Objective:To evaluate the value of sublingual isosorbide dinitrate (ISDN) adminstration before tilt table test (TTT) as a simple practice test for diagnosis of vasovagal syncope(VVS).

• 目的:探讨直立倾斜试验(TTT)前舌下含服硝酸异山梨酯(ISDN)对诊断血管迷走性晕厥的价值。