Paramedic Papers Daily — 26 October 2026

Three papers today. Paper one — a narrowed pulse pressure on scene helps flag trauma patients who are actively bleeding. Paper two — ECPR nearly doubles survival in refractory cardiac arrest, and the benefit lasts well past the usual sixty-minute mark. Paper three — an instrumented manikin neck that gives real-time feedback during immobilisation training.

Paper one — Injury. A retrospective multicentre cohort of two thousand one hundred and seventy-seven adult trauma patients, run across three level one trauma centres in Alberta, Canada. The question — can the pulse pressure taken before hospital predict active haemorrhage? Around three per cent of patients were actively bleeding, and those patients had a median prehospital pulse pressure of forty millimetres of mercury, versus fifty-three in the non-bleeders. Pulse pressure predicted haemorrhage about as well as systolic blood pressure did. Each ten millimetres of narrowing raised the odds of active haemorrhage by fifty-one per cent. A pulse pressure of forty-five or less was most useful for ruling bleeding out, thanks to a high negative predictive value. The attraction is that it's two numbers off the cuff crews already take — no new kit, no new drugs. The blood transfusion endpoint is hospital-side, and prehospital blood is still limited to a few Australian services, so the flag is the practical part here. Caveat — it's retrospective, with only sixty-eight bleeding patients, so that forty-five cut-off needs prospective validation.

Paper two — the European Heart Journal Acute Cardiovascular Care. A target trial emulation in the Korean nationwide cardiac arrest registry — fifty-eight thousand six hundred and sixty-eight patients with refractory out-of-hospital cardiac arrest, of whom nine hundred and nine received ECPR. The design matters: controls were restricted to patients still in refractory arrest at the same decision point. At the fifteen, thirty and sixty-minute landmarks, thirty-day survival with ECPR versus conventional CPR was thirty-one per cent versus sixteen, twenty-two versus seven, and eleven versus three. The benefit was biggest with early initiation, but it stayed statistically significant out to a hundred and twenty minutes — so the sixty-minute benchmark many systems apply may be overly restrictive for selected patients. ECPR is an in-hospital tool — Australian crews don't deliver it — but the transport and destination calls that get a refractory arrest to an ECMO centre belong to the crews. Caveat — this is propensity-adjusted observational data, not randomised, so selection bias about who gets ECMO is likely.

Paper three — the Proceedings of the Institution of Mechanical Engineers, Part H. A device design and bench validation study — one instrumented manikin neck prototype, built for an existing patient simulator. It's a three-dee-printed ball-and-socket neck that moves in six degrees of freedom, with springs and motion-limiting stoppers giving passive stiffness, and an array of slide potentiometers measuring head position against the torso in real time. Head-angle accuracy came in within zero point nine degrees of optoelectronic motion capture. Proof of concept only — the range of motion was limited by the build, and the authors say it needs work before it's evaluated in actual paramedic training settings. Interesting for training programs, but nothing here changes what crews do yet.

Quick recap. One — a narrowed prehospital pulse pressure helps rule out active haemorrhage in trauma, using numbers already off the cuff. Two — ECPR roughly doubled thirty-day survival in refractory cardiac arrest, with benefit persisting past the sixty-minute mark. Three — an instrumented manikin neck prototype brings real-time motion feedback to immobilisation training.

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