Examkin

Question

Difficulty: Very hardSurgical and Procedural Interventions

A 68-year-old man presents to the emergency department complaining of sudden, excruciating pain in his left leg that began 4 hours ago. He has a history of paroxysmal atrial fibrillation and recently stopped taking his prescribed rivaroxaban due to financial constraints. On physical examination, the left lower extremity is notably pale and cool to the touch from the mid-thigh distally. The left femoral pulse is palpable, but the popliteal, dorsalis pedis, and posterior tibial pulses are absent. Handheld continuous-wave Doppler reveals no arterial signals in the left foot, but venous signals remain audible. Neurologic examination of the left lower extremity demonstrates profound loss of sensation extending up to the mid-calf and a new-onset inability to dorsiflex the foot. Intravenous heparin and adequate analgesia are administered immediately. Which of the following is the most appropriate next step in the management of this patient?

  1. Emergent open surgical embolectomyAnswer
  2. B
    Catheter-directed intra-arterial thrombolysis
  3. C
    Computed tomography angiography of the lower extremities
  4. D
    Primary above-knee amputation
  5. E
    Prophylactic lower extremity four-compartment fasciotomy

Answer

Emergent open surgical embolectomy is the correct intervention for a patient with Rutherford IIb acute limb ischemia.
The correct answer accurately identifies the need for immediate surgical intervention. The patient presents with Rutherford category IIb acute limb ischemia, characterized by rest pain, sensory loss beyond the toes, mild-to-moderate muscle weakness (inability to dorsiflex), absent arterial Doppler signals, and audible venous signals. Because the limb is immediately threatened and will suffer irreversible damage if not reperfused within a few hours, the definitive treatment is emergent open surgical embolectomy. This rapidly restores blood flow, which is critical given the presence of acute neurologic deficits.

Step-by-Step Solution

1
Analyze the patient's symptoms and physical exam findings.
The patient has acute onset leg pain, pallor, absent pulses, absent arterial Doppler signals, audible venous signals, sensory loss extending to the calf, and motor weakness (inability to dorsiflex).
These findings are classic for acute limb ischemia, likely embolic given the history of untreated atrial fibrillation.
2
Classify the severity of the acute limb ischemia using the Rutherford classification system.
The presence of motor weakness and sensory loss beyond the toes, combined with audible venous signals, classifies this as a Rutherford IIb (immediately threatened) limb.
Classification dictates the timeline and type of procedural intervention required.
3
Determine the appropriate procedural intervention based on the classification.
Rutherford IIb requires emergent surgical revascularization (embolectomy).
Limb viability is measured in hours. Time-consuming diagnostics (CTA) or slow-acting therapies (catheter-directed thrombolysis) must be bypassed in favor of immediate surgical reperfusion.

Key Concept

Patients presenting with Rutherford category IIb acute limb ischemia (immediately threatened, presenting with motor deficits or sensory loss beyond the toes) require emergent open surgical revascularization without delay for advanced imaging.
Rate this question

Topics

Surgical and Procedural Interventions

More questions from this topic