【摘要】 对连续就诊的２７例原因不明晕厥患者进行倾斜试验（ＨＵＴ），阳性者４例，阳性率为４／２７；阴性的２３例中有１６例加做异丙肾上腺素（ＩＳＯ）倾斜试验，阳性者１０例，阳性率为１０／１６；７例因不能耐受未能完成全程ＩＳＯ倾斜试验。基础倾斜试验及ＩＳＯ倾斜试验阳性者共１４例。试验表明，基础倾斜试验直立倾斜时间不宜短于４５ｍｉｎ，观察ＨＵＴ诱发晕厥前有否心动过速有助于药物选择。更多还原

【Abstract】 The head-up tilt testing(80 degrees,45 minutes)was performed in 27 patients with syncope of unknown origin,the baseline head-up tilt test was positive in 4 of 27 patients 4/27(15%). Ten of 16 Patients (10/16) had a positive response during Isoproterenol infusion plus head-up tilt testing.In conclusions our finding,(1) head up tilt test is a useful method for evaluating syncope unknown origin;(2)the duration of baseline tilt test must be not less than 45 minutes;(3) whether patients had tachycardia before syncope during head-up tilt testing may benefit the selection of drugs.The disadvantage of iso-proterenal was discussed.更多还原