Three papers today, all cardiac arrest. Paper one — prehospital extracorporeal CPR doubled survival in young adults with refractory arrest, in a Dutch helicopter study. Paper two — a huge community and EMS programme in the United States didn't move survival at all. Paper three — registry data links prehospital intubation with better return of spontaneous circulation, but patient selection probably explains it.

Paper one — the New England Journal of Medicine. A nationwide cohort from the Netherlands, two hundred and thirty-one adults aged fifty or younger with refractory out-of-hospital cardiac arrest. Helicopter crews equipped to start extracorporeal CPR on scene were compared with conventional helicopter crews. Forty percent of the extracorporeal group survived to hospital discharge, against twenty percent with conventional care. At six months, thirty-six percent had a favourable neurological outcome, versus thirteen percent. That's a big signal — doubling survival in refractory arrest is rare. But it's not randomised, so patients attended by the extracorporeal helicopters may have differed systematically, and that group logged thirty-two adverse events against eleven. This is a physician-staffed helicopter model, well beyond Australian road practice — so treat it as where the evidence is heading, not what crews do tomorrow.

Paper two — also the New England Journal of Medicine, and a much bigger bet. A cluster-randomised trial in North Carolina — more than twenty-two thousand arrests across fifty-five county clusters. The intervention bundled four things — training emergency call takers to recognise arrest faster and give better CPR instructions over the phone, community CPR training, and more defibrillator use before crews arrive. Result — nine percent survived with a good neurological outcome in the intervention counties, nine point four percent with usual care. No difference. A null result from a trial this size matters. It doesn't say early CPR and defibrillation don't work — it says this whole-of-community implementation strategy, layered on systems already doing the basics, didn't add measurable survival. The caveat — four components bundled together, so it can't show whether one piece underperformed.

Paper three — BMC Emergency Medicine. A retrospective registry cohort from China — six thousand one hundred and sixty-two adult non-traumatic arrests. Patients who got a tube before hospital had return of spontaneous circulation twenty-one percent of the time, against under four percent with a basic airway — and the association held up in propensity matching. Before anyone reads that as tubes saving arrests — airway choice was made by on-scene physicians, so the sicker-or-different-patients problem is baked right in. And in shockable rhythms, the unadjusted link wasn't significant at all. Intubation sits with intensive care paramedics in most Australian services, so this lands as hypothesis-generating, not practice-changing.

Quick recap. One — Dutch prehospital extracorporeal CPR doubled survival to forty percent in young refractory arrests, with nearly triple the adverse events. Two — a twenty-two-thousand-patient community and EMS programme changed nothing. Three — registry data ties prehospital intubation to more return of spontaneous circulation, but selection confounds it.

That's the roundup for Tuesday the tenth of November. Papers on the dashboard. Back tomorrow.