This Week in Emergency Medicine — May 28, 2026

Welcome to This Week in Emergency Medicine. This week we're covering 10 notable papers spanning advances in cardiac arrest care, operational challenges in the ED and prehospital setting, and a look at the future of our specialty. Let's dive in.

Innovations in Cardiac Arrest Resuscitation

We start this week in the prehospital environment, with four new papers from the journal *Resuscitation* that challenge, refine, and expand our approach to out-of-hospital cardiac arrest.

First, a simulation study explores the potential of technology to solve one of the most intractable problems in resuscitation: the unwitnessed arrest [4]. Researchers in Western Australia modeled what would happen if consumer wearable devices, like smartwatches, could detect pulselessness and automatically notify EMS. In their region, two-thirds of EMS-attended arrests are unwitnessed, with a survival rate below one percent. The model estimated that if every unwitnessed arrest was converted to a device-witnessed arrest, survival in that group could jump from 0.5% to over 8%. Even with a more modest scenario—just 10% of patients wearing a device with 80% sensitivity—the model predicted a doubling of survival among unwitnessed arrests. This highlights a significant potential for public health impact as this technology becomes more common.

While technology may help us detect arrests sooner, managing the airway remains a core skill. For years, we've debated the best approach for providers with basic training. A new systematic review conducted for the International Liaison Committee on Resuscitation, or ILCOR, addressed this by comparing supraglottic airways, or SGAs, to traditional bag-valve-mask ventilation when used by BLS providers [2]. The review, which included three randomized trials and thirteen observational studies, found no significant difference in survival to hospital discharge or good neurologic outcomes. The certainty of this evidence was rated as low to very low. One trial did suggest a higher chest compression fraction with SGAs, but overall, the review concludes there is no evidence of benefit for SGAs over BVMs in this setting. This reinforces that effective BVM ventilation remains a critical and acceptable skill for BLS providers during resuscitation.

Beyond general principles, two other papers looked at specific interventions for distinct arrest populations. First, in Denmark, researchers examined the role of Community First Responders, or CFRs, in pediatric out-of-hospital cardiac arrests [3]. The study found that activating these volunteers was associated with earlier resuscitative efforts. Of the responders who arrived on scene, over half got there before EMS, and about 30% performed CPR. However, the experience came at a psychological cost: one-third of responders reported moderate to severe immediate distress, especially if they arrived before EMS or performed CPR on a young child. Despite this, nearly all of them—99 percent—remained willing to continue volunteering, suggesting that with proper support, CFR programs can be a vital, and resilient, part of the chain of survival for children.

Finally, a large, retrospective cohort study using a national United States database looked at naloxone administration during out-of-hospital cardiac arrest, stratifying by the patient's initial rhythm [5]. The study analyzed over 40,000 cases. After propensity score matching, the results were striking. For patients presenting in pulseless electrical activity, or PEA, receiving naloxone was associated with a roughly 50% increase in the odds of survival to hospital discharge. In contrast, for patients with shockable rhythms or asystole, naloxone administration showed no association with improved outcomes. The authors caution that this is a retrospective study and cannot prove causality. However, given the challenge of identifying opioid-associated arrests in the field, this finding suggests that the presenting rhythm of PEA could be a key indicator for patients who might benefit from naloxone.

Optimizing Prehospital and Emergency Department Operations

Next, we turn to the systems and processes that underpin our daily practice, with papers on triage, diagnostics, and patient flow.

In the prehospital setting, accurately identifying major trauma patients is crucial for getting them to the right center. A study in the *Emergency Medicine Journal* evaluated the real-world performance of the Major Trauma Triage Study, or MATTS, tool in the United Kingdom [1]. In a cohort of over 38,000 injured patients, the tool demonstrated a sensitivity of about 55% and a specificity of 94% for identifying major trauma. The authors note that this achieved an appropriate trade-off between undertriage and overtriage compared to previous economic modeling. Perhaps the most significant finding, however, was that documented adherence to using the tool was very low, at just over 6%. This suggests that even a well-designed tool is only effective if it's consistently used, highlighting a need for dedicated training and implementation science before wider rollout.

Once a patient arrives in the department, rapid and accurate diagnostics are paramount. A prospective, blinded study, also in the *Emergency Medicine Journal*, provides strong evidence for a practice many have already adopted: point-of-care ultrasound for deep vein thrombosis [7]. The study compared compression ultrasound performed by trained emergency physicians to the reference standard of radiologist-performed Doppler ultrasound in over 300 patients. The results were excellent. Emergency physician-performed ultrasound had a sensitivity of 97% and a specificity of over 99%. The inter-observer agreement was excellent. Critically, the workflow-based time-to-diagnosis was dramatically shorter: a median of 1 hour for the bedside ultrasound versus 4 hours for the formal study. This finding strongly supports the use of point-of-care ultrasound to expedite DVT diagnosis and potentially improve patient flow.

But even the fastest diagnostics can be stymied by system-level gridlock. A paper in this week's *Annals of Emergency Medicine* focuses on this critical issue with a title that says it all: 'A Dose of Delay: Emergency Department Boarding and Early Clinical Deterioration' [8]. While the full abstract was not available for this review, the title points to a crucial area of research: quantifying the harm that comes to our admitted patients who are stuck in the emergency department for hours or days waiting for an inpatient bed. It's a stark reminder that our care environment directly impacts patient safety.

Underpinning all of these operational components is the core value of professionalism. A new position statement from the National Association of EMS Physicians, published in *Prehospital Emergency Care*, provides a framework for this concept in the prehospital world [10]. The statement recommends that professionalism be treated as a core competency for all EMS personnel. It emphasizes that professional behavior builds public trust, promotes teamwork, and is essential for delivering patient-centered care, especially during times of crisis. The document calls for professionalism to be modeled by leaders and formally incorporated into initial training, continuing education, and quality improvement processes.

The Big Picture: Global Health and the Future of Training

Finally, we zoom out to look at two papers that frame the broader context and future of our practice.

A landmark analysis from the Global Burden of Disease Study, published in *The Lancet*, reveals the staggering scale of the global mental health crisis [9]. The report estimates there were 1.17 billion prevalent cases of mental disorders worldwide in 2023, an increase in the age-standardized prevalence rate of 24% since 1990. The impact on health is immense. Mental disorders have risen from the 12th to the 5th leading cause of disability-adjusted life years, or DALYs. And they are now the single leading cause of years lived with disability globally, accounting for over 17% of the total. Anxiety disorders and major depressive disorder are the primary drivers of this burden. For emergency clinicians on the front lines, these numbers are not an abstraction; they represent the patients presenting with acute crises that we see every single shift.

As the burden of disease evolves, so too must our training methods. A perspective piece in *Nature Medicine* raises a crucial caution about the integration of artificial intelligence into medical education [6]. The authors introduce the term 'never-skilling' to describe a potential risk: that trainees who rely on AI tools during their formative years may fail to develop the foundational clinical reasoning skills necessary for safe, independent practice. This is distinct from deskilling in experienced clinicians. The concern is that if a trainee's first instinct is to ask an AI, they may never build the cognitive scaffolding to solve problems on their own. The authors are not against AI in education, but they propose a competency-protective framework: first, establish AI-independent baseline competency; second, build critical calibration through structured teaching on AI's strengths and weaknesses; and only then, integrate AI under supervision. It's a vital call for thoughtful pedagogy as we navigate this new technological era.

Editor's Pick

If you only have time for one paper this week, make it the study by Niederberger and colleagues in *Resuscitation* on naloxone in out-of-hospital cardiac arrest [5]. Its finding that naloxone was associated with improved survival specifically in patients with a PEA rhythm is a powerful, hypothesis-generating result that could change how we manage non-shockable arrests.

Clinical Bottom Line

Here are the key takeaways from this week in Emergency Medicine.

One: In out-of-hospital cardiac arrest with a PEA rhythm, consider administering naloxone. A large retrospective study found an association with improved survival to discharge in this specific group [5].

Two: For suspected DVT, compression ultrasound performed by a trained emergency physician is highly accurate and can cut the time to diagnosis from four hours to one, supporting its routine use for improving patient flow [7].

Three: When it comes to airway management in cardiac arrest by BLS providers, current evidence does not show a survival benefit for supraglottic airways over bag-valve-mask ventilation [2].

Four: Be aware of the growing potential for wearable technology to detect pulselessness. A simulation study suggests that even modest adoption could double the survival rate for unwitnessed cardiac arrests [4].

Five: The global burden of mental health disorders has surged, with anxiety and depression leading the way. Mental disorders are now the number one cause of disability worldwide, a fact reflected in the rising volume of psychiatric emergencies in our departments [9].

That's your roundup for This Week in Emergency Medicine. The full transcript and references are available on the episode page in your AudioScholar library. This is an AI-curated summary — for clinical decisions, always consult primary sources and current guidelines. See you next week.