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采用基础倾斜试验及多阶段异丙肾上腺素倾斜试验（ Ｍ Ｉ Ｔ Ｔ） 检测不明原因晕厥９７ 例，健康成人９ 例。结果：健康对照组直立倾斜试验 Ｔ Ｔ均阴性（ Ⅰ组） ，不明原因晕厥中 Ｔ Ｔ 阴性占２０ ．７ ％ （ Ⅱ组） ， Ｂ Ｔ Ｔ阳性占２２ ．８ ％（ Ⅲ组） ， Ｍ Ｉ Ｔ Ｔ 阳性占５６ ．５ ％ （ Ⅳ组） 。倾斜前各组间收缩压（ Ｓ Ｂ Ｐ） 、舒张压（ Ｄ Ｂ Ｐ） 及心率（ Ｈ Ｒ） 均无差异。倾斜时， Ｈ Ｒ：Ⅰ、Ⅱ、Ⅲ、Ⅳ组均显著增加， Ｓ Ｂ Ｐ：Ⅰ、Ⅳ组轻度下降， Ｄ Ｂ Ｐ：Ⅰ组轻度升高。Ⅲ组、Ⅳ组阳性反应时， Ｓ Ｂ Ｐ、 Ｄ Ｂ Ｐ和 Ｈ Ｒ 均较前显著下降。结论： Ｔ Ｔ 是诊断血管迷走性晕厥安全的方法。
Ninety-seven cases of unexplained syncope and nine healthy adults were detected by basic tilt test and multislice isoproterenol tilt test (MITT). Results: The T T of the healthy control group was negative (Ⅰ group) in the upright tilt test, and T T was negative in the unexplained syncope. 7% (group Ⅱ), B T T positive accounted for 22%. 8% (Ⅲ group), M I T T positive accounted for 56. 5% (group Ⅳ). There were no differences in systolic blood pressure (SBP), diastolic blood pressure (DBP), and heart rate (HR) between groups before tilting. Tilt, H R: Ⅰ, Ⅱ, Ⅲ, Ⅳ group were significantly increased, S B P: Ⅰ, Ⅳ group decreased slightly, DBP: Ⅰ group increased slightly. Ⅲ B, Ⅳ group positive reaction, S B P, D B P and H R were significantly decreased compared with the previous. Conclusion: T T is a safe method to diagnose vasovagal syncope.