Abstract
Drinking alcohol is known to be one of the triggering factors of neurally-mediated syncope. Little is known about the diagnostic utility of the conventional and alcohol provocation head up tilt-test (HUT) in patients with alcohol-related syncope. We investigated the effect of the alcohol provocation HUT. We studied 12 patients (8 males, age 51 +/- 19 years) who had a history of unexplained post-alcohol ingestion syncope. An alcohol provocation protocol HUT (alcohol HUT), in which the protocol required 350 mL of 5% alcohol beer to be drunk over 5 min followed by positioning with the table tilted up for up to 30 min, was performed after the control and isoproterenol (ISP) HUT. None of the subjects (0/12) exhibited a positive response in the control HUT, and only one subject had a positive response (1/12; 8.3%) in the ISP HUT. In the alcohol HUT a positive response (9/12; 75%) increased in the patient group, whereas there were no positive responses in the normal control group. In the conventional HUT protocols, including ISP provocation, it was difficult to produce a positive response in the patients with alcohol-related syncope. Alcohol ingestion was a useful diagnostic provocation method in such patients.
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