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对象：１．研究组：８０例不明原因晕厥病人。２．对照组：１３例无晕厥病史正常人。倾斜试验（ＴＴＴ）方案：采用倾斜７０度最长观察３０分钟（ＢＴＴＴ），继之静滴异丙肾上腺素（ＩＳＯ）１～５μｇ／分钟，仍倾斜７０度最长观察３０分钟（ＩＴＴＴ）。结果：１．研究组和对照组基础心率和血压差异无显著性（ｐ＞０．０５）。２．研究组ＴＴＴ阳性５１例，其中ＢＴＴＴ阳性１８例，ＩＴＴＴ阳性３３例，ＩＳＯ平均用量２．３１±０．８２μｇ／分钟，在ＩＴＴＴ阳性者中仅１例ＩＳＯ用量达４μｇ／分钟。３．对照组１３例，１例ＩＴＴＴ阳性。ＩＳＯ平均用量２．７７±１．３μｇ／分钟，ＩＳＯ用量与研究组比较差异无显著（ｐ＞０．０５）。结论：本试验结果的敏感性为６３．８％，特异性９２．３％。合用异丙肾上腺素使ＴＴＴ阳性率明显提高，但异丙肾上腺素用量以不大于３μｇ／分钟为宜。
Objects: 1. Study Group: 80 patients with unexplained syncope. 2. Control group: 13 cases without syncope history of normal people. Tilting Test (TTT): Tilting at a maximum of 70 degrees for 30 minutes (BTTT), followed by intravenous infusion of isoproterenol (ISO) at 1 to 5 μg / minute and an inclination of 70 degrees for a maximum of 30 minutes (ITTT). Results: 1. There was no significant difference in basal heart rate and blood pressure between study group and control group (p> 0.05). 2. In the study group, TTT was positive in 51 cases, of which 18 were BTTT positive, 33 were ITTT positive, and the average ISO dosage was 2.31 ± 0.82 μg / min. Only 1 patient with ITTT positive had an ISO dosage of 4 μg / min. 3. Control group, 13 cases, 1 case of ITTT positive. The average ISO dosage was 2.77 ± 1.3μg / min. There was no significant difference in ISO dosage between the two groups (p> 0.05). Conclusion: The results of this test were 63.8% with a specificity of 92.3%. Combination of isoproterenol TTT positive rate was significantly increased, but the amount of isoproterenol to not more than 3μg / min is appropriate.