Field Skills · Lesson 5 of 6
Common Field Mistakes
Most preventable deaths in the field come from a handful of repeated errors. Understanding why these mistakes happen — and how to avoid them — is as important as learning the protocols themselves.
Based on Real Combat Trauma Analysis
These are real patterns documented from combat trauma analysis. They're not hypothetical — they represent the difference between casualties who survived and those who didn't.
1Tourniquet Too Loose
The Mistake
Applied Without Achieving Hemostasis
Tourniquet applied but casualty continues to bleed. Often driven by fear of "damaging" the limb, or from rushing without twisting tight enough. The tourniquet looks applied — but it isn't doing its job.
The Fix
Tighten Until Bleeding Stops — Then One More Click
Pain is expected and acceptable. Verify success: no pulse distal to tourniquet, no visible bleeding. If in doubt, tighten more. A properly applied tourniquet should cause discomfort — that's the target.
2Tourniquet Time Not Noted
The Mistake
No Time Written on Band or Casualty Card
Receiving medics have no idea when the tourniquet went on. This directly limits the conversion window — 2 hours for uncomplicated cases, 4–6 hours maximum. Without a time, providers must assume the worst.
The Fix
Mark Time Immediately — On Band, Card, and in ZMIST
Write the time on the tourniquet band with a marker immediately after applying. Record it on the casualty card. State it explicitly in every ZMIST handoff. Time is a life-critical data point.
3Airway Neglected in Unconscious Patient
The Mistake
Provider Moves On After Hemorrhage Control
Hemorrhage is controlled and the provider "moves on" without assessing the airway. An unconscious patient's tongue silently occludes the airway — there's no obvious choking sound to alert you. Minutes pass. Irreversible brain damage follows.
The Fix
Assess Airway Immediately After Hemorrhage Control
Insert an NPA if GCS is less than 13 or patient is non-responsive to verbal stimuli. If no spinal concern, position in the recovery position to maintain a passive airway. This step takes 30 seconds — skip it and you may lose the patient.
4Skipping MARCH to Focus on Obvious Injury
The Mistake
Distracted by Dramatic Presentation
A visible, dramatic injury — open fracture, large laceration, gross deformity — draws full attention while a missed tension pneumothorax or unaddressed arterial bleed quietly kills the casualty. Visual anchoring is a known cognitive trap under stress.
The Fix
Complete MARCH Top to Bottom — Every Time
The protocol exists precisely because our threat prioritization under stress is unreliable. Follow MARCH in sequence, regardless of what looks most severe. Do not skip ahead. Do not abbreviate. The dramatic injury can wait — tension pneumo cannot.
5Not Calling MEDEVAC Early Enough
The Mistake
Waiting Until the Patient Is "Definitely Bad Enough"
Providers delay the 9-Line call while managing the casualty, wanting to have complete information or certainty. MEDEVAC assets have significant spin-up and transit time — every minute of delay equals a minute of late arrival at the receiving facility.
The Fix
Call 9-Line as Soon as Hemorrhage Control Is Achieved
You can update the report while the bird is in the air. An incomplete 9-Line transmitted early is far better than a perfect 9-Line transmitted late. If the casualty is urgent, the clock is already running — start the request immediately.
6Anxiety-Driven Over-Resuscitation
The Mistake
Large-Volume IV Fluids to "Raise" Blood Pressure
Pushing large volumes of IV fluids in penetrating trauma actually increases mortality. Aggressive resuscitation dislodges forming clots and causes dilutional coagulopathy — accelerating the very hemorrhage you're trying to stop.
The Fix
Permissive Hypotension — Maintain Radial Pulse Only
Target: radial pulse present (approximately systolic 80–90 mmHg). Use 250 mL boluses and reassess after each. Exception: TBI patients require systolic ≥90 mmHg to maintain cerebral perfusion pressure. Know which protocol applies before you flush a bag.
7Forgetting Hypothermia Prevention
The Mistake
Patient Left on Cold Ground in Wet Clothing
After completing clinical interventions, the patient is left on the ground in wet clothes. Hypothermia accelerates the lethal triad — hypothermia, acidosis, coagulopathy — even in warm ambient temperatures. Cold ground conducts heat away rapidly.
The Fix
Remove Wet Clothing, Insulate from Ground, Wrap and Cover
Remove wet clothing. Insulate from ground contact. Wrap in an emergency blanket. Cover the head. This takes 90 seconds and dramatically improves outcome by interrupting the lethal triad before it fully develops. Never skip this step.
8Chest Seal Applied Incorrectly — or Not at All
The Mistake
Unvented Seal Used — or Wound Identified and Ignored
Using an unvented (occlusive) chest seal on a sucking chest wound converts an open pneumothorax to a tension pneumothorax — a rapid fatal deterioration. Alternatively, a wound is identified but no seal is applied because the provider is "not sure."
The Fix
Vented Seals Only — Improvised If Necessary
Use only vented (flutter-valve) chest seals. If you see a sucking chest wound, seal it immediately — uncertainty is not a reason to wait. If no commercial seal is available, improvise with a glove, plastic wrap, or packaging. Imperfect is always better than nothing.
9Failure to Reassess
The Mistake
Treat Once — Then Stop Monitoring
Initial interventions are completed and the provider moves to the next casualty or task, never returning to assess the first. TCCC patients deteriorate rapidly — tourniquets migrate, tension pneumothorax develops after initial chest assessment, mental status drops silently.
The Fix
Reassess Every 5–10 Minutes — Repeat Mini-MARCH
During Tactical Field Care, cycle back to treated casualties every 5–10 minutes. Run a rapid mini-MARCH: Is bleeding controlled? Is the airway patent? Is breathing adequate? Is mental status improving or declining? Deterioration caught early is often reversible.
10Poor Handoff Communication
The Mistake
Rushed, Incomplete Verbal Handoff
The verbal handoff is rushed or improvised. The receiving team doesn't know what treatments were given, when the tourniquet went on, what medications were administered, or what the patient's status was at the scene. Information gaps cause critical delays at the next level of care.
The Fix
Use ZMIST — Every Time, Even if Rushed
At minimum: mechanism, tourniquet time (if applicable), vitals, and medications given. A 20-second ZMIST delivered clearly is worth more than 2 minutes of incomplete rambling. Practice it until it's automatic — ideally before you're ever in the field.
Combat Trauma Data: OIF/OEF Analysis
Analysis of US combat deaths in OIF/OEF found that 87% of pre-hospital deaths were potentially survivable. The leading causes: hemorrhage (90% of those cases), airway compromise, and tension pneumothorax — all directly addressable with TCCC protocols.
🕐 What Kills Fastest
Understanding time-to-death for the major threat categories reinforces why MARCH is sequenced the way it is.
Massive Hemorrhage
Death in 3–5 min
Arterial bleed from an extremity can exsanguinate in under 5 minutes. This is why M comes first in MARCH — there is no time to do anything else.
Tension Pneumothorax
Death in 15–30 min
Builds progressively as air accumulates and compresses the mediastinum. Needle decompression is fast and immediately life-saving — but only if recognized.
Airway Obstruction
Irreversible damage in 4–6 min
Brain tissue begins permanent hypoxic damage within 4–6 minutes of airway obstruction. An unconscious patient cannot protect their own airway — you must do it for them.
The Best Way to Avoid These Mistakes
Simulation training is the single most effective way to prevent these mistakes. The MedReady app offers scenario-based training where you practice MARCH under time pressure — exactly the context in which these errors occur. Try the MedReady simulator →