Modifications of autonomic activity and baroreceptor response during tilt-induced vasovagal syncope

Chun An Cheng, Jiunn Tay Lee, Hung Wen Chiu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Vasovagal syncope (VVS) is diagnosed by medical history and confirmed by head-up tilt (HUT) test. In this study, we attempted to examine this controversy by evaluating heart rate variability and baroreceptor sensitivity in VVS during upright posture. The VVS subjects had lower total peripheral vascular resistance at baseline supine and HUT position. During HUT test, the VVS subjects had increased LF/HF ratio and decreased baroreceptor sensitivity. In conclusion, VVS subjects demonstrated vascular sympathetic dysfunction and postural cardiac sympathetic hyperactivity. The decreased baroreceptor sensitivity may explain in part the failure of the usual compensatory heart rate increase during orthostatic challenge.

Original languageEnglish
Title of host publicationComputing in Cardiology 2010, CinC 2010
Number of pages4
Publication statusPublished - 2010
EventComputing in Cardiology 2010, CinC 2010 - Belfast, United Kingdom
Duration: Sept 26 2010Sept 29 2010

Publication series

NameComputing in Cardiology
ISSN (Print)2325-8861
ISSN (Electronic)2325-887X


OtherComputing in Cardiology 2010, CinC 2010
Country/TerritoryUnited Kingdom

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • General Computer Science


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