Examkin

Soru

Zorluk: OrtaSurgical and Procedural Interventions

A 74-year-old man arrives at the emergency department reporting the sudden onset of severe, unremitting pain in his right leg that began 2 hours ago. His past medical history includes hypertension, hyperlipidemia, and paroxysmal atrial fibrillation. He discontinued his prescribed oral anticoagulant three weeks ago due to financial constraints. Vital signs include a temperature of 37.0°C (98.6°F), heart rate of 112/min with an irregularly irregular rhythm, and blood pressure of 145/85 mm Hg. Physical examination reveals that the right lower extremity is pale and cold from the mid-thigh down. A right femoral pulse is palpable, but the popliteal, dorsalis pedis, and posterior tibial pulses are absent on both palpation and continuous-wave Doppler ultrasound. The patient is unable to dorsiflex his right foot and reports profound numbness over the dorsum of the foot. The left lower extremity examination is unremarkable. Which of the following is the most appropriate next step in management?

  1. Intravenous heparin administration and emergent open embolectomyCevap
  2. B
    Computed tomography angiography of the lower extremities
  3. C
    Catheter-directed intra-arterial thrombolysis
  4. D
    Measurement of the ankle-brachial index
  5. E
    Initiation of an oral factor Xa inhibitor and admission to the medical ward

Cevap

The most appropriate next step in management is intravenous heparin administration and emergent open embolectomy.
The patient has acute limb ischemia due to an arterial embolus, highly likely originating from the heart due to his unmedicated atrial fibrillation. The clinical presentation encompasses the classic '6 Ps': pain, pallor, pulselessness, poikilothermia, paresthesia, and paralysis. The presence of sensory loss (numbness) and motor deficit (inability to dorsiflex the foot) defines this as an immediately threatened limb (Rutherford category IIb). The standard of care for a threatened limb with neurologic deficits is immediate systemic anticoagulation (typically with an intravenous heparin bolus and continuous infusion) to halt thrombus propagation, paired with emergent surgical revascularization (such as open embolectomy). Any delay in mechanically restoring blood flow exponentially increases the risk of irreversible tissue necrosis and subsequent amputation.

Adım Adım Çözüm

1
Analyze the patient's clinical presentation and history.
The patient has atrial fibrillation (off anticoagulation) and presents with the '6 Ps' of acute limb ischemia: pain, pallor, pulselessness, poikilothermia (cold), paresthesia (numbness), and paralysis (inability to dorsiflex).
Identifying the etiology (arterial embolus) and severity of the ischemia is critical for selecting the right intervention.
2
Categorize the severity of the acute limb ischemia using the Rutherford classification.
The presence of sensory loss (numbness) and motor deficit (inability to dorsiflex) categorizes this as a threatened limb (Rutherford category IIb).
Rutherford category dictates the urgency and type of intervention. Category IIb implies that without immediate revascularization, irreversible tissue damage will occur.
3
Determine the most appropriate management based on the ischemia category.
Immediate systemic anticoagulation with intravenous heparin is initiated, followed by prompt transfer to the operating room for surgical revascularization (embolectomy).
Heparin prevents propagation of the existing thrombus. Surgical embolectomy rapidly mechanically restores blood flow, which is mandatory because the limb cannot tolerate the time required for alternative therapies like thrombolysis.

Anahtar Kavram

Patients with acute limb ischemia presenting with neurologic deficits (sensory loss or motor weakness) have an immediately threatened limb and require emergent surgical revascularization (e.g., embolectomy) alongside systemic anticoagulation.
Tahmini Süre:1m 15s
Bu soruyu puanla

Konular

Surgical and Procedural Interventions

Bu konudan daha fazla soru