Avalanche rescue training focuses, correctly, on the companion rescue sequence: beacon search, probe, dig. Most training ends at extrication — the moment the buried person is pulled from the snow. But extrication is not the end of the medical emergency. A person who has been buried under compacted avalanche debris is a trauma patient, potentially a hypothermia patient, potentially a cardiac arrest patient, and often all three simultaneously. The first aid that follows extrication is as important as the rescue that preceded it.

This guide covers the medical management of an avalanche casualty from the moment of extrication to the arrival of emergency services — the period that rescue training does not fully address.

What Avalanche Burial Does to the Body

Understanding the physiology of burial explains the assessment priorities. An avalanche burial produces four potential injury categories, each with a different time course and urgency:

Asphyxia (suffocation)

The primary cause of avalanche death in extended burials. Avalanche debris compacts to concrete-like density within minutes of settling — the chest wall cannot expand against this pressure, and CO₂ from exhaled breath rapidly displaces oxygen in any air pocket. Survival in burial is determined primarily by whether an air pocket formed around the face at the moment of arrest, and how quickly that air pocket depletes. The survival curve for avalanche burial is steep: 90% survival at under 15 minutes of burial (most deaths from trauma at this stage), dropping to approximately 50% at 30 minutes, under 30% at 45 minutes. Speed is everything.

Trauma

The avalanche flow itself — the initial impact, tumbling in debris, contact with trees, rocks and terrain features — produces trauma before burial occurs. High-speed avalanche trauma can cause fractures, internal injury, spinal injury and head injury that exist independently of the burial state. A person who comes out of an avalanche conscious and oriented may have serious injuries that the extrication adrenaline is masking.

Hypothermia

Burial in snow produces rapid heat loss — snow is cold and the buried person cannot move to generate heat. Core temperature begins to fall immediately after burial. Burial over 30 minutes produces significant hypothermia in most patients. Hypothermia that causes cardiac arrest in an avalanche victim is potentially reversible with active rewarming — the “not dead until warm and dead” principle applies with particular force to avalanche burial.

Crush syndrome

Extended burial under compacted avalanche debris causes prolonged muscle compression, which releases myoglobin (muscle protein) into the bloodstream on liberation — a process called rhabdomyolysis. Significant crush injury can cause acute kidney failure in the 24–48 hours following rescue and requires hospital management. The field implication: any person buried for more than 30 minutes under heavy debris requires hospital assessment regardless of apparent recovery at the scene.

Extrication: The Medical Priorities

Create an air pocket before full extrication

Before fully removing the debris from around the casualty, clear the face and create space around the head and chest for breathing. A person in the late stages of asphyxia needs air within seconds — this takes priority over orderly, spinal-protection-conscious extrication. Once the airway is accessible and the chest is free to expand, reassess before continuing full extrication.

Assume spinal injury — but prioritise airway

The avalanche mechanism involves tumbling, impact and deceleration — all spinal injury mechanisms. Minimise unnecessary neck movement during extrication. However: an airway that cannot be opened takes priority over a spinal precaution. Use jaw thrust rather than head-tilt-chin-lift if spinal injury is suspected, but open the airway regardless.

Immediate Post-Extrication Assessment

Is the person breathing?

Check for normal breathing immediately after airway clearance. If not breathing normally: begin CPR immediately. Avalanche cardiac arrest is potentially reversible — even after extended burial if hypothermia (rather than trauma) is the primary mechanism. Continue CPR without interruption until emergency services take over or until the person is confirmed dead after rewarming in a hospital setting.

The specific exception to CPR: do not begin CPR if the chest is completely frozen and incompressible, or if there are obvious unsurvivable injuries (decapitation, open head wound with brain matter visible). In all other cases of absent breathing in an avalanche casualty, begin CPR.

Core temperature assessment

Estimate core temperature from: burial time, degree of consciousness on extrication, presence of shivering. The Swiss staging system for hypothermia provides guidance on CPR decision in avalanche burial:

Insulation and Evacuation

Preventing further heat loss

Once the immediate airway and circulation assessment is complete, focus entirely on preventing further heat loss. An avalanche casualty loses heat through: wet clothing against cold air, cold ground contact, and respiratory losses. The priority sequence:

• Remove wet clothing if dry replacements are available; if not, add insulation layers over wet clothing rather than removing them
• Ground insulation: place the casualty on a sleeping mat, packed backpack or skis — never directly on snow
• Wrap in sleeping bag, bivvy bag or all available insulation; cover the head; protect from wind
• Chemical heat packs to the axilla, groin and neck if available — these are the areas with major blood vessels closest to the surface
• Do not give warm drinks to an unconscious or semi-conscious patient — aspiration risk; warm drinks are appropriate for a conscious, oriented patient with an intact swallow

Evacuation decision

Every avalanche burial casualty requires hospital assessment regardless of apparent recovery. The reasons:

• Internal injuries from trauma may not be immediately apparent at the scene
• Crush syndrome from extended burial produces delayed kidney injury requiring fluid management
• Cardiac instability from hypothermia can produce arrhythmia hours after extrication
• Head injury sequelae (intracranial haemorrhage) can develop over hours with initial apparent lucidity

Call emergency services as early in the rescue as possible — ideally one person calls while others begin digging. The helicopter dispatch takes time, and landing zone preparation, patient preparation and weather windows all benefit from an early call. Give GPS coordinates, number of buried persons, apparent injury severity and burial duration.

The Rescuers: Managing Your Own State

Companion avalanche rescue is one of the highest-stress events a mountain user will experience. The physiological effects of adrenaline — tunnel vision, time distortion, fine motor degradation, difficulty sequencing complex tasks — all impair exactly the skills the rescue requires. Two practical countermeasures:

• Practise the beacon search until it is automatic. Adrenaline reduces a 60-second rehearsed beacon search to a 90-second stress-degraded one. It reduces an unrehearsed search to something much longer. Regular practice is the only countermeasure.
• Assign tasks explicitly. “You search with the beacon. You probe. I dig. You call 112 and watch for secondary release.” Explicit task assignment prevents the paralysis of four people all doing part of one thing and completing nothing.