A 68-year-old woman with a history of permanent atrial fibrillation and hypertension presents to the emergency department with a 3-hour history of sudden-onset, severe right leg pain. She admits to running out of her oral anticoagulant medication a week ago. On physical examination, the right foot and distal calf are pale and cool to the touch. Sensation to light touch is intact, and she can move all her toes without difficulty. Capillary refill is delayed. Palpation reveals a normal femoral pulse, but popliteal and pedal pulses are absent.
Arrange the following steps in the most appropriate sequential order for the evidence-based management of this patient's condition.
- 1Assess pedal vessels using bedside continuous-wave Doppler ultrasonography
- 2Administer an intravenous bolus and continuous infusion of unfractionated heparin
- 3Obtain computed tomography angiography (CTA) of the affected lower extremity
- 4Proceed with definitive revascularization via catheter-directed thrombolysis or surgical embolectomy
Cevap
The correct sequence is: (1) Doppler ultrasonography, (2) Intravenous heparin, (3) Computed tomography angiography, (4) Definitive revascularization.
Acute limb ischemia requires rapid evaluation and intervention. The patient presents with a viable limb (Rutherford Category I) as she has intact sensory and motor function. The immediate first step after physical examination is to objectively assess blood flow using bedside continuous-wave Doppler. Once ischemia is confirmed, systemic anticoagulation with intravenous unfractionated heparin is initiated immediately to halt thrombus propagation. Because the limb is not immediately threatened (no neurological deficit), it is safe and appropriate to obtain a CTA to map the vascular anatomy. Finally, definitive revascularization is performed based on the detailed imaging findings.
Adım Adım Çözüm
Anahtar Kavram
Sequential management of acute limb ischemia based on Rutherford classification
Alternatif Yöntem
In centers without rapid access to CTA, conventional digital subtraction angiography (DSA) in the operating room can be performed simultaneously with the revascularization intervention.
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