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Zorluk: OrtaSurgical and Procedural Interventions

A 71-year-old man arrives at the emergency department complaining of sudden, agonizing pain in his left leg that started 3 hours ago. He has a medical history of essential hypertension and paroxysmal atrial fibrillation, but he stopped taking his prescribed apixaban two months ago. Vital signs are temperature 37.1°C (98.8°F), blood pressure 148/88 mm Hg, heart rate 118/min and irregularly irregular, and respiratory rate 18/min. On physical examination, the left lower extremity is pale, mottled, and cold to the touch from the mid-thigh distally. The patient reports severe numbness over the dorsal aspect of his left foot and demonstrates mild weakness when asked to actively dorsiflex his toes. Handheld Doppler ultrasound evaluation of the left lower extremity reveals absent arterial signals in the dorsalis pedis and posterior tibial arteries, but venous signals remain audible.

Which of the following are the most appropriate immediate next steps in the management of this patient? (Select exactly 2 options)

  1. Administration of an intravenous bolus of unfractionated heparinCevap
  2. Emergent consultation for open surgical embolectomyCevap
  3. C
    Computed tomography angiography of the lower extremities
  4. D
    Initiation of catheter-directed intra-arterial thrombolysis
  5. E
    Measurement of ankle-brachial index using a sphygmomanometer

Cevap

The most appropriate immediate next steps are the administration of an intravenous bolus of unfractionated heparin and an emergent consultation for open surgical embolectomy.
This patient presents with acute limb ischemia, likely secondary to a thromboembolus originating from his heart due to medication-noncompliant atrial fibrillation. The severity of acute limb ischemia is staged using the Rutherford classification. This patient exhibits sensory loss (numbness over the dorsum of the foot), mild motor weakness (weak toe dorsiflexion), absent arterial Doppler signals, and preserved venous Doppler signals. This specific constellation of physical findings categorizes his leg as an immediately threatened limb (Rutherford category IIb). The management of a category IIb limb requires a two-pronged immediate approach: halting thrombus progression and urgently restoring blood flow. An intravenous bolus of unfractionated heparin provides immediate systemic anticoagulation to prevent the clot from extending into the distal microcirculation. Concurrently, emergent open surgical revascularization (such as a transfemoral embolectomy) is required because it is the fastest method to restore arterial inflow and salvage the limb before irreversible neuromuscular necrosis occurs.

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1
Evaluate the severity of the acute limb ischemia based on the physical examination and Doppler findings.
The patient has sensory loss, mild motor weakness, absent arterial Doppler signals, and audible venous signals, which classifies his condition as a Rutherford category IIb (immediately threatened) limb.
Categorizing the ischemia determines whether the patient has time for imaging/medical therapy or requires emergent surgical intervention.
2
Determine the necessary initial medical stabilization.
Systemic anticoagulation with intravenous unfractionated heparin should be administered immediately.
Heparin prevents further propagation of the existing thrombus and protects the distal collateral microcirculation while awaiting surgery.
3
Select the appropriate definitive interventional strategy.
Emergent open surgical revascularization (embolectomy) must be consulted for immediately.
A category IIb limb has a very narrow window before irreversible neuromuscular necrosis occurs; open surgery restores perfusion much faster than pharmacological thrombolysis.

Anahtar Kavram

Management of acute limb ischemia is dictated by the Rutherford classification. An immediately threatened limb (category IIb) characterized by resting pain, motor weakness, sensory loss, and inaudible arterial Doppler signals requires immediate systemic anticoagulation with heparin and emergent open surgical revascularization.
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Surgical and Procedural Interventions

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