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C - Circulatory icon

MARCH Module 04 of 05

C — Circulation & Shock

The bleeding may be controlled — but has the casualty already lost enough blood to die? C teaches perfusion: recognizing shock before it becomes irreversible. It is the module where "the bleeding stopped" and "the casualty is stable" get separated.

Aligned with CoTCCC / C-TECC guidance Medical SME Veteran-Led Kits Assembled in the USA

The Physiology

Why C Comes Fourth

Shock is not a blood-pressure number — it is inadequate perfusion. The body compensates brilliantly until it can't, and the collapse is fast.

3

Sides Of The Triad

Hypothermia, acidosis, coagulopathy — the Lethal Triad. Blood loss feeds all three; each worsens the others. C is where you recognize the spiral early.

~30%

Loss Before Collapse

A casualty can lose roughly a third of their blood volume while walking and talking, until compensation fails. Normal behavior early does not rule out deep shock later.

2

Field Checks Anyone Can Use

Mental status and radial pulse quality tell you more in the field than any number. Confused or weak-pulsed means shocked until proven otherwise.

Compensation Ends Fast

The compensated casualty deteriorates on a cliff, not a slope. A casualty who was talking and is now confused has told you something — believe them.

Recognize — Simple Field Indicators Of Shock

  • Mental status — confusion, agitation, or declining responsiveness.
  • Peripheral (radial) pulse quality — weak, thready, or hard to find.
  • Skin signs — pale, cool, clammy — interpreted cautiously.
  • Trends in vital signs where equipment exists.
  • Mechanism and injury pattern — suspect occult hemorrhage from high-energy events even when external bleeding looks minor.

C-TECC active-bystander guidance identifies altered mental status plus weak or absent peripheral pulses as important field indicators of traumatic shock when obvious head injury is absent.

Clinical diagram: perfusion prioritization during hemorrhagic shock
Perfusion first: blood belongs circulating, not on the pavement.

Act — Stop The Spiral

  • Re-control any bleeding that recurs — that is M again. The loop is not optional.
  • Keep the casualty warm — hypothermia worsens coagulopathy (see Module H). Prevention starts now, not after shivering begins.
  • Expedite transport — definitive care for shock lives in an operating room, not on the scene.
  • Minimize unnecessary movement and exertion — a compensating casualty can be tipped over the cliff by walking.
DOC'S FIELD NOTE

Don't stare at a blood-pressure number while the patient in front of you is obviously deteriorating. Trends and physiology matter.

Check — Watch The Trend, Not The Moment

  • Reassess mental status and pulses at every loop cycle.
  • A casualty who was talking and is now confused has told you something — believe them.
  • Improvement after intervention must be re-confirmed — compensation can mask ongoing loss.

Don't — The Failure Patterns

  • Assuming bleeding control equals resuscitation — the lost volume does not replace itself.
  • Missing occult hemorrhage — abdominal and pelvic bleeding hides from a blood sweep.
  • Failing to recognize early shock because the casualty "still looks okay."
  • Treating a single reassuring vital sign as a stable casualty — trends, not snapshots.

What This Looks Like At Your Level

Switch roles to compare scope

Civilian / Prepared Citizen

Recognize deterioration, call or upgrade the emergency response early, keep the casualty warm — and never assume that because external bleeding stopped, the danger has passed.

Recognize deterioration · Upgrade response · Keep casualty warm · Reassess

Law Enforcement / First Responder

Rapid evacuation, reassessment, and communicating findings to EMS — your report of "what changed and when" is clinical information the receiving crew needs.

Same + rapid evacuation · Reassessment · EMS handoff communication

Medic / EMS / Clinician

Hemorrhagic shock management: access (IV/IO), blood-product strategy, TXA and calcium where applicable, pelvic stabilization, damage-control resuscitation, TBI-specific considerations, and destination triage.

Hemorrhagic shock · IV/IO · Blood products · TXA · Calcium · Pelvic stabilization · Damage-control resuscitation · Destination triage

Module Self-Check

Test Your C Knowledge

1. External bleeding stopped, tourniquet holding. Is the casualty stable?
Answer: Not necessarily. C asks whether they have already lost enough blood to die. Watch mental status, pulse quality, and skin signs for shock — bleeding controlled is not casualty stabilized.
2. A casualty who was talking calmly is now confused. What does that mean?
Answer: Believe them — decompensating shock until proven otherwise (or hypoxia, or a head problem — re-run the loop). Altered mental status with weak peripheral pulses is a field indicator of shock per C-TECC guidance.
3. Why does C tell you to keep the casualty warm when the problem is blood loss?
Answer: The Lethal Triad: hypothermia worsens coagulopathy, and a cold casualty clots poorly — so every intervention you already did works worse. Warm is not comfort care; it is hemostasis support.
4. A high-energy car crash, no external bleeding visible. Can the casualty still be in shock?
Answer: Yes — occult hemorrhage. Abdominal, pelvic, and thoracic bleeding hide from a blood sweep. Mechanism matters: high-energy means suspect internal loss.
5. What is the single most important transport decision in shock?
Answer: Speed to the right destination. Definitive care for hemorrhagic shock is surgical — field interventions buy time; they do not reverse the spiral.

Equipment

Build Your C Capability

Pressure dressings, packing, and hemostatic tools, live from the store's circulation catalog.

Continue The Sequence

Next MARCH Modules

Clinical Reference

TCCC content reviewed against CoTCCC Guidelines — 1 May 2026 · Civilian / LE content reviewed against current C-TECC guidance

Guidelines evolve. Agency protocols and scope of practice control. Educational alignment — not a certification.

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