Syncope: a videometric analysis of 56 episodes of transient cerebral hypoxia.

Abstract:

:To investigate the clinical features of transient cerebral hypoxia, syncope was induced in 56 of 59 healthy volunteers through a sequence of hyperventilation, orthostasis, and Valsalva maneuver. All events were monitored on video by two cameras. Complete syncope with falling and loss of consciousness was observed in 42 subjects, lasting 12.1 +/- 4.4 seconds. Myoclonic activity occurred in 38 of these 42 episodes (90%). The predominant movement pattern consisted of multifocal arrhythmic jerks both in proximal and distal muscles. Superposition of generalized myoclonus was common. Additional movements such as head turns, oral automatisms, and righting movements occurred in 79%. Eyes remained open throughout syncope in most subjects and initial upward deviation was common. Sixty percent reported visual and auditory hallucinations. Thirteen subjects had incomplete syncope with falls but partially preserved consciousness. These episodes were shorter and usually not accompanied by myoclonus and hallucinations. Transient amnesia and unresponsiveness without falling occurred in 1 subject.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Lempert T,Bauer M,Schmidt D

doi

10.1002/ana.410360217

subject

Has Abstract

pub_date

1994-08-01 00:00:00

pages

233-7

issue

2

eissn

0364-5134

issn

1531-8249

journal_volume

36

pub_type

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