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.
|主出版物標題||Computing in Cardiology|
|出版狀態||已發佈 - 2010|
|事件||Computing in Cardiology 2010, CinC 2010 - Belfast, 英国|
持續時間: 9月 26 2010 → 9月 29 2010
|其他||Computing in Cardiology 2010, CinC 2010|
|期間||9/26/10 → 9/29/10|
ASJC Scopus subject areas