The hallmark of the embolic stroke is the rapidity of onset. Typically, without warning, the patient collapses to the floor, conscious, but hemiplegic. Seizures are common. Headache and vomiting are rare.
Emboli lodged in the junction of the vertebral arteries results in brain stem infarction. Entrapment at the upper end of the basilar artery produces unilateral or bilateral visual disturbance.
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