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EM TopicsED systems, safety and professional

EM · ED systems, safety and professional

Retrieval and inter-hospital transfer

Also known as Inter-hospital transfer · Secondary retrieval · Aeromedical retrieval · Patient transport · Drip-and-ship · Time-critical transfer · Specialist retrieval

Retrieval and inter-hospital transfer is the structured process of moving a patient between facilities (or from scene to facility) to deliver a level or type of care the referring site cannot provide. The decision rests on three transfer types — time-critical (STEMI door-to-balloon, stroke thrombolysis and thrombectomy windows), specialist (trauma, burns, neurosurgery, paediatric, neonatal, ECMO), and repatriation — each with its own urgency, mode, and team. Pre-transfer packaging converts an unsafe move into a safe one: secure the airway (RSI before transfer for the patient with GCS 8 or less), secure the lines (two large-bore IVs, an arterial line, central access for the unstable), secure the monitors (ECG, SpO2, NIBP, capnography), secure the ventilation (mechanical ventilator with set parameters), and secure the sedation (opioid–benzodiazepine analgesia-sedation, titrated to ventilator tolerance). Mode — road, fixed-wing, or rotary — is chosen on distance, physiology, weather, and the time-versus-stability trade-off. Team composition (physician-staffed versus paramedic/nurse) is matched to the predicted deterioration risk. The governing differential is the decision itself: stay-and-play (resuscitate to stability first) versus scoop-and-run (load and go, manage on the move), with the time-critical bypass (direct to PCI, to thrombolysis, to a trauma centre) as the third path. Transport-related deterioration — hypoxia, hypotension, hypothermia, gas expansion at altitude, line and tube loss, undetected desaturation — is the central risk, and the discipline is to minimise it by preparation, not improvisation. ACEM-primary, globally tagged.

medium16 referencesUpdated 26 July 202618 min readVerification in progress

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Red flags

  • Time-critical transfer is not a packaging decision — it is a routing decision; a STEMI bound for primary PCI, an ischaemic stroke within the thrombectomy window, and major trauma all bypass the nearest facility for the definitive centre, and the clock starts at first medical contact, not at departure
  • An undrained pneumothorax in a pressurised aircraft is a tension pneumothorax waiting to happen — gas volume expands by up to about a third at cabin altitude, and every intubated patient must have a chest drain before flight if any pneumothorax is present or suspected
  • An unsecured endotracheal tube cuff pressure in flight will either leak (under-pressurised, worsened by altitude gas expansion) or cause tracheal ischaemia (over-pressurised) — cuff pressure is set and re-checked before take-off and at altitude
  • A patient transferred without an arterial line and capnography is a patient whose deterioration will be detected late — the noise, vibration, and restricted access of a moving vehicle strip away the clinical signs relied on at the bedside
  • Scoop-and-run without packaging kills — the patient who is loaded and moved with an unsecured airway, an undrained pneumothorax, or uncontrolled catastrophic haemorrhage arrives at the receiving centre worse than they left
On this page

Related topics

  • Patient disposition and safety-netting in the emergency department
  • Clinical handover and the ISBAR framework in the emergency department
  • Trauma team leadership
  • Team-based care and crisis resource management in the emergency department
  • Acute coronary syndromes (STEMI, NSTEMI and unstable angina)
  • Acute ischaemic stroke
Study tools

Your progress

Saved on this device.

Practise this topic8 MCQs with explanations

Target exams

ACEMFRCEMABEMFRCPCCCFPEMEBEEM

Red flags

  • Time-critical transfer is not a packaging decision — it is a routing decision; a STEMI bound for primary PCI, an ischaemic stroke within the thrombectomy window, and major trauma all bypass the nearest facility for the definitive centre, and the clock starts at first medical contact, not at departure
  • An undrained pneumothorax in a pressurised aircraft is a tension pneumothorax waiting to happen — gas volume expands by up to about a third at cabin altitude, and every intubated patient must have a chest drain before flight if any pneumothorax is present or suspected
  • An unsecured endotracheal tube cuff pressure in flight will either leak (under-pressurised, worsened by altitude gas expansion) or cause tracheal ischaemia (over-pressurised) — cuff pressure is set and re-checked before take-off and at altitude
  • A patient transferred without an arterial line and capnography is a patient whose deterioration will be detected late — the noise, vibration, and restricted access of a moving vehicle strip away the clinical signs relied on at the bedside
  • Scoop-and-run without packaging kills — the patient who is loaded and moved with an unsecured airway, an undrained pneumothorax, or uncontrolled catastrophic haemorrhage arrives at the receiving centre worse than they left
The one-line answer

Retrieval is three senior judgements in a fixed order — whether to move (the decision, weighed against treating locally, awaiting a visiting team, or not moving at all), how to move (mode and team), and how to package the patient so the journey does no harm — and over all three hangs the time-critical window: STEMI first medical contact-to-balloon 90 minutes direct and 120 minutes by transfer, stroke thrombolysis within 4.5 hours, thrombectomy in the early window and to 24 hours for the selected.[10][11][6][16]

Meet the patient

A 34-year-old is thrown from a car at speed and lands in a regional ED with a GCS of 7 and a left pupil fixed and dilated. The CT shows a large left extradural haematoma with midline shift. The neurosurgical centre is 320 km away and a physician-staffed fixed-wing team has been tasked. The two questions that decide whether he reaches theatre with a salvageable brain are the two that decide every retrieval: is the airway, the lines, and any pneumothorax secured before the wheels move — and does anyone remember that the gas in his endotracheal tube cuff, and any occult pneumothorax, will expand by up to about a third at cabin altitude?[2][7]

Retrieval looks like a logistical problem and is examined as a clinical one. It is the structured movement of a patient from a site that cannot deliver definitive care to one that can — primary (scene to first hospital) or secondary (inter-hospital). The Fellowship exam is about secondary retrieval, because that is decision emergency medicine consultant owns, and it sorts into three urgencies: time-critical (minutes matter), specialist (hours matter), and repatriation (days matter).[2]

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References16ShowHide
  1. [1]Droogh JM, Smit M, Hut J, et al. Inter-hospital transport of critically ill patients; expect surprises Crit Care, 2012.PMID 22326110
  2. [2]Wilcox SR, Wax RS, Meyer MT, et al. Interfacility Transport of Critically Ill Patients Crit Care Med, 2022.PMID 36106970
  3. [3]Severino F, Gallani MC, Mercier É, et al. Interhospital transfers from the emergency department: a mixed-methods study on their characteristics and contextual factors influencing their quality CJEM, 2026.PMID 41811642
  4. [4]Laverty C, Tien H, Beckett A, et al. Primary aeromedical retrieval crew composition: Do different teams impact clinical outcomes? A descriptive systematic review CJEM, 2020.PMID 33084563
  5. [5]Zahran A, Milhem F, Bdair M, et al. Interhospital transfer versus direct admission for percutaneous coronary intervention in patients with acute ST-segment elevation myocardial infarction: a systematic review and meta-analysis Clin Res Cardiol, 2025.PMID 41396303
  6. [6]Palaiodimou L, Papageorgiou NM, Bakola E, Theodorou A, Romoli M, Sarraj A. Drip and ship in patients with acute ischemic stroke: a narrative review Ther Adv Neurol Disord, 2025.PMID 41063760
  7. [7]Delorenzo A, Shepherd M, Andrew E, et al. Endotracheal Tube Intracuff Pressure Changes in Patients Transported by a Helicopter Emergency Medical Service: A Prospective Observational Study Air Med J, 2021.PMID 34172227
  8. [8]Brun PM, Bessereau J, Chenaitia H, et al. Stay and play eFAST or scoop and run eFAST? That is the question! Am J Emerg Med, 2014.PMID 24332906
  9. [9]Street M, Considine J Analysis of the impact of limitation of medical treatment orders during unplanned transfers from sub-acute care to Emergency Departments Australas Emerg Nurs J, 2016.PMID 26601595
  10. [10]Kmail H, Jaradat M, Abbas A, et al. First medical contact-to-balloon time and in-hospital outcomes of primary percutaneous coronary intervention for ST-elevation myocardial infarction in Jenin, Palestine: a retrospective cohort study (2023-2024). BMC Cardiovasc Disord, 2026.PMID 42185763
  11. [11]Menees DS, Peterson ED, Wang Y, et al. Door-to-balloon time and mortality among patients undergoing primary PCI. N Engl J Med, 2013.PMID 24004117
  12. [12]Engstrom K, Brown CS, Mattson AE, et al. Pharmacotherapy optimization for rapid sequence intubation in the emergency department. Am J Emerg Med, 2023.PMID 37196592
  13. [13]Ter Avest E, Ragavan D, Griggs J, et al. Haemodynamic effects of a prehospital emergency anaesthesia protocol consisting of fentanyl, ketamine and rocuronium in patients with trauma: a retrospective analysis of data from a Helicopter Emergency Medical Service. BMJ Open, 2021.PMID 34930748
  14. [14]Baez AA, Qasim Z, Wilcox S, et al. Prehospital Mechanical Ventilation: An NAEMSP Position Statement and Resource Document. Prehosp Emerg Care, 2022.PMID 35001824
  15. [15]Sakhuja M, Ward C, Madrigal V, et al. The Emergency Medical Treatment and Active Labor Act: Clinical Practice and Ethical Considerations. Pediatr Emerg Care, 2026.PMID 42661262
  16. [16]Jadhav AP, Desai SM, Jovin TG. Indications for Mechanical Thrombectomy for Acute Ischemic Stroke: Current Guidelines and Beyond. Neurology, 2021.PMID 34785611

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Related topics

  • Patient disposition and safety-netting in the emergency department
  • Clinical handover and the ISBAR framework in the emergency department
  • Trauma team leadership
  • Team-based care and crisis resource management in the emergency department
  • Acute coronary syndromes (STEMI, NSTEMI and unstable angina)
  • Acute ischaemic stroke