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Difficulty: MediumSurgical and Procedural Interventions

A 68-year-old woman is brought to the emergency department reporting sudden, severe pain in her left leg that began 4 hours ago. She has a history of rheumatic mitral stenosis and atrial fibrillation, but she has not taken her prescribed warfarin for the past two weeks. Her temperature is 37.1°C (98.8°F), blood pressure is 142/86 mmHg, and pulse is 110/min and irregularly irregular. Physical examination of the left lower extremity reveals absent popliteal and pedal pulses using a handheld Doppler ultrasound. The left leg is cold, pale, and exhibits livedo reticularis extending up to the mid-thigh. The patient has profound loss of light touch sensation over the foot and is unable to actively dorsiflex her toes. Venous Doppler signals in the left foot are audible. Which of the following is the most appropriate next step in management?

  1. Intravenous heparin and emergent open surgical embolectomyAnswer
  2. B
    Computed tomography angiography of the lower extremities
  3. C
    Catheter-directed intra-arterial thrombolytic therapy
  4. D
    Intravenous heparin and close inpatient observation
  5. E
    Emergent primary above-knee amputation

Answer

Intravenous heparin and emergent open surgical embolectomy
This patient presents with classic signs of acute limb ischemia (ALI) due to an arterial embolus, likely originating from the left atrium secondary to untreated atrial fibrillation. The severity of ALI is clinically staged using the Rutherford classification to guide management. This patient has profound sensory loss and muscle weakness (inability to dorsiflex), which classifies her condition as a Rutherford category IIb (immediately threatened) limb. Her limb is not yet irreversible (category III), as evidenced by the short duration (4 hours), lack of rigor mortis, and presence of audible venous Doppler signals. The standard of care for an immediately threatened limb is immediate systemic anticoagulation with intravenous heparin to prevent clot propagation, followed by emergent surgical revascularization (such as open surgical embolectomy or bypass) to rapidly restore perfusion and salvage the limb.

Step-by-Step Solution

1
Diagnose the clinical syndrome
Acute limb ischemia (ALI) secondary to a thromboembolic event.
Sudden onset of pain, pallor, pulselessness, paresthesias, and paralysis in a patient with atrial fibrillation strongly suggests an arterial embolus.
2
Stratify the severity of ischemia
Rutherford category IIb (immediately threatened limb).
The presence of rest pain, profound sensory loss, and early motor deficits (inability to dorsiflex) indicate impending irreversible tissue loss if not rapidly treated. Audible venous signals confirm it is not yet irreversible (Class III).
3
Determine the appropriate procedural intervention based on severity
Immediate surgical revascularization (open embolectomy) alongside systemic anticoagulation.
For an immediately threatened limb, time is tissue. Slower methods like catheter-directed thrombolysis or delays for advanced imaging will result in irreversible muscle necrosis.

Key Concept

Surgical management of immediately threatened acute limb ischemia
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Topics

Surgical and Procedural Interventions

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