Written by Nick Zelt
Spoon Feed
Recent decades have done little to improve the sobering statistics behind out-of-hospital-cardiac arrest (OHCA) with asystole, leaving us to focus on prevention over treatment.
At least there’s a chance?
Rates of asystolic OHCA are on the rise, making up at much as 60% of arrests in developed countries, while rates of shockable OHCA are declining. This is crucial because rates of favorable neurologic survival are the worst when asystole is the initial rhythm, and rates of survival have not improved with time. Some even advocate against resuscitation in the case of asystole at all.
These authors performed a systematic review and meta-analysis, including 82 studies with the primary outcome of the pooled rate of survival to 30-days or hospital discharge. Survival rates ranged between 0% and 23%, with an overall survival rate of 1.5%. The only modifiable factor associated with the survival was EMS skill level. Bystander-witnesses arrest, bystander CPR, arrest location, EMS response time and transport times were not associated with survival. The pooled rate of pre-hospital ROSC was 16%, and favorable neurological survival was 0.6%. A meta-analysis comprised of older studies reported a 0.2% survival rate, suggesting a persistently poor survival rate without significant improvement in recent decades.
How does this change my practice?
Given profoundly low survival and favourable neurological outcome rates, the best strategies likely lie in arrest prevention and early response to prevent degradation of shockable rhythms into asystole. I personally find these numbers humbling and will let them provide reassurance that poor outcomes are the norm and not a personal failing in cases of asystole.
Source
Incidence and outcomes of out-of-hospital cardiac arrest from initial asystole: a systematic review and meta-analysis. Resuscitation. 2025 Jul;212:110629. doi: 10.1016/j.resuscitation.2025.110629. Epub 2025 May 3. PMID: 40324517
