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자료유형
학술저널
저자정보
저널정보
대한임상신경생리학회 Annals of Clinical Neurophysiology Annals of Clinical Neurophysiology 제1권 제1호
발행연도
1999.1
수록면
64 - 69 (6page)

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Background : Syncope was defined as transient loss of consciousness and postural tone. The mechanisms of changes in cerebral hemodynamics during syncope have not been fully evaluated. Transcranial Doppler Ultrasonography can continuously monitor the changes in cerebral hemodynamics during head-up tilt (HUT). TCD could reveal the different patterns of changes in cerebral hemodynamics during syncope. Syncope without hypotension or bradycardia could be detected by TCD. We investigated the changes in cerebral blood flow velocity during HUT using TCD in 33 patients with a history of recurrent syncope or presyncope of unknown origin. Methods & Results : The positive responses were defined as presyncope or syncope with hypotension, bradycardia, or both. During HUT without isoproterenol infusion, there were a 86?3% drop in DV and a 41?4% drop in SV in 5 patients with positive reponses, and mean changes in those were less than 10% in patients with negative reponses ( p=.00, p=.00). During HUT with isoproterenol infusion, TCD showed a 80?8% drop in diastolic velocity in 14 patients with positive reponses, and a 47?0% drop in that in patients with negative reponses (p=.00), however the change in systolic velocity did not differ. TCD showed three patterns during positive responses; loss of all flow, loss of end diastolic flow, and a decrease in diastolic velocity. Loss of consciousness occurred in the patients with loss of all flow or end-diastolic flow during positive reponses. Conclusions : TCD shows different patterns of changes in cerebral hemodynamics during HUT. TCD can be used to investigate the pathophysiology of neurocardiogenic syncope

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