Timing of positive head-up tilt test for patients with suspected vasovagal syncope
10.3760/cma.j.issn.0253-3758.2011.06.004
- VernacularTitle:对拟诊血管迷走性晕厥患者进行直立倾斜试验的时程
- Author:
Jun LIU
1
;
Yue LIU
;
Guo-Ying LU
;
Zhi LI
;
Xiao-Feng LI
;
Yu-Shan WANG
;
Pi-Hua FANG
Author Information
1. 中国医学科学院,北京协和医学院,心血管病研究所,阜外心血管病医院
- Keywords:
Syncope,vasovagal;
Head-up tilt test
- From:
Chinese Journal of Cardiology
2011;39(6):494-496
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the time course of positive head-up tilt test (HUTT) for patients with suspected vasovagal syncope.Methods Consecutive patients referred to the syncope unit of our center for recurrent unexplained syncope were included. The HUTT consisted of a 30 minute passive basic phase and a 20 minute sublingual nitroglycerin provocation phase if syncope did not develop during the passive phase.Results Positive HUTT was observed in 427 out of 773 consecutive patients (55.2%) patients including 43 patients (10.1%) during the passive basic phase and 384 patients (89.9%) during the nitroglycerin provocation phase. During the basic phase, the positive Hutt developed at 7.5 minute (n=2) and peaked at 22.5 th minute (20.9%, n=9) and then decreased gradually. Most positive reactions (93.0%, n=40) occurred between the 10 and 25 minutes during the basic phase. During the nitroglycerin provocation phase, the percentage of positive reactions increased rapidly after sublingual nitroglycerin, peaked at the 10th minute (35.7%, n=137) and decreased thereafter. Most positive reactions (96.1%, n=369) occurred within the first 15 minutes of provocation phase.Conclusion The appropriate duration for HUTT test could be modified to a 25 minutes passive basic phase plus 15 minutes nitroglycerin provocation phase.
