This study was designed to assess the value of tilt table test in diagnosing vasovagal syncope (VVS). Fifty- five consecutive patients with VVS and 20 healthy controls underwent 60 degree Head - up tilt test (HuT)

a single-stage Isoproterenol tilt table test (ISO - HuT) or/and Nitroglycerin tilt table test (NIT- HuT) Results: The number of positive cases for HuT

ISO- HuT and NIT-HuT were 4 in 55

16 in 51 and 8 in 30 patients group compared with 2 in 20

1 in 18 and 3 in 18 healthy control group

Therofore the sensitivity of HuT

ISO- HuT and NIT- HuT was 7%

32% and 27%

respectively

and the specificity was 90%

94% and 82%

respectively. HuT is a valuable

safe and feasible method of diagnosing VVS

The use of ISO and NIT could increase the sensitivity of table tilt test

with the same high specificity

NIT-HuT is easy to be accepted becaues of few side effects.