Extremity Vascular Trauma, Mangled Limb & Compartment Syndrome
Comprehensive resuscitation and limb salvage protocols: Hard vs. Soft signs of extremity arterial injury, Ankle-Brachial Index (ABI) screening, Mangled Extremity Severity Score (MESS), traumatic amputations and replantation handling, and compartment syndrome measurement (Delta P < 30 mmHg).
Resuscitation Quick Actions • First 2 Minutes
Hard Signs of Arterial Injury (MANDATORY IMMEDIATE OR)
1. Pulsatile external bleeding; 2. Expanding or pulsatile hematoma; 3. Palpable thrill or audible bruit; 4. Absent distal pulses; 5. Cold, pale, pulseless, paralyzed extremity.
Soft Signs of Arterial Injury (MANDATORY CTA Runoff)
Diminished pulses, non-expanding hematoma, history of moderate blood loss at scene, peripheral nerve deficit, proximity of wound to major vascular bundle.
Ankle-Brachial Index (ABI) Screening
ABI = Systolic ankle pressure/Highest systolic brachial pressure. ABI < 0.90 is 95-100% sensitive for major arterial injury; requires urgent CTA runoff.
Mangled Extremity Severity Score (MESS)
Evaluates 4 criteria: Skeletal/soft-tissue injury, Limb ischemia, Shock, and Patient age. Score >= 7 predicts high likelihood of amputation (100% specificity for primary amputation).
Amputated Part Replantation Protocol
Wrap amputated part in sterile saline-moistened gauze, seal in waterproof plastic bag, and place bag on an ice-water slurry (0-4°C). NEVER submerge directly in water or place directly on ice (causes frostbite/tissue death). Maximum ischemia time: Warm < 6 hours, Cold < 12-24 hours.
Compartment Syndrome
6 Ps (Pain out of proportion, Paresthesias, Pallor, Poikilothermia, Paralysis, Pulselessness). Emergent surgical fasciotomy indicated if Delta Pressure (Diastolic BP - Compartment Pressure) <= 30 mmHg.
Hard vs. Soft Signs of Arterial Injury
Hard signs (pulsatile bleeding, expanding hematoma, absent pulses, ischemia, thrill/bruit) require immediate OR; soft signs require CTA runoff.
Bottom-Line Clinical Pearl
Any 'Hard Sign' of arterial injury (pulsatile bleeding, expanding hematoma, absent distal pulse, cold/pale extremity, thrill/bruit) demands IMMEDIATE surgical exploration in the OR; do not delay for CTA. Traumatic compartment syndrome is a clinical diagnosis confirmed by a Delta Pressure < 30 mmHg (Diastolic BP minus Compartment Pressure); do NOT wait for pulselessness (a late sign of irreversible necrosis).
EMERGENCY PROTOCOL: Hard Signs = Immediate Operating Room
Do not send an unstable patient or a patient with Hard Signs of arterial trauma to the CT scanner! Transport directly to the operating suite with a tourniquet in place if needed for exsanguinating limb hemorrhage. CT angiography is reserved exclusively for hemodynamically stable patients with Soft Signs or abnormal ABI (<0.90).
| Category | Injury Criteria | Points Awarded |
|---|---|---|
| Skeletal/Soft Tissue Injury | Low energy (clean stab, simple closed fracture)\nMedium energy (open fracture, dislocation, moderate crush)\nHigh energy (close-range shotgun, high-velocity rifle, severe crush)\nVery high energy (above plus gross contamination, soft tissue avulsion) | 1 point\n2 points\n3 points\n4 points |
| Limb Ischemia | Pulse reduced or absent but perfusion normal\nPulseless; paresthesias, diminished capillary refill\nCool, paralyzed, insensate, totally ischemic limb\nDouble points if ischemia duration exceeds 6 hours | 1 point\n2 points\n3 points\n(x2 if >6 hours) |
| Shock | Systolic BP consistently > 90 mmHg in field and ED\nHypotensive transiently in field, responds to fluids\nPersistent hypotension despite aggressive fluid/blood resuscitation | 0 points\n1 point\n2 points |
| Age | Age < 30 years\nAge 30 to 50 years\nAge > 50 years | 0 points\n1 point\n2 points |
Compartment syndrome results from increased tissue pressure within an enclosed fascial space, exceeding capillary perfusion pressure and leading to tissue ischemia and irreversible myonecrosis within 6 to 8 hours.
1. Diagnostic Thresholds: - Absolute pressure: Compartment pressure > 30 mmHg. - Delta Pressure (Preferred): $\Delta P = \text{Diastolic BP} - \text{Compartment Pressure}$. If $\Delta P \le 30\text{ mmHg}$, emergent decompressive fasciotomy is indicated. (In hypotensive shock, lower absolute pressures cause ischemia!). 2. Stryker Needle Setup: Calibrate monitor to 0 mmHg. Insert needle at 45° angle into compartment. Slowly inject 0.3 mL saline to establish fluid column; read digital pressure. Measure all 4 compartments of the lower leg (Anterior [most common], Lateral, Superficial Posterior, Deep Posterior).
- Waiting for pulselessness to diagnose compartment syndrome: Pulselessness and paralysis are end-stage signs of established necrosis; pain with passive stretch and paresthesias are the earliest indicators.
- Freezing an amputated part: Placing an amputated digit directly on dry ice or submerging it in ice water destroys cellular architecture and makes microscopic replantation impossible.
- Removing a tourniquet in the ED: Never remove an EMS tourniquet applied for active life-threatening hemorrhage until complete surgical team and blood products are mobilized in the resuscitation bay or OR.
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