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Zorluk: OrtaCardiovascular System

A 74-year-old woman is brought to the emergency department due to the sudden onset of severe, unremitting pain in her right leg that began 3 hours ago. She states the pain started abruptly while she was sitting in a chair. Her medical history includes hypertension, hyperlipidemia, and atrial fibrillation. Her medications include lisinopril and metoprolol; however, she admits that she has not taken her apixaban for the past two weeks due to financial constraints. Her vital signs include a blood pressure of 142/88 mmHg, a pulse of 115/min and irregularly irregular, and a respiratory rate of 18/min. On physical examination, the right lower extremity is pale and cold to the touch from the mid-calf distally. The right dorsalis pedis and posterior tibial pulses are absent to palpation and cannot be detected by hand-held Doppler. Sensation is decreased over the dorsum of the right foot, and she has mild weakness during dorsiflexion of the toes. Which of the following is the most appropriate initial step in the management of this patient?

  1. A
    Measurement of the ankle-brachial index
  2. B
    Computed tomography angiography of the lower extremities
  3. C
    Administration of oral aspirin and clopidogrel
  4. Administration of intravenous heparinCevap
  5. E
    Performance of a right lower extremity fasciotomy

Cevap

Administration of intravenous heparin
The correct response is the administration of intravenous heparin. This patient's acute presentation of pain, pallor, poikilothermia, pulselessness, paresthesia, and paresis (weakness) represents the classic '6 Ps' of acute limb ischemia (ALI). Her history of atrial fibrillation combined with medication nonadherence strongly points to a cardioembolic etiology. When ALI is clinically suspected, the immediate priority is to administer systemic anticoagulation with an intravenous heparin infusion. Heparin does not lyse the existing embolus, but it is crucial for preventing further propagation of the clot and protecting the distal microcirculation. This pharmacological step must be taken prior to obtaining confirmatory imaging (like CT angiography) or proceeding with definitive revascularization (such as surgical embolectomy or catheter-directed thrombolysis).

Adım Adım Çözüm

1
Identify the clinical syndrome based on the physical presentation.
The patient has pain, pallor, coldness (poikilothermia), pulselessness, paresthesia, and paralysis (weakness) in her right leg.
These are the classic '6 Ps' of acute limb ischemia, which is a vascular emergency.
2
Determine the most likely etiology.
The patient has a history of atrial fibrillation and recent cessation of anticoagulation (apixaban).
This highly suggests a cardioembolic source for the acute arterial occlusion.
3
Select the most appropriate initial management step.
Intravenous heparin infusion should be administered immediately.
Systemic anticoagulation prevents further thrombus propagation and protects the collateral circulation while preparing the patient for definitive imaging or revascularization.

Anahtar Kavram

In patients with acute limb ischemia, immediate systemic anticoagulation with intravenous heparin is the critical first step in management, and it should precede imaging or surgical intervention.
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