Riding the Cutting Edge of Cardiac Arrest Care

In 1960, Kouwenhoven et al. published an article describing closed-chest cardiac massage for cardiac resuscitation. “Anyone, anywhere, can now initiate cardiac resuscitative procedures,” the researchers explained. “All that is needed are two hands.”1 More than 65 years later, outcomes after cardiac arrest remain dismal. About 350,000 people in the United States experience an out-of-hospital cardiac arrest (OHCA) annually.1 Nearly 90% of patients die, and neurologically intact survival after OHCA is less than 8%.2 Outcomes are even worse for patients from racial and ethnic minority groups.3 Resuscitation experts acknowledge that progress has been slow. “The literature has grown but has not accelerated significantly compared to other areas of medicine, like oncology,” said John C. Greenwood, MD, MS, an emergency physician and critical intensivist at the Hospital of the University of Pennsylvania and director of the Penn Center for Resuscitation Science. Funding for cardiac arrest research has declined since 2010, he added. But the landscape of cardiac arrest is shifting. The U.S. opioid crisis is driving more “nonshockable” pulseless electrical activity arrests, Dr Greenwood observed, and the 2025 American Heart Association (AHA) guidelines emphasize naloxone and lay-rescuer education. Meanwhile, new technologies are expanding treatment options. “If you look at the current stats, why wouldn't you want to try and improve them?” asked Keith Lurie, MD, a professor of emergency medicine and internal medicine at the University of Minnesota and chief medical officer at AdvancedCPR Solutions. CPR should start with a pair of hands, “but moving to better tools is fundamental, and the tools have to make sense physiologically,” he said. Promising mechanical adjuncts include automated chest compression devices, impedance threshold devices, and extracorporeal membrane oxygenation for refractory cardiac arrest.4,5 Ultrasound methods to visualize the heart, like transesophageal echocardiography, may ultimately help guide CPR in real time. But the need for more innovation is urgent. “The status quo is not working,” Dr Lurie said. As resuscitation science evolves, others underscore the importance of randomized clinical trials (RCTs) before adoption. Scott D. Weingart, MD, FCCM, is a professor of emergency medicine at Nassau University Medical Center in East Meadow, New York. Some therapies have good evidence but face logistical barriers, he said. For example, dual-sequential defibrillation has shown patient benefit but requires training, access to two defibrillators, and coordination. “That's the right kind of cutting edge in my mind,” said Dr Weingart. Therapies backed only by animal studies warrant caution. But OHCA populations are highly heterogeneous, and controlled clinical trials are difficult to conduct.5 Waiting for indisputable evidence is too long, Dr Weingart said. “It's a fine balance.” In 2026, methylene blue, nitroprusside, and head-up CPR stand out as emerging resuscitation approaches. “It's important to understand how these interventions work,” noted Dr Greenwood. But because of limited human data, “they are not yet ready for prime time.” Methylene Blue This compound works as a nitric oxide scavenger, according to Dr Greenwood. It may counteract vasoplegia after return of spontaneous circulation (ROSC). A 2025 meta-analysis in Shock concluded it is too early to recommend methylene blue in cardiac arrest, he said.7 Dr Weingart sees a selective role for methylene blue, in patients who are intractably hypotensive. Using an arterial line, he will monitor the patient's diastolic blood pressure. If CPR and epinephrine fail to raise it to about 30-40 mmHg, he may add methylene blue to try and improve the chance of ROSC. Sodium Nitroprusside Nitroprusside “does the exact opposite of methylene blue,” continued Dr Weingart, “so both of them can't be okay to give indiscriminately.” Nitroprusside generates nitric oxide and may improve perfusion by dilating small blood vessels. “While conceptually I like it, it's really hard to use, it's hard to store, it's hard to dose,” said Dr Lurie. He notes that nitroprusside has shown profound benefit in the in-hospital setting via direct intracoronary injection. Head-Up CPR This method aims to improve circulation and lower intracranial pressure by pumping blood “uphill.” Head-up CPR combines an impedance threshold device, automated CPR, and controlled elevation of the head. Technique is critical. “You can't just put the head up with a pillow or wedge. You'll hurt somebody that way,” cautioned Dr Lurie, who developed the EleGARD positioning device. Two observational studies totaling more than 500 OHCA patients treated with head-up CPR by first responders reported higher rates of neurologically favorable survival compared with those who received conventional CPR, regardless of presenting rhythm.6,7 Preliminary data presented at the AHA Resuscitation Science Symposium in November 2025 showed a similar benefit in more than 3,700 OHCA patients from multiple EMS systems.8 Dr Lurie framed the research questions he hopes to address in a future RCT: “How do you optimize the technology? What does that look like? How do you teach it effectively? And how do you drive adoption?” The Bottom Line All three approaches are time-sensitive, reflected Dr Lurie. “If you do not have systems that are really focused on getting to the patient quickly...then you can have the greatest advances in the world. They're not going to do anything,” he said. True resuscitation excellence requires a systemwide commitment to improvement, agreed Dr Weingart. Emergency physicians can take matters into their own two hands, just as Kouwenhoven and colleagues envisioned. “Part of the job is not only practicing good medicine but trying to figure out ways to practice better medicine,” said Dr Greenwood. “So, be curious.” “What you do at the bedside actually matters,” Dr Greenwood emphasized. “The future of resuscitation science relies on physicians to advance the frontiers of both medical research and clinical practice.”