Document Detail

Assessment of autonomic function at rest and during tilt testing in patients with vasovagal syncope.
MedLine Citation:
PMID:  9327703     Owner:  NLM     Status:  MEDLINE    
This study evaluated autonomic nervous system function in 30 patients with syncope and a positive tilt test result, 20 with a negative test result, and 20 healthy controls. Indexes of heart rate variability were measured during the intervals immediately before and after tilt, while all subjects were asymptomatic, and over a 24-hour period. There were no significant differences among the groups in any of the indexes of heart rate variability over the 24-hour period. In patients with a positive tilt result, tilting caused a decrease in low-frequency (LF) and high-frequency (HF) bands, although the LF/HF ratio did not significantly change. In patients with a negative tilt result there was a decrease in the HF band but no other significant changes. In the controls there was an increase in the LF band and LF/HF ratio and a decrease in the HF band. Our findings showed that patients with vasovagal syncope have no chronic differences from normal subjects in autonomic nervous system activity, but that these patients respond differently to the orthostatic stimulus.
G E Kochiadakis; A T Rombola; E M Kanoupakis; E N Simantirakis; G I Chlouverakis; P E Vardas
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American heart journal     Volume:  134     ISSN:  0002-8703     ISO Abbreviation:  Am. Heart J.     Publication Date:  1997 Sep 
Date Detail:
Created Date:  1997-10-30     Completed Date:  1997-10-30     Revised Date:  2006-02-27    
Medline Journal Info:
Nlm Unique ID:  0370465     Medline TA:  Am Heart J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  459-66     Citation Subset:  AIM; IM    
Cardiology Department, University Hospital of Heraklion, Crete, Greece.
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MeSH Terms
Autonomic Nervous System / physiopathology*
Electrocardiography, Ambulatory
Heart Rate / physiology
Middle Aged
Syncope, Vasovagal / physiopathology*
Tilt-Table Test*

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