目的探讨三步法直立倾斜试验(HUT)诊断血管迷走性晕厥(VVS)的可行性。方法对临床不明原因晕厥的89例患者行HUT,试验分3个步骤,即基础倾斜试验(BHUT)、舌下含服硝酸甘油倾斜试验(SNHUT)、异丙肾上腺素倾斜试验(IHUT)。结果89例患者中HUT阳性61例,阳性率为68.54%,其中基础直立倾斜试验阳性13例(14.61%),舌下含服硝酸甘油阳性44例(57.89%),含服硝酸甘油阴性的11例中静点异丙肾上腺素阳性4例(36.36%)。结论三步法直立倾斜试验是诊断血管迷走性晕厥的可行方法。该方法可靠简便,可提高阳性率。 Objective To investigate the feasibility of three-step erect tilt test (HUT) in the diagnosis of vasovagal syncope (VVS). Methods HUT was performed in 89 patients with unexplained syncope. The trial consisted of three steps: basal tilt test (BHUT), sublingual nitroglycerin tilt test (SNHUT) and isoproterenol tilt test (IHUT). Results The positive rate of HUT in 89 patients was 61 (68.54%), of which 13 (14.61%) were positive for basal tilt test, 44 were sublingual nitroglycerin (57.89%), 11 were negative for nitroglycerin Cases of static point isoproterenol 4 cases (36.36%). Conclusion Three-step erect tilt test is a feasible method to diagnose vasovagal syncope. The method is reliable and easy, can increase the positive rate.