Structured casualty assessment in complex terrain
Outdoor incidents rarely happen in convenient places.
You may be dealing with poor light, cold weather, uneven ground, and a group who are looking to you for direction.
The scene is safe, your group is sorted but in these moments, structure matters.
That is where ABCDE comes in — a simple, structured approach to clinically assess, identify and treat life-threatening problems.
It is widely used in emergency medicine and trauma care because it prioritises the problems most likely to kill a casualty first.
Research shows the ABCDE approach improves recognition of life-threatening conditions and helps teams prioritise treatment effectively (Thim et al., 2012).
For outdoor leaders, it provides something just as valuable:
A clear thinking process when situations become chaotic.
A – Airway
Can the casualty maintain their airway?
Airway obstruction can kill quickly.
If the airway is blocked, nothing else matters.
Look for:
• inability to speak
• noisy breathing
• reduced consciousness
Management may include opening the airway with head tilt–chin lift, or jaw thrust if spinal injury is suspected.
If a casualty can speak clearly, their airway is open — for now.
B – Breathing
Once the airway is open, assess breathing.
Look for:
• chest movement
• breathing rate
• effort of breathing
• skin colour
Breathing problems outdoors may result from chest injury, asthma, hypothermia or severe allergic reactions.
Even mild breathing difficulty can deteriorate quickly in cold environments.
C – Circulation
Uncontrolled bleeding is a leading cause of preventable trauma death.
Modern trauma care often prioritises catastrophic haemorrhage first, sometimes written as <C>ABCDE (NICE Major Trauma Guidance).
Check for:
• severe bleeding
• pale or clammy skin
• rapid pulse
• signs of shock
Control major bleeding early using direct pressure, dressings, or tourniquets if trained.
D – Disability
This step assesses neurological function.
A quick and practical method is AVPU:
• Alert
• responds to Voice
• responds to Pain
• Unresponsive
Changes in consciousness can indicate serious problems such as head injury, hypoxia or shock.
E – Exposure and Environment
Expose injuries where necessary — but manage the environment.
Outdoor casualties lose heat quickly.
Look for hidden injuries, then prioritise:
• insulation
• shelter
• group shelters or emergency bivvies
Preventing hypothermia is often as important as treating the injury itself.
Remember: ABCDE is a loop
ABCDE is not a single assessment.
It is a continuous cycle.
After every intervention, return to the start and reassess.
Casualties change.
Conditions change.
Your assessment must keep up.
A final thought for instructors
Most instructors learn ABCDE early in their careers. With a refresh every three years.
But like any skill, it fades without practice.
A quick seasonal refresher helps keep it sharp.
Because when an incident happens in complex terrain, your group needs someone who can stay organised and make good decisions under pressure.
ABCDE helps you do exactly that.
Train once. Save for life.
Be Adventure Ready.
References
Thim T. et al. (2012) Initial assessment and treatment with the ABCDE approach.
International Journal of General Medicine.
NICE (2016) Major trauma: assessment and initial management.
StatPearls (2023) Trauma Primary Survey.
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