Eleven new papers today — here are the top four. Paper one — hot nights push out-of-hospital cardiac arrest risk up by about nine per cent, worst for older people and women. Paper two — a commentary says the evidence for prehospital ECPR isn't strong enough to justify building programs yet. Paper three — English case studies find paramedics delivering end-of-life care are learning on the job, without records, anticipatory medicines or anyone to ring for advice. Paper four — longer scene-to-door times cut the odds of a good outcome after stroke thrombectomy, but only in patients who were already disabled before the stroke.

Paper one — the International Journal of Biometeorology. A time-stratified case-crossover study using a nationwide Japanese database, covering more than one hundred and thirty-five thousand emergency hospitalisations for out-of-hospital cardiac arrest across eleven Japanese summers in the twenty-tens. The question: does heat at night matter, separate from the day's maximum? A hot night was defined as a minimum temperature above the region's ninety-second percentile. On those nights, cardiac arrest hospitalisations rose about nine per cent, and the risk climbed to roughly thirty per cent higher for people aged seventy-five and over, and about thirty-five per cent higher for women in northern regions — where air-conditioning is less common. Worth noting heading into an Australian summer: older people sleeping in hot bedrooms are exactly the patients crews meet on night shift. The caveat is that it counts hospitalisations only, so arrests where nobody was transported don't appear, and a nightly minimum temperature is a crude way to measure what a body actually experienced.

Paper two — Prehospital Emergency Care. This one's a commentary, not new data — a narrative review of the three big randomised trials of extracorporeal CPR for out-of-hospital cardiac arrest. The strongest positive result, the ARREST trial, had just thirty patients. The two larger trials, INCEPTION and Prague OHCA, didn't reach statistical significance. The authors' real point is structural: nearly every ECPR system needs intra-arrest transport to get the patient on the pump, and that transport itself may explain part of the reported benefit — you can't cleanly separate the two. Their message to system leaders is to pump the brakes before building a program. No Australian ambulance service runs routine ECPR for arrest, so for most crews this is context for where the evidence actually sits, not a change to practice.

Paper three — BMC Palliative Care. A qualitative case study of three English ambulance services and how their models shape paramedic end-of-life care — one hundred and one participants, seventy-five of them healthcare professionals, plus twenty-six patients and carers. Across all three services, the same gaps dominated: paramedics learned end-of-life care on the job, and access to patient records, anticipatory medicines and palliative advice was patchy. Much of the workload traced back to shortfalls in primary and community services — ambulances filling holes other parts of the system left open. Two of the services trialled fixes: advanced paramedics carrying anticipatory medicines, and an in-house specialist palliative team with dedicated palliative care ambulances. The limitation is that these three services were picked for their end-of-life specifications, so they're not typical. But the underlying gaps will sound familiar to crews here in Australia, and the models are ones local services could copy.

Paper four — BMC Emergency Medicine. A retrospective single-centre cohort from a Japanese comprehensive stroke centre — one hundred and twenty-one thrombectomy patients transported directly from the scene. Across the whole cohort, scene-to-door time barely predicted outcome. But in patients with any pre-stroke disability, longer scene-to-door time independently cut the odds of a favourable outcome at ninety days — each minute mattered, with the sweet spot around fourteen minutes. The catch: it's one centre, one hundred and twenty-one patients, retrospective. Treat it as hypothesis-generating — but scene-to-door time is exactly the interval crews control on stroke jobs, and this hints it matters most for the frailest patients.

Quick recap. One — hot nights raise cardiac arrest hospitalisation risk by about nine per cent, worst for older women. Two — the ECPR trial evidence isn't strong enough for widespread prehospital adoption yet. Three — paramedics deliver end-of-life care with learning on the job and patchy resources, across every service model studied. Four — longer scene-to-door times hurt outcomes after thrombectomy, but only in patients with pre-stroke disability.

Seven more on the dashboard today, including prehospital treatment for kratom-derivative withdrawal and clearer AED voice prompts fixing lay-user errors.

That's the roundup for Sunday the twenty-fifth of October. Papers on the dashboard. Back tomorrow.