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Difficulty: MediumCardiothoracic and Vascular Surgery

A 68-year-old woman with a history of atrial fibrillation presents to the emergency department with a 3-hour history of sudden, severe right leg pain. On physical examination, her right lower extremity is pale and cold. Femoral pulses are palpable bilaterally, but right popliteal and pedal pulses are absent. Bedside Doppler evaluation reveals absent arterial signals but audible venous signals in the right foot. Motor function is intact, and there is mild sensory loss in the toes. Arrange the following management steps in the most appropriate chronological sequence for this patient.

  1. 1Initiation of systemic anticoagulation with intravenous unfractionated heparin
  2. 2Computed tomography angiography (CTA) of the lower extremities
  3. 3Definitive revascularization procedure (e.g., surgical embolectomy)
  4. 4Vigilant monitoring and potential four-compartment fasciotomy

Answer

The correct sequence for managing this patient's acute limb ischemia is: 1) Initiation of systemic anticoagulation with intravenous unfractionated heparin, 2) Computed tomography angiography (CTA) of the lower extremities, 3) Definitive revascularization procedure, and 4) Vigilant monitoring and potential four-compartment fasciotomy for reperfusion injury.
The standard sequence of care for a Rutherford Class IIa acute limb ischemia involves immediate systemic anticoagulation to halt thrombus progression, followed by CTA to map the vascular anatomy, followed by urgent revascularization. Postoperatively, patients must be monitored for compartment syndrome due to reperfusion injury.

Step-by-Step Solution

1
Diagnose the condition and assess limb viability.
The patient presents with classic signs of acute limb ischemia (ALI). Intact motor function and mild sensory loss with audible venous Doppler signals categorize the limb as Rutherford Class IIa (marginally threatened).
Accurate clinical categorization determines the urgency of intervention and whether preoperative imaging is safe to perform.
2
Determine the immediate initial medical intervention.
Systemic anticoagulation with intravenous unfractionated heparin should be started immediately.
Heparin prevents further propagation of the thrombus and preserves the microcirculation while further workup and intervention are planned.
3
Decide on the imaging strategy.
Obtain a CTA of the lower extremities.
Because the limb is not immediately threatened with irreversible damage (as in Rutherford IIb or III), there is time to safely obtain advanced imaging to delineate the anatomy and differentiate an embolus from in situ thrombosis.
4
Determine the definitive treatment and anticipate postoperative complications.
Proceed with revascularization, followed by monitoring for compartment syndrome.
Surgical or catheter-directed revascularization restores perfusion. Restoring flow to an ischemic limb poses a high risk for reperfusion injury and significant tissue edema, necessitating close monitoring and potential fasciotomy.

Key Concept

Management algorithm for Acute Limb Ischemia (ALI)
Estimated Time:1m 30s
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Topics

Cardiothoracic and Vascular Surgery

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