Document Detail

Electroencephalography in syncope.
MedLine Citation:
PMID:  9244159     Owner:  NLM     Status:  MEDLINE    
Electroencephalographic (EEG) findings in syncope are reviewed. There are four major categories of syncope: neurally mediated (neurocardiogenic), neurologic, decreased cardiac output, and orthostatic hypotension. However, regardless of cause, whether the syncope is due to a vasovagal effect, a cardiac arrhythmia, an epileptic seizure, or hypotension, EEG findings are similar and reflect cerebral hypoperfusion. Initially there may be a slowing of background rhythms. This is followed by high amplitude delta activity, maximal anteriorly. If the hypoperfusion persists there is subsequent flattening of the EEG. The EEG returns to normal in the reverse sequence. In cases with severe and prolonged ischemia, convulsive syncope may occur at the time of the EEG flattening. Although not an epileptic phenomena, clinically this is often mistaken for epilepsy. Conversely, epileptic disorders, such as the ictal bradycardia syndrome, may occasionally mimic syncope. Therefore, in patients in whom EEGs are performed for the evaluation of an episode of loss of consciousness, simultaneous ECG should be used.
R P Brenner
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society     Volume:  14     ISSN:  0736-0258     ISO Abbreviation:  J Clin Neurophysiol     Publication Date:  1997 May 
Date Detail:
Created Date:  1997-09-25     Completed Date:  1997-09-25     Revised Date:  2005-11-16    
Medline Journal Info:
Nlm Unique ID:  8506708     Medline TA:  J Clin Neurophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  197-209     Citation Subset:  IM    
University of Pittsburgh, Pennsylvania, USA.
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MeSH Terms
Autonomic Nervous System Diseases / complications
Cardiac Output, Low / complications
Middle Aged
Peripheral Nervous System Diseases / complications
Seizures / diagnosis,  etiology
Syncope / diagnosis*,  physiopathology
Syncope, Vasovagal / diagnosis,  etiology

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