A 72-year-old woman with atrial fibrillation not on anticoagulation presents with acute left-sided hemiparesis and facial droop. Vital signs show BP 158/92 mmHg, HR 98 and irregularly irregular, RR 16, temperature 37.2°C, and SpO2 98% on room air. MRI demonstrates acute infarction in the right middle cerebral artery territory. No hemorrhage is noted on imaging. Which of the following is the most likely mechanism of stroke in this patient?
- A)Atherosclerotic disease of the right internal carotid artery
- B)Vasospasm from subarachnoid hemorrhage
- C)Hypercoagulable state from malignancy
- D)Small vessel disease with lacunar infarction
- E)Cardioembolism from atrial thrombusGABARITO
Explicação
Atrial fibrillation creates blood stasis in the left atrial appendage, promoting thrombus formation. These emboli commonly lodge in the MCA territory, causing acute territorial infarctions. This is the most common cardioembolic source, accounting for 45-50% of... Ver explicação completa e trilha adaptativa →