1. N,N-di-isopropyl-N′-isoamyl-N′-diethylaminoethylurea (P-286) and congeners abolished the vasodepressor response to vagal stimulation with little effect on that to intravenous acetylcholine.

2. 14 ConclusionMost of the post-exercise syncope were vasodepressor syncope. TTT is the first choice to distinguish post-exercise syncope with a negative tread-mill exercise testing.

3. 12 Results Of the 186 post-exercise syncope patients, 141 had a positive TTT results(81%), most of them were male(102/. Most of the syncope were vasodepressor syncope(106/.