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Zorluk: ZorSurgical and Procedural Interventions

An 8282-year-old woman is brought to the emergency department due to unrelenting right lower extremity pain. She was found by her neighbor on the floor of her apartment. The patient states the pain began abruptly 1616 hours ago. Her medical history includes type 22 diabetes mellitus, hypertension, and paroxysmal atrial fibrillation. She is not taking oral anticoagulants. Vital signs are temperature 37.2∘C37.2^\circ\text{C} (99.0∘F99.0^\circ\text{F}), blood pressure 158/92 mm Hg158/92\text{ mm Hg}, pulse 115/min115/\text{min} and irregularly irregular, and respirations 18/min18/\text{min}. On physical examination, the right lower extremity is cyanotic, mottled, and cold to the touch from the mid-thigh down. Capillary refill is absent. The patient has complete loss of sensation to pinprick and light touch below the knee. She is unable to move her toes or ankle, and the calf muscles are rigid and tender to palpation. Bedside Doppler ultrasonography reveals absent arterial and venous signals in the right foot. Which of the following is the most appropriate next step in the management of this patient's right lower extremity?

  1. Primary lower extremity amputationCevap
  2. B
    Emergent open surgical embolectomy
  3. C
    Catheter-directed intra-arterial thrombolysis
  4. D
    Computed tomography angiography of the lower extremities
  5. E
    Systemic anticoagulation with continuous intravenous heparin

Cevap

Primary lower extremity amputation
The correct answer recommends primary lower extremity amputation. This patient presents with acute limb ischemia that has progressed to irreversible tissue damage (Rutherford Category III). Clinical signs of irreversible ischemia include profound sensory loss, complete paralysis, muscle rigidity (rigor), and absent arterial and venous Doppler signals. In the setting of irreversible ischemia, attempts at revascularization (such as embolectomy or thrombolysis) are strictly contraindicated. Restoring blood flow to necrotic muscle tissue washes massive amounts of potassium, lactic acid, and myoglobin into the systemic circulation. This reperfusion syndrome frequently causes fatal cardiac arrhythmias, severe metabolic acidosis, and acute kidney injury. Therefore, the only appropriate surgical intervention is primary amputation to remove the necrotic tissue and prevent systemic toxicity.

Adım Adım Çözüm

1
Evaluate the clinical presentation and physical exam findings of the acutely ischemic limb.
The patient has an acutely ischemic leg with complete anesthesia, paralysis, muscle rigidity, and absent arterial and venous Doppler signals.
Accurate categorization of acute limb ischemia determines the appropriate procedural intervention.
2
Categorize the severity of the ischemia using standard clinical criteria (Rutherford classification).
The findings (profound sensory/motor loss, rigor, absent venous signals) categorize this as Rutherford Category III (irreversible ischemia).
Category III indicates major tissue loss and permanent damage have already occurred.
3
Determine the appropriate surgical intervention based on the irreversibility of the ischemia.
Primary amputation is selected. Revascularization (embolectomy, thrombolysis) is strictly contraindicated.
Reperfusing a necrotic limb causes massive release of potassium, myoglobin, and lactic acid, leading to fatal reperfusion syndrome.

Anahtar Kavram

Surgical management of Rutherford Category III (irreversible) acute limb ischemia requires primary amputation to prevent life-threatening reperfusion syndrome.
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Surgical and Procedural Interventions

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