Common Mistakes Under Stress
Avoiding the errors that cost lives — lessons from real-world incidents
Why We Make Mistakes
Under stress, cognitive function degrades. Fine motor skills suffer. Tunnel vision sets in. Training and repetition are the antidote — but knowing the common failure points helps you avoid them.
Key Insight: Most errors aren’t from lack of knowledge. They’re from stress-induced regression to untrained behaviors or skipping steps under pressure.
Mistake #1: Forgetting the Order
The Error
Jumping straight to airway assessment because “ABC” is drilled into civilian first aid. Meanwhile, the casualty bleeds out from a femoral wound.
Why It Happens
Years of civilian first aid training emphasize ABC (Airway, Breathing, Circulation). In trauma, hemorrhage kills faster than airway obstruction — MARCH reflects this reality.
The Fix
- Mantra: “What’s killing them fastest?” Usually, it’s bleeding.
- Visual anchor: Blood on the ground = address M first
- Repetition: Run scenarios until MARCH is automatic
Mistake #2: Tourniquet Too Low
The Error
Placing the tourniquet directly over the wound or just above it, where tissue damage prevents effective compression.
Why It Happens
Instinct says “put it where the bleeding is.” But tourniquets work by compressing vessels against bone — they need healthy tissue to work.
The Fix
- Rule: HIGH and TIGHT — as proximal as possible
- Upper extremity: High on the arm, near the axilla
- Lower extremity: High on the thigh, near the groin
- If in doubt: Apply higher
Mistake #3: Tourniquet Too Loose
The Error
Applying a tourniquet but not tightening enough. Venous bleeding may stop (giving false confidence) while arterial bleeding continues.
Why It Happens
Fear of causing pain. Unfamiliarity with how tight is tight enough. Not checking for distal pulse elimination.
The Fix
- Tighten until bleeding stops completely
- Check: No distal pulse should be palpable
- Pain is expected: A properly applied TQ hurts
- Add a second TQ if needed, side-by-side, not higher
Mistake #4: Tunnel Vision on One Injury
The Error
Spending too long treating one obvious injury while missing other lethal problems. Example: Perfectly packing a wound while tension pneumothorax develops.
Why It Happens
Visible injuries grab attention. Blood is psychologically compelling. We fix what we can see.
The Fix
- Time limit: Spend no more than 60-90 seconds on any single intervention before reassessing
- Full sweep: Complete the entire MARCH assessment before returning to refine treatments
- Verbalize: Say out loud “Moving to A” to force yourself through the sequence
Mistake #5: Not Reassessing
The Error
Treating and moving on without checking if interventions worked. Tourniquets can loosen during movement. Chest seals can fail.
Why It Happens
Pressure to move fast. Assumption that “done is done.” No systematic checkpoint.
The Fix
- After every intervention: Check it worked
- After any movement: Reassess all treatments
- Set a mental timer: Check everything as situation dictates
- Buddy check: If you have help, have them verify
Mistake #6: Hesitation
The Error
Knowing what to do but freezing. Waiting for permission. Second-guessing the decision to apply a tourniquet.
Why It Happens
Fear of being wrong. Fear of causing harm. Paralysis from too many options.
The Fix
- Trust your training: If hemorrhage is massive, apply the tourniquet. Period.
- Bias toward action: A tourniquet applied unnecessarily can be removed. Blood lost cannot be replaced.
- Decision threshold: “If I’m asking whether they need a tourniquet, they probably need a tourniquet.”
Doctrine: “An imperfect intervention now beats a perfect intervention too late.”
Mistake #7: Poor Communication
The Error
Not telling anyone what you’ve done, when, or why. The next responder arrives and has no context.
Why It Happens
Focus on treatment, not documentation. No time. No system.
The Fix
- TCCC Casualty Card: Fill it out. Attach it to the casualty.
- Time everything: Especially tourniquet application
- Verbal handoff: “Tourniquet on right thigh at 0945, chest seal anterior right, two units blood lost”
Mistake #8: Ignoring Hypothermia
The Error
Treating all visible injuries but leaving the casualty exposed and wet. Hypothermia develops insidiously and worsens outcomes.
Why It Happens
It’s not dramatic. Other problems seem more urgent. The environment might feel “warm enough.”
The Fix
- Hypothermia prevention is treatment: It’s the H in MARCH for a reason
- Cover early: Even while treating other injuries
- Remove wet clothing: As soon as tactically feasible
- Ground insulation: The ground steals heat faster than air
Building Error Resistance
The antidote to stress-induced error is:
- Repetition: Practice MARCH until it’s reflexive
- Checklists: Use them, even mentally
- Verbalization: Talk yourself through steps
- Scenarios: Expose yourself to decision-making under simulated stress
- After-Action Review: Analyze what went wrong (and right) after every scenario
The next module covers Delay and Deterioration — understanding what happens physiologically when interventions are delayed, so you recognize why timing matters.