A 55-year-old man presents with acute onset right leg pain, pallor, paraesthesia, and paralysis. The limb is cold with absent pulses below the right femoral artery. The paralysis and fixed skin staining are present for 4 hours. According to Rutherford classification of acute limb ischaemia, what is the limb category and what is the appropriate management?
- A Category III (irreversible); primary amputation ✓
- B Category I (viable); anticoagulation and monitoring
- C Category IIa (marginally threatened); anticoagulation and urgent revascularization within 6 hours
- D Category IIb (immediately threatened); emergency revascularization within 1-2 hours
Explanation
Rutherford Category III acute limb ischaemia is defined by major tissue loss, profound neurologic deficit, and irreversible ischaemia — characterized clinically by paralysis, paresthesias, fixed skin staining (mottling that does not blanch on pressure), and a limb that has been ischaemic beyond the window for viable revascularization. In this category, revascularization carries risk of reperfusion injury (myonephropathic metabolic syndrome with hyperkalemia, myoglobinuria, and acute renal failure) that can be life-threatening. Primary amputation is the appropriate treatment. Differentiating Category III from Category IIb (still salvageable with emergency revascularization) is a critical clinical decision.
Reference: Bailey & Love's Short Practice of Surgery, 27th ed.
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Written and medically reviewed by the StethoPrep medical team.