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Positive findings of paradoxical contrast embolization were found in 17 subjects by transcranial Doppler sonography but in only 8 on contrast echocardiography.These positive findings were detected more frequently in group A(77%)than in groups B,D,and E(9%,18%and 9%,respectively)(P<.05).In group C,4 of 6 patients(67%)had positive findings.There were positive findings on both phlebography and pulmonary scintigraphy only in 6 group A patients,with positive findings of paradoxical contrast embolization. Transcranial Doppler sonography is a sensitive detector of right-to-left shunts.Paradoxical cerebral embolization might be frequent in patients with stroke of unknown etiology,especially when the stroke is of sudden onset. |
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cerebral embolism cerebrovascular accident cerebrovascular accident,cryptogenic cerebrovascular accident,etiology cerebrovascular accident,work up for doppler doppler,transcranial echocardiogram echocardiogram,contrast embolism,paradoxical right-left cardiac shunt
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