Probe Patients or Leave Well Enough Alone?
The findings have ramifications for clinicians who may be caring for patients who survive cardiac arrest, said Lance B. Becker, MD, professor and chair, Department of Emergency Medicine, Donald & Barbara Zucker School of Medicine at Hofstra/Northwell, Manhasset, New York, and chair, Department of Emergency Medicine at North Shore University Hospital, Manhasset, and Long Island Jewish Medical Center, Queens, New York.
“I’ve talked with a lot of patients who have had some kind of recalled experience around cardiac arrest and some who have had zero recall, as well, like in the paper,” he told this news organization. “The ones who do have an experience are sometimes mystified by it and have questions. And very often, clinicians don’t want to listen, don’t think it’s important, and downplay it.”
“I think it is important, and when people have important things happen to them, it’s really imperative that doctors listen, learn, and respond,” he said. “When I started in this field a long time ago, there were so few survivors that there wasn’t even a concept of survivorship,” he said.
Dr. Becker noted that it’s not uncommon for cardiac arrest survivors to have depression, problems with executive function, or a small brain injury they need to recover from. “Now survivorship organizations are springing up that these people can turn to, but clinicians still need to become more aware and sensitive to this.”
Not all are. “I had a number of patients who said I was the only doctor who ever asked them about what they experienced,” he recalled. “I was a young doctor at the time and didn’t exactly know what to say to them, but they were just happy to have a doctor who would listen to them and not be afraid to hear what they had to say.”
Recognizing that support is an issue, the American Heart Association released a scientific statement in 2020 on sudden cardiac arrest survivorship, which “expands the cardiac arrest resuscitation system of care to include patients, caregivers, and rehabilitative healthcare partnerships, which are central to cardiac survivorship.”
Soar has a more nuanced view of survivorship support, however. “I suspect some people are very glad to be alive, and that trying to dig deep and bring things out may actually be harmful,” he said. “It’s not as clear cut as everybody thinks.”
He noted that follow-up and rehabilitation should be an option for people who specifically need it who would need to be identified. “But human beings are resilient, and while some people will require help, not everybody will,” he said.
Better CPR, New Treatments
Experts in emergency and intensive care medicine studying survival after cardiac arrest hope to find ways to save patients before too much damage is done to the brain and other organs from loss of oxygen, Dr. Parnia said. He is the lead author in a recent multidisciplinary consensus statement on guidelines and standards for the study of death and recalled experiences of death.
“One of my bugbears is that our survival outcomes from cardiac arrest resuscitation have not changed very much for 60 years because we haven’t developed new treatments and innovative methods,” he said. “Unlike the rest of medicine, we’re living in the past.”
Currently, his team is developing cocktails of treatments. These include hypothermic circulatory arrest — cooling the body to stop blood circulation and brain function for up to 40 minutes — and giving magnesium, a brain-protective treatment, to people whose hearts stop.
Dr. Becker would like to see optimal care of patients with cardiac arrest. “The first step is to increase blood flow with good CPR and then measure whether CPR is working,” he said. Adding that despite the availability of devices that provide feedback on the quality of CPR, they’re rarely used. He cited ultrasound devices that measure the blood flow generated during CPR, compression meter devices that go between the patient’s chest and the rescuer’s hands that gauge the rate and depth of compression, and invasive devices that measure blood pressure during CPR.
His group is trying to design even better devices, he said. “An example would be a little probe that you could pop on the neck that would study blood flow to the brain with ultrasound, so that while you were pumping on the person, you could see if you’re making them better or not.”
“We also have some preliminary data showing that the American Heart Association recommended position on the chest for doing CPR is not the perfect place for everybody,” he said. The 2020 AHA guidelines recommended the center of the lower half of the sternum. At the 2023 American College of Emergency Physicians meeting, Dr. Becker›s team at Hofstra/Northwell presented data on 175 video-recorded adult cardiac arrests in their emergency department over more than 2 years, 22 of which involved at least one change of compression location (for a total of 29 location changes). They found that 41% of compression location changes were associated with return of spontaneous circulation.
For about a third of people, the hands need to be repositioned slightly. “This is not anything that is taught to the public because you can only figure it out if you have some kind of sensor that will let you know how you’re doing. That’s very achievable. We could have that in the future on every ambulance and even in people’s homes.”
When the person arrives at the hospital, he said, “we can make it easier and more likely that they can be put on extracorporeal membrane oxygenation (ECMO). We do that on selected patients in our hospital, even though it’s very difficult to do, because we know that when it’s done properly, it can change survival rates dramatically, from maybe 10%-50%.”
Dr. Dr. Becker, like Dr. Parnia, also favors the development of drug cocktails, and his team has been experimenting with various combinations in animal models. “We think those two things together — ECMO and a drug cocktail — would be a very powerful one to two knock out for cardiac arrest,” he said. “We have a long way to go — 10 or 20 years. But most people around the world working in this area believe that will be the future.”
Dr. Parnia’s study on recalled death was supported by The John Templeton Foundation, Resuscitation Council (UK), and New York University Grossman School of Medicine, with research support staff provided by the UK’s National Institutes for Health Research. Soar is the editor of the journal Resuscitation and receives payment from the publisher Elsevier. Dr. Becker’s institute has received grants from Philips Medical Systems, NIH, Zoll Medical Corp, Nihon Kohden, PCORI, BrainCool, and United Therapeutics. He has received advisory/consultancy honoraria from NIH, Nihon Kohden, HP, and Philips, and he holds several patents in hypothermia induction and reperfusion therapies and several pending patents involving the use of medical slurries as human coolant devices to create reperfusion cocktails and measurement of respiratory quotient.
A version of this article appeared on Medscape.com.