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Zorluk: KolayCardiothoracic and Vascular Surgery

A 73-year-old female patient arrives at the emergency department reporting a sudden onset of severe, unrelenting pain in her left leg that began two hours ago. She has a medical history of nonvalvular atrial fibrillation. She takes a beta-blocker for rate control but admits to stopping her oral anticoagulant medication three weeks ago. On physical examination, her left lower extremity is pale and cold from the knee down. She reports reduced sensation over the dorsum of her left foot and has difficulty moving her toes. Bilateral femoral pulses are palpable and bounding. Doppler ultrasound confirms the complete absence of popliteal and dorsalis pedis pulses in the left leg. The right lower extremity has normal palpable pulses and is warm to the touch. Vital signs show an irregular heart rate of 112/min and a blood pressure of 138/86 mmHg. Which of the following is the most appropriate initial intervention for this patient's current condition?

  1. Systemic anticoagulation with intravenous heparinCevap
  2. B
    Computed tomography angiography of the lower extremities
  3. C
    Measurement of the ankle-brachial index
  4. D
    Prophylactic four-compartment fasciotomy
  5. E
    Initiation of a supervised exercise program and oral cilostazol

Cevap

Systemic anticoagulation with intravenous heparin is the most appropriate initial step for acute limb ischemia.
The correct action is to initiate systemic anticoagulation with intravenous heparin. This patient presents with classic signs of acute limb ischemia (ALI), characterized by the acute onset of the '5 Ps': pain, pallor, pulselessness, paresthesias, and paralysis. Her history of noncompliance with oral anticoagulants in the setting of atrial fibrillation strongly points to a cardioembolic source. When ALI is suspected, particularly when the limb is threatened (evidenced by sensory and motor deficits), the most critical initial step is the immediate administration of systemic heparin. This halts the propagation of the thrombus, prevents recurrent embolization, and preserves the microcirculation while the patient is prepared for emergent definitive revascularization, such as surgical embolectomy or catheter-directed thrombolysis.

Adım Adım Çözüm

1
Identify the primary clinical syndrome from the patient's presentation.
The patient has pain, pallor, pulselessness, paresthesias, and paralysis in a single limb with a history of atrial fibrillation off anticoagulation.
Recognizing these classic signs establishes the diagnosis of acute limb ischemia due to an arterial embolus.
2
Determine the severity of the ischemia.
The presence of sensory loss and motor deficit classifies this as a threatened limb.
The severity dictates the urgency of intervention; a threatened limb requires emergent revascularization to prevent tissue necrosis.
3
Select the immediate initial medical management prior to definitive surgical or endovascular therapy.
Systemic anticoagulation with intravenous heparin must be administered immediately.
Heparin prevents further propagation of the thrombus and preserves collateral circulation while preparations for definitive revascularization are made.

Anahtar Kavram

The initial management of acute limb ischemia involves immediate systemic anticoagulation with heparin to prevent thrombus propagation, followed by prompt revascularization.
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Cardiothoracic and Vascular Surgery

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