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Lesson

Compartment Syndrome in the Field

10 min Trauma Skip to quiz

Objective: Spot limb compartment syndrome before the pulse disappears, distinguish it from crush-release hyperkalemia, and move toward a surgeon instead of reassuring them.

Why This Is Hard

The dorsalis pedis is there, so crews write “CMS intact.” Compartment syndrome is a pressure diagnosis. Pulselessness is late. Crush syndrome (release, hyperK, fluids) is a different clock — see that lesson. This one is the closed limb that is dying from the inside after tibia, forearm, crush-without-release, burn, or a cast that is too tight.

On this truck
  • The 5/6 P’s teaching: pain (especially on passive stretch) is the early one. Pallor, paresthesia, paralysis, pulselessness are late. Poikilothermia is late.
  • Remove rings, tight boots, and circumferential burns’ first-aid constriction. Loosen splints that you made too tight.
  • Do not ice a suspected closed compartment the way you ice a sprain. Destination is a hospital that can measure pressure and operate.

Street Sequence

  1. MARCH. Then the limb: look, feel tightness, passive stretch of the muscles in that compartment.
  2. Splint in position of function. Reassess after splinting — you may have created the compartment.
  3. Pain control per protocol. This pain is real. Do not withhold analgesia to “keep the exam.”
  4. If this followed a prolonged extrication / crush: also run the crush/hyperK pathway. The two can coexist.

Field Rules (Education)

  • Pulse present ≠ fine. Waiting for pulselessness is waiting for muscle death.
  • Passive stretch pain in the muscles of that compartment is the street exam that matters.
  • Not crush syndrome. Crush is reperfusion after release. Compartment can happen with the limb still trapped or hours later in a closed fracture.
  • Fasciotomy is not a porch procedure. Your job is recognition, loosening constriction, and a surgeon.
Say out loud
  • Pain out of proportion — compartment on the table
  • Pulse present does not clear it
  • Loosen the splint / boot / rings
  • Surgeon-capable destination

Field Pitfalls

  • Documenting CMS intact and staying because there is a pulse.
  • Ice-and-elevate like an ankle sprain on a rock-hard calf.
  • A circumferential splint you cannot recheck.

Practice

60-second drill

Tibia, tight calf, screams on passive dorsiflexion, DP pulse present. Three actions and the sentence you will not write. How is this different from crush release?

Related: Crush Syndrome, Pediatric Trauma in the Field.

Sources & Further Study

Named guidelines for further study. They are not clinical orders and do not replace your protocol or medical direction.

Education only. Apply learning within your protocols and medical direction. This is not clinical care guidance.

Check Your Understanding

Street decisions from this lesson only. After you check, the key is highlighted. Education practice — not a certification exam.

1. A pulse in a rock-hard, stretch-painful compartment:
2. The early street finding is:
3. Compartment syndrome vs crush syndrome:
4. Icing a suspected closed compartment like a sprain:
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