptoms such as brain fog and weight gain.

He noted, however, that “many with mildly elevated TSH actually go on to normalize with time, so they are not really hypothyroid, [and] if we remove thyroxine from people with normal thyroid function, they will remain normal.”

Dr. Maraka has reported no relevant financial relationships. Dr. Hennessey has reported consulting for pharmaceutical companies to design clinical studies for thyroid medications.

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

MONTREAL – Patients who discontinue levothyroxine for subclinical hypothyroidism may gravitate towards becoming mildly hypothyroid again, but they importantly show no differences in terms of symptoms and quality of life – and sometimes show even improvement – compared with those who continue treatment, new research shows.

“Our results show feasibility of patient enrollment and safety of discontinuing levothyroxine in patients with subclinical hypothyroidism,” said first author Spyridoula Maraka, MD, when presenting the findings at the American Thyroid Association annual meeting.

Recommendations against levothyroxine for subclinical hypothyroidism

Subclinical hypothyroidism is commonly over-diagnosed, and treatment with thyroid hormone replacement, levothyroxine, has been shown to provide little, if any, benefit in terms of quality of life or relief of thyroid-related symptoms for these patients.

The treatment is meanwhile associated with burdens including cost and lifestyle adjustments, and one guideline panel recently issued a strong recommendation against routine levothyroxine use in most adults with subclinical hypothyroidism.

Nevertheless, levothyroxine treatment has soared in popularity and become one of the most commonly prescribed drugs in the United States.

With research lacking on one key solution of discontinuation of the therapy, Dr. Maraka, who is part of the Division of Endocrinology and Metabolism at the University of Arkansas for Medical Sciences, Little Rock, and colleagues conducted a double-blind, placebo-controlled trial at the Central Arkansas Veterans Healthcare System. In total, 50 patients treated for subclinical hypothyroidism were randomized 1:1 to continue receiving levothyroxine (25-75 mcg daily) or to discontinue treatment and receive a placebo instead, with a planned 6-month follow-up.

In the current interim analysis, Dr. Maraka reported results for the first 40 patients, including 20 randomized to levothyroxine and 20 to discontinuation.

There were no significant differences between the discontinuation and levothyroxine groups at baseline, which were of a similar age (66.2 vs. 70.8 years) and gender (75% women vs. 85% men).

The groups had similar baseline thyroid-stimulating hormone (TSH) levels (3.0 vs. 2.6 mIU/L), free T4 (both 0.9 ng/dL), thyroid peroxidase antibody positivity (17% vs. 11%), and similar clinical symptoms. All patients had at least one elevated TSH reading prior to starting levothyroxine.

With a follow-up of 6-8 weeks, 36.8% of patients in the discontinuation group had subclinical hypothyroidism, compared with 10% of patients who remained on levothyroxine (P = .0648), TSH levels were 5.5 versus 2.7 mIU/L (P = .001) and free T4 levels were 0.8 versus 0.9 ng/dL (P = .011).
 

No differences in symptoms, quality of life between groups

Importantly, there were no significant differences between the discontinuation versus levothyroxine groups in terms of symptoms, and even some improvements with discontinuation, including Thyroid-Specific Quality of Life Patient-Reported Outcome (ThyPRO)-Hypothyroid Symptoms score (4.6 reduction vs. 2.2 increase), tiredness (2.6 reduction vs. 1.1 increase), and EuroQoL 5-Dimension Self-Report Questionnaire (EQ-5D) quality of life score, for which there were no differences between groups.

There were no reports of overt hypothyroidism; hyperthyroidism; cardiovascular events including atrial fibrillation, stroke, or heart failure; osteoporotic fractures; or deaths.

One patient in the discontinuation group had a TSH level of 11 mIU/L at 6-8 weeks and switched to open-label levothyroxine 75 mcg daily. Another patient in the discontinuation group switched to open-label levothyroxine 75 mcg daily at 10 weeks due to fatigue; however, the patient was diagnosed with metastatic colon cancer 1 month later.

The finding that only about a third of patients who discontinued levothyroxine developed subclinical hypothyroidism was lower than expected, Dr. Maraka noted.

“This was ... unexpected ... for us,” she said. “We were expecting a larger number of patients to develop hypothyroidism, but to our surprise, that was not the case.”

“But what is more important is that there was no difference in the quality of life measures,” she added. “If anything, the placebo group was a little better, though the [differences] were not statistically significant.”

Dr. Maraka also noted that in further research and a final 6-month analysis, the authors will look at factors associated with developing subclinical hypothyroidism after treatment discontinuation, among other issues.
 

Discontinuation of levothyroxine is manageable

The results are encouraging, as they provide assurance that discontinuation of levothyroxine is manageable.

“This research will pave the way for initiatives to promote levothyroxine deprescription and implementation of evidence-based care for patients with subclinical hypothyroidism,” she said.

In further comments, Dr. Hennessey noted that the dilemma of having patients on levothyroxine who may not be benefitting from treatment is “significant,” with patients sometimes reluctant to discontinue treatment due to concerns of developing hypothyroidism-associated symptoms such as brain fog and weight gain.

He noted, however, that “many with mildly elevated TSH actually go on to normalize with time, so they are not really hypothyroid, [and] if we remove thyroxine from people with normal thyroid function, they will remain normal.”

Dr. Maraka has reported no relevant financial relationships. Dr. Hennessey has reported consulting for pharmaceutical companies to design clinical studies for thyroid medications.

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

MONTREAL – Patients who discontinue levothyroxine for subclinical hypothyroidism may gravitate towards becoming mildly hypothyroid again, but they importantly show no differences in terms of symptoms and quality of life – and sometimes show even improvement – compared with those who continue treatment, new research shows.

“Our results show feasibility of patient enrollment and safety of discontinuing levothyroxine in patients with subclinical hypothyroidism,” said first author Spyridoula Maraka, MD, when presenting the findings at the American Thyroid Association annual meeting.

Recommendations against levothyroxine for subclinical hypothyroidism

Subclinical hypothyroidism is commonly over-diagnosed, and treatment with thyroid hormone replacement, levothyroxine, has been shown to provide little, if any, benefit in terms of quality of life or relief of thyroid-related symptoms for these patients.

The treatment is meanwhile associated with burdens including cost and lifestyle adjustments, and one guideline panel recently issued a strong recommendation against routine levothyroxine use in most adults with subclinical hypothyroidism.

Nevertheless, levothyroxine treatment has soared in popularity and become one of the most commonly prescribed drugs in the United States.

With research lacking on one key solution of discontinuation of the therapy, Dr. Maraka, who is part of the Division of Endocrinology and Metabolism at the University of Arkansas for Medical Sciences, Little Rock, and colleagues conducted a double-blind, placebo-controlled trial at the Central Arkansas Veterans Healthcare System. In total, 50 patients treated for subclinical hypothyroidism were randomized 1:1 to continue receiving levothyroxine (25-75 mcg daily) or to discontinue treatment and receive a placebo instead, with a planned 6-month follow-up.

In the current interim analysis, Dr. Maraka reported results for the first 40 patients, including 20 randomized to levothyroxine and 20 to discontinuation.

There were no significant differences between the discontinuation and levothyroxine groups at baseline, which were of a similar age (66.2 vs. 70.8 years) and gender (75% women vs. 85% men).

The groups had similar baseline thyroid-stimulating hormone (TSH) levels (3.0 vs. 2.6 mIU/L), free T4 (both 0.9 ng/dL), thyroid peroxidase antibody positivity (17% vs. 11%), and similar clinical symptoms. All patients had at least one elevated TSH reading prior to starting levothyroxine.

With a follow-up of 6-8 weeks, 36.8% of patients in the discontinuation group had subclinical hypothyroidism, compared with 10% of patients who remained on levothyroxine (P = .0648), TSH levels were 5.5 versus 2.7 mIU/L (P = .001) and free T4 levels were 0.8 versus 0.9 ng/dL (P = .011).
 

No differences in symptoms, quality of life between groups

Importantly, there were no significant differences between the discontinuation versus levothyroxine groups in terms of symptoms, and even some improvements with discontinuation, including Thyroid-Specific Quality of Life Patient-Reported Outcome (ThyPRO)-Hypothyroid Symptoms score (4.6 reduction vs. 2.2 increase), tiredness (2.6 reduction vs. 1.1 increase), and EuroQoL 5-Dimension Self-Report Questionnaire (EQ-5D) quality of life score, for which there were no differences between groups.

There were no reports of overt hypothyroidism; hyperthyroidism; cardiovascular events including atrial fibrillation, stroke, or heart failure; osteoporotic fractures; or deaths.

One patient in the discontinuation group had a TSH level of 11 mIU/L at 6-8 weeks and switched to open-label levothyroxine 75 mcg daily. Another patient in the discontinuation group switched to open-label levothyroxine 75 mcg daily at 10 weeks due to fatigue; however, the patient was diagnosed with metastatic colon cancer 1 month later.

The finding that only about a third of patients who discontinued levothyroxine developed subclinical hypothyroidism was lower than expected, Dr. Maraka noted.

“This was ... unexpected ... for us,” she said. “We were expecting a larger number of patients to develop hypothyroidism, but to our surprise, that was not the case.”

“But what is more important is that there was no difference in the quality of life measures,” she added. “If anything, the placebo group was a little better, though the [differences] were not statistically significant.”

Dr. Maraka also noted that in further research and a final 6-month analysis, the authors will look at factors associated with developing subclinical hypothyroidism after treatment discontinuation, among other issues.
 

Discontinuation of levothyroxine is manageable

The results are encouraging, as they provide assurance that discontinuation of levothyroxine is manageable.

“This research will pave the way for initiatives to promote levothyroxine deprescription and implementation of evidence-based care for patients with subclinical hypothyroidism,” she said.

In further comments, Dr. Hennessey noted that the dilemma of having patients on levothyroxine who may not be benefitting from treatment is “significant,” with patients sometimes reluctant to discontinue treatment due to concerns of developing hypothyroidism-associated symptoms such as brain fog and weight gain.

He noted, however, that “many with mildly elevated TSH actually go on to normalize with time, so they are not really hypothyroid, [and] if we remove thyroxine from people with normal thyroid function, they will remain normal.”

Dr. Maraka has reported no relevant financial relationships. Dr. Hennessey has reported consulting for pharmaceutical companies to design clinical studies for thyroid medications.

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

MONTREAL – Amid common patient concerns about weight gain in the treatment of hyperthyroidism, findings from a large study suggest the therapy with the most favorable survival rate – radioiodine – is not associated with an increased risk of weight gain or obesity.

“EGRET is the first large study using population-based linked community and hospital data to elucidate the long-term consequences of treatment modalities for hyperthyroidism,” said co-author Kristien Boelaert, MD, PhD, while presenting the research at the American Thyroid Association annual meeting.

“The administration of [radioiodine] for hyperthyroidism is associated with a survival benefit for patients with hyperthyroidism and is not associated with increased risks of becoming obese,” Dr. Boelaert, a professor of endocrinology and consultant endocrinologist with the Institute of Applied Health Research, University of Birmingham, England, told this news organization.

However, “overall, there was a nearly 10% risk of major adverse cardiac events [MACE] in patients with hyperthyroidism regardless of the treatment modality used,” she noted.

Commenting on the findings, Jonathon O. Russell, MD, said the study offers surprising – but encouraging – results.

The discovery that radioiodine shows no increase in weight gain “contradicts numerous previous studies which have consistently demonstrated weight gain following definitive radioiodine,” Dr. Russell told this news organization.

Overall, however, “these findings reinforce our knowledge that definitive treatment of an overactive thyroid leads to a longer life – even if there is some weight gain,” added Dr. Russell, who is chief of the Division of Head and Neck Endocrine Surgery at Johns Hopkins, Baltimore.
 

Hyperthyroidism associated with serious long-term cardiometabolic issues

Hyperthyroidism is associated with serious long-term cardiovascular and metabolic morbidity and mortality, and treatment is therefore essential. However, the swing to hypothyroidism that often occurs afterward commonly results in regaining the weight lost due to the hyperthyroidism, if not more, potentially leading to obesity and its attendant health risks.

To investigate those risks in relation to the three key hyperthyroidism treatments, the authors conducted the EGRET trial. They identified 62,474 patients in the United Kingdom population-based electronic health record database who had newly diagnosed hyperthyroidism and were treated with antithyroid drugs (73.4%), radioiodine (19.5%), or thyroidectomy (7.1%) between April 1997 and December 2015.

Exclusion criteria included those with less than 6 months of antithyroid drugs as the only form of treatment, thyroid cancer, or pregnancy during the first episode.

With a median follow-up of about 8 years, those who were treated with thyroidectomy had a significantly increased risk of gaining weight, compared with the general population (P < .001), and of developing obesity (body mass index > 30 kg/m2; P = .003), while the corresponding increases with antithyroid drugs and radioiodine were not significantly different, compared with the general population over the same period.

In terms of survival, with an average follow-up of about 11 years per person, about 14% of the cohort died, with rates of 14.4% in the antithyroid drug group, 15.8% in the radioiodine group, and 9.2% in the thyroidectomy group.

Mortality rates were further assessed based on an average treatment effects analysis in which the average change was estimated, compared with the index of antithyroid drugs – for instance, if all were treated instead with radioiodine. In that extension of life analysis, those treated with radioiodine could be expected to die, on average, 1.2 years later than those taking antithyroid drugs (P < .001), while those treated with thyroidectomy would be expected to die 0.6 years later, which was not statistically significant.

Using the same average treatment effects analysis, Dr. Boelaert noted, “we found a slightly increased risk of major adverse cardiovascular events following radioiodine, compared with antithyroid drugs; [however], the risk was very small and may not be clinically relevant.”

“Previous data from our and other groups have shown reduced risks of mortality and cardiovascular death following radioiodine-induced hypothyroidism, although this is not confirmed in all studies.”
 

Weight gain after hyperthyroid treatment drives concerns

The findings are important because weight gain associated with hyperthyroidism treatment is no small matter for many patients, even prompting a lack of adherence to therapy for some, despite its importance, Dr. Boelaert noted.

“Since the majority of patients lose weight as a consequence of being hyperthyroid, it can be expected that they will at least regain the lost weight and possibly even have a weight overshoot,” she explained. “Indeed, many patients are reluctant to accept definitive treatment with surgery or radioiodine out of fear of weight gain.”

“This may cause difficulties to some patients who occasionally may even stop taking antithyroid drugs to prevent this weight regain. Such lack of adherence may have dire consequences and is likely a contributing factor to the increased mortality in these patients,” she observed.

In a previous study of 1,373 patients, Dr. Boelaert and colleagues found that men treated for hyperthyroidism gained an average of 8.0 kg (17.6 lb), and women gained an average of 5.5 kg (12.1 lb).

Compared with the background population, men were significantly more likely to gain weight over the study period (odds ratio, 1.7; P < .001) as were women (OR, 1.3; P < .001). Also in that study, radioiodine was associated with greater weight gain (0.6 kg; P < .001), compared with antithyroid drug treatment alone.

Dr. Russell added that even when weight gain does occur, the payoff of having treated the potentially serious state of hyperthyroidism is a highly beneficial trade-off.

Ultimately, “the goal of treating any patient with Graves’ should be to get them to become hypothyroid as quickly as possible,” he said. “Patients have options, and all of these options can be safe in the right situation.”

“It is unrealistic to think that going from a hyperthyroid state to a low thyroid state will not result in weight gain for many patients,” Dr. Russell added. “But the key point is that overall health is better despite this weight gain.”

Dr. Boelaert has disclosed consulting fees paid to the University of Birmingham by Lilly and Eisai. Dr. Russell has reported no relevant financial relationships.

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

MONTREAL – Amid common patient concerns about weight gain in the treatment of hyperthyroidism, findings from a large study suggest the therapy with the most favorable survival rate – radioiodine – is not associated with an increased risk of weight gain or obesity.

“EGRET is the first large study using population-based linked community and hospital data to elucidate the long-term consequences of treatment modalities for hyperthyroidism,” said co-author Kristien Boelaert, MD, PhD, while presenting the research at the American Thyroid Association annual meeting.

“The administration of [radioiodine] for hyperthyroidism is associated with a survival benefit for patients with hyperthyroidism and is not associated with increased risks of becoming obese,” Dr. Boelaert, a professor of endocrinology and consultant endocrinologist with the Institute of Applied Health Research, University of Birmingham, England, told this news organization.

However, “overall, there was a nearly 10% risk of major adverse cardiac events [MACE] in patients with hyperthyroidism regardless of the treatment modality used,” she noted.

Commenting on the findings, Jonathon O. Russell, MD, said the study offers surprising – but encouraging – results.

The discovery that radioiodine shows no increase in weight gain “contradicts numerous previous studies which have consistently demonstrated weight gain following definitive radioiodine,” Dr. Russell told this news organization.

Overall, however, “these findings reinforce our knowledge that definitive treatment of an overactive thyroid leads to a longer life – even if there is some weight gain,” added Dr. Russell, who is chief of the Division of Head and Neck Endocrine Surgery at Johns Hopkins, Baltimore.
 

Hyperthyroidism associated with serious long-term cardiometabolic issues

Hyperthyroidism is associated with serious long-term cardiovascular and metabolic morbidity and mortality, and treatment is therefore essential. However, the swing to hypothyroidism that often occurs afterward commonly results in regaining the weight lost due to the hyperthyroidism, if not more, potentially leading to obesity and its attendant health risks.

To investigate those risks in relation to the three key hyperthyroidism treatments, the authors conducted the EGRET trial. They identified 62,474 patients in the United Kingdom population-based electronic health record database who had newly diagnosed hyperthyroidism and were treated with antithyroid drugs (73.4%), radioiodine (19.5%), or thyroidectomy (7.1%) between April 1997 and December 2015.

Exclusion criteria included those with less than 6 months of antithyroid drugs as the only form of treatment, thyroid cancer, or pregnancy during the first episode.

With a median follow-up of about 8 years, those who were treated with thyroidectomy had a significantly increased risk of gaining weight, compared with the general population (P < .001), and of developing obesity (body mass index > 30 kg/m2; P = .003), while the corresponding increases with antithyroid drugs and radioiodine were not significantly different, compared with the general population over the same period.

In terms of survival, with an average follow-up of about 11 years per person, about 14% of the cohort died, with rates of 14.4% in the antithyroid drug group, 15.8% in the radioiodine group, and 9.2% in the thyroidectomy group.

Mortality rates were further assessed based on an average treatment effects analysis in which the average change was estimated, compared with the index of antithyroid drugs – for instance, if all were treated instead with radioiodine. In that extension of life analysis, those treated with radioiodine could be expected to die, on average, 1.2 years later than those taking antithyroid drugs (P < .001), while those treated with thyroidectomy would be expected to die 0.6 years later, which was not statistically significant.

Using the same average treatment effects analysis, Dr. Boelaert noted, “we found a slightly increased risk of major adverse cardiovascular events following radioiodine, compared with antithyroid drugs; [however], the risk was very small and may not be clinically relevant.”

“Previous data from our and other groups have shown reduced risks of mortality and cardiovascular death following radioiodine-induced hypothyroidism, although this is not confirmed in all studies.”
 

Weight gain after hyperthyroid treatment drives concerns

The findings are important because weight gain associated with hyperthyroidism treatment is no small matter for many patients, even prompting a lack of adherence to therapy for some, despite its importance, Dr. Boelaert noted.

“Since the majority of patients lose weight as a consequence of being hyperthyroid, it can be expected that they will at least regain the lost weight and possibly even have a weight overshoot,” she explained. “Indeed, many patients are reluctant to accept definitive treatment with surgery or radioiodine out of fear of weight gain.”

“This may cause difficulties to some patients who occasionally may even stop taking antithyroid drugs to prevent this weight regain. Such lack of adherence may have dire consequences and is likely a contributing factor to the increased mortality in these patients,” she observed.

In a previous study of 1,373 patients, Dr. Boelaert and colleagues found that men treated for hyperthyroidism gained an average of 8.0 kg (17.6 lb), and women gained an average of 5.5 kg (12.1 lb).

Compared with the background population, men were significantly more likely to gain weight over the study period (odds ratio, 1.7; P < .001) as were women (OR, 1.3; P < .001). Also in that study, radioiodine was associated with greater weight gain (0.6 kg; P < .001), compared with antithyroid drug treatment alone.

Dr. Russell added that even when weight gain does occur, the payoff of having treated the potentially serious state of hyperthyroidism is a highly beneficial trade-off.

Ultimately, “the goal of treating any patient with Graves’ should be to get them to become hypothyroid as quickly as possible,” he said. “Patients have options, and all of these options can be safe in the right situation.”

“It is unrealistic to think that going from a hyperthyroid state to a low thyroid state will not result in weight gain for many patients,” Dr. Russell added. “But the key point is that overall health is better despite this weight gain.”

Dr. Boelaert has disclosed consulting fees paid to the University of Birmingham by Lilly and Eisai. Dr. Russell has reported no relevant financial relationships.

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

MONTREAL – Amid common patient concerns about weight gain in the treatment of hyperthyroidism, findings from a large study suggest the therapy with the most favorable survival rate – radioiodine – is not associated with an increased risk of weight gain or obesity.

“EGRET is the first large study using population-based linked community and hospital data to elucidate the long-term consequences of treatment modalities for hyperthyroidism,” said co-author Kristien Boelaert, MD, PhD, while presenting the research at the American Thyroid Association annual meeting.

“The administration of [radioiodine] for hyperthyroidism is associated with a survival benefit for patients with hyperthyroidism and is not associated with increased risks of becoming obese,” Dr. Boelaert, a professor of endocrinology and consultant endocrinologist with the Institute of Applied Health Research, University of Birmingham, England, told this news organization.

However, “overall, there was a nearly 10% risk of major adverse cardiac events [MACE] in patients with hyperthyroidism regardless of the treatment modality used,” she noted.

Commenting on the findings, Jonathon O. Russell, MD, said the study offers surprising – but encouraging – results.

The discovery that radioiodine shows no increase in weight gain “contradicts numerous previous studies which have consistently demonstrated weight gain following definitive radioiodine,” Dr. Russell told this news organization.

Overall, however, “these findings reinforce our knowledge that definitive treatment of an overactive thyroid leads to a longer life – even if there is some weight gain,” added Dr. Russell, who is chief of the Division of Head and Neck Endocrine Surgery at Johns Hopkins, Baltimore.
 

Hyperthyroidism associated with serious long-term cardiometabolic issues

Hyperthyroidism is associated with serious long-term cardiovascular and metabolic morbidity and mortality, and treatment is therefore essential. However, the swing to hypothyroidism that often occurs afterward commonly results in regaining the weight lost due to the hyperthyroidism, if not more, potentially leading to obesity and its attendant health risks.

To investigate those risks in relation to the three key hyperthyroidism treatments, the authors conducted the EGRET trial. They identified 62,474 patients in the United Kingdom population-based electronic health record database who had newly diagnosed hyperthyroidism and were treated with antithyroid drugs (73.4%), radioiodine (19.5%), or thyroidectomy (7.1%) between April 1997 and December 2015.

Exclusion criteria included those with less than 6 months of antithyroid drugs as the only form of treatment, thyroid cancer, or pregnancy during the first episode.

With a median follow-up of about 8 years, those who were treated with thyroidectomy had a significantly increased risk of gaining weight, compared with the general population (P < .001), and of developing obesity (body mass index > 30 kg/m2; P = .003), while the corresponding increases with antithyroid drugs and radioiodine were not significantly different, compared with the general population over the same period.

In terms of survival, with an average follow-up of about 11 years per person, about 14% of the cohort died, with rates of 14.4% in the antithyroid drug group, 15.8% in the radioiodine group, and 9.2% in the thyroidectomy group.

Mortality rates were further assessed based on an average treatment effects analysis in which the average change was estimated, compared with the index of antithyroid drugs – for instance, if all were treated instead with radioiodine. In that extension of life analysis, those treated with radioiodine could be expected to die, on average, 1.2 years later than those taking antithyroid drugs (P < .001), while those treated with thyroidectomy would be expected to die 0.6 years later, which was not statistically significant.

Using the same average treatment effects analysis, Dr. Boelaert noted, “we found a slightly increased risk of major adverse cardiovascular events following radioiodine, compared with antithyroid drugs; [however], the risk was very small and may not be clinically relevant.”

“Previous data from our and other groups have shown reduced risks of mortality and cardiovascular death following radioiodine-induced hypothyroidism, although this is not confirmed in all studies.”
 

Weight gain after hyperthyroid treatment drives concerns

The findings are important because weight gain associated with hyperthyroidism treatment is no small matter for many patients, even prompting a lack of adherence to therapy for some, despite its importance, Dr. Boelaert noted.

“Since the majority of patients lose weight as a consequence of being hyperthyroid, it can be expected that they will at least regain the lost weight and possibly even have a weight overshoot,” she explained. “Indeed, many patients are reluctant to accept definitive treatment with surgery or radioiodine out of fear of weight gain.”

“This may cause difficulties to some patients who occasionally may even stop taking antithyroid drugs to prevent this weight regain. Such lack of adherence may have dire consequences and is likely a contributing factor to the increased mortality in these patients,” she observed.

In a previous study of 1,373 patients, Dr. Boelaert and colleagues found that men treated for hyperthyroidism gained an average of 8.0 kg (17.6 lb), and women gained an average of 5.5 kg (12.1 lb).

Compared with the background population, men were significantly more likely to gain weight over the study period (odds ratio, 1.7; P < .001) as were women (OR, 1.3; P < .001). Also in that study, radioiodine was associated with greater weight gain (0.6 kg; P < .001), compared with antithyroid drug treatment alone.

Dr. Russell added that even when weight gain does occur, the payoff of having treated the potentially serious state of hyperthyroidism is a highly beneficial trade-off.

Ultimately, “the goal of treating any patient with Graves’ should be to get them to become hypothyroid as quickly as possible,” he said. “Patients have options, and all of these options can be safe in the right situation.”

“It is unrealistic to think that going from a hyperthyroid state to a low thyroid state will not result in weight gain for many patients,” Dr. Russell added. “But the key point is that overall health is better despite this weight gain.”

Dr. Boelaert has disclosed consulting fees paid to the University of Birmingham by Lilly and Eisai. Dr. Russell has reported no relevant financial relationships.

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