A 72-year-old male presents with sudden onset of severe coldness, pallor, numbness, and agonizing pain in his left lower leg. On exam, left femoral pulse is palpable, but popliteal and pedal pulses are absent. What are the classical '6 Ps' of acute arterial limb ischemia?

Answer and explanation

Correct answer: D. Pain, Pallor, Pulselessness, Paresthesia, Paralysis, and Poikilothermia

  1. Step 1: Acute limb ischemia results from sudden arterial occlusion (embolism or in situ thrombosis).
  2. Step 2: The classical clinical findings are the 6 Ps: Pain, Pallor, Pulselessness, Paresthesia (sensory loss), Paralysis (motor weakness indicating advanced threat), and Poikilothermia (inability to regulate temperature / cold limb).
  3. Step 3: Immediate heparinization and emergency revascularization are needed to prevent limb amputation.
Answer
Pain, Pallor, Pulselessness, Paresthesia, Paralysis, and Poikilothermia.
Why not the others: 'Pain, Purpura, Pruritus, Paresthesia, Pyrexia, and Polyuria' includes dermatologic and metabolic terms irrelevant to vascular occlusion; 'Pallor, Petechiae, Papules, Paresthesia, Phlebitis, and Pain' includes inflammatory skin findings; 'Pulsatility, Pressure, Petechiae, Paresthesia, Prostration, and Paralysis' lists contradictory terms such as pulsatility in an occluded vessel.

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