Aeromedical Retrieval Training

Clinicians moving into retrieval work usually arrive with strong resuscitation skills and discover that the job is mostly something else: anticipation, preparation and logistics. The clinical care delivered in flight is often quite simple. The difficulty is that you must decide, before departure, how you will handle every problem that could plausibly occur, because in flight your options collapse.

This article covers the parts that transfer least well from hospital practice: the physiology that changes at altitude, the packaging discipline, and the questions that have to be settled on the ground.

If you want to rehearse pre-departure decisions, run a transfer case in the app.

Altitude physiology that actually changes management

A great deal is written about flight physiology and only a few elements routinely alter what you do. These are the ones worth understanding properly.

Falling partial pressure of oxygen. Cabin pressure in a pressurised aircraft is maintained at an equivalent altitude well above sea level, and helicopters frequently operate unpressurised. The consequence is a lower inspired oxygen partial pressure, which is tolerated easily by a healthy passenger and much less easily by a patient with limited reserve. A patient who is marginal on the ground can decompensate in the air, which is why the pre-departure question is never "are they stable now" but "what is their reserve".

Gas expansion. Trapped gas expands as ambient pressure falls. This matters for any air-filled space that cannot vent — which includes the pleural space, bowel, sinuses and middle ear, and also every piece of equipment with a cuff or a balloon. Cuff pressures rise in flight and need to be managed, and a small collection of air in the chest is not a small problem at altitude.

Cabin altitude is sometimes negotiable. Where the aircraft and the mission allow, a lower cabin altitude can be requested for a patient in whom the above matters. Whether that is available is an operational question for the crew, not a clinical assumption you can make.

Everything else is environmental rather than physiological. Vibration, noise, temperature, acceleration and limited light degrade your ability to assess a patient far more than they affect the patient. Auscultation is largely unavailable, palpation is unreliable, and you will be relying on monitoring and on what you established before departure.

Packaging: the discipline that defines the specialty

Packaging means preparing the patient and the equipment so that the transfer requires as little intervention as possible. It is unglamorous and it is the single largest determinant of whether a retrieval goes well.

The organising question is uncomfortable and useful: if this line, tube, drain or device fails at the halfway point, what will I do? If the honest answer is "very little", the device needs to be more secure before departure, or the problem needs to be solved on the ground.

Practically:

• Secure everything twice, and check it after every move. Each transfer between surfaces — bed to trolley, trolley to aircraft — is a moment where things get dislodged, and the moves are also when you are most distracted.
• Reduce what is running. Every additional infusion is an additional pump, an additional line and an additional failure mode in a space where you cannot reach behind anything.
• Route lines where you can see them. If a line disappears under a blanket, it does not exist for the duration of the flight.
• Do the procedure on the ground. Anything you think you might need in the air should be done before departure, where there is light, space and a second pair of hands.
• Calculate consumables against the worst-case duration, then add margin. Oxygen, battery, drugs. Weather diversions and holding patterns are routine, and running out of oxygen is a category of error with no recovery.

Questions to settle before the doors close

A short pre-departure list, said out loud with the team. It is not a substitute for your service's checklist — it is the clinical reasoning that sits alongside it.

1. Is this patient more likely to survive the transfer than to survive staying? The fundamental question, and sometimes the answer is no. A retrieval that should not have departed is a worse outcome than a difficult decision to wait.
2. What is the most likely deterioration, and what is my plan for it? Name one or two specific scenarios and state the plan aloud. Vague readiness is not a plan.
3. What will I do if I cannot manage it in flight? Divert, land, or continue. Knowing which of these is available, and how long each takes, is aviation information you must ask for rather than assume.
4. Do I have enough of everything for twice the planned duration? Oxygen and battery in particular, calculated rather than estimated.
5. Does the receiving team know what is coming? A structured referral, given before departure, including the trajectory and what you expect to need on arrival.
6. Is anyone on the team uneasy? Asked explicitly, and answered. Aviation safety culture treats an unvoiced concern as a hazard, and that applies to the clinical crew too.

Working inside an aviation team

You are a member of a crew, not a clinician with an aircraft attached. Three consequences that catch new retrieval clinicians.

Aviation decisions are not yours. Weather, fuel, duty time, load and route belong to the crew. What you contribute is the clinical consequence of each option — how long this patient can wait, what a longer route costs them — so the crew can weigh it. Stating a clinical requirement as an aviation instruction is the fastest way to become ineffective.

Sterile periods are absolute. During critical phases of flight the crew are not available and non-urgent communication does not happen. Anything you need to raise, raise before or after, and know in advance how you would signal a genuine emergency.

Speak up early and in the crew's language. Aviation culture has spent decades building the expectation that any crew member raises a concern regardless of seniority. Use it. "I need to stop the descent for two minutes if that is possible" is usable; visible discomfort is not.

Training for this without an aircraft

Most of the skill is rehearsable on the ground, and the elements that need an airframe are the smaller part.

Rehearse pre-departure decision-making. Take a case, set a departure deadline, and work through the six questions above under time pressure. Include scenarios where the correct answer is to delay or not to go, because those are the ones people find hardest and are least often practised.

Practise packaging physically. On a manikin, in a confined space, with the actual equipment. Time it. Then have someone move the trolley and check what came loose.

Practise assessment without your usual senses. Run a scenario with ear defenders on and no auscultation permitted. It reframes how much you have been relying on inputs that will not be available.

Rehearse the referral and the handover. Structured, over a poor-quality phone line, with numbers read back. This is the most transferable single skill and it costs nothing to practise.

And read your service's clinical standards and aviation procedures properly before your first mission. General principles orient you; the operating procedures are what you will be held to.