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Middle cerebral artery signals were identified in at least one cerebral hemisphere in 41 of the 45 patients.Emboli signals were present in 29 of these 41 cases(71%).These signals were bilateral in 22,within the affected (symptomatic)cerebral hemisphere only in 5,and contralateral only in 2 cases.No emboli signals were detected in any of 8 patient with lacunar stroke.Emboli signals are common in patients with acute stroke,with the notable exception of lacunar stroke.This is consistent with the small vessel etiology for the latter group and provides support for the relevance of Doppler emboli. |
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