Head-up Tilt Test for Assessing Complications of Neurally Mediated Syncope and Other Causes of Unconsciousness: Case Series

We investigated NMS with coexisting disease. We examined 63 cases by using the head-up tilt test HUT to diagnose unexplained syncope between 1998 and 2001. Drug free HUT durations of 20 min at 60; was used. If there was negative study by drug free HUT, Isoproterenol protocol during HUT was used as an additional tool for eliciting. Twenty seven cases out of 63 were diagnosed as NMS. 9 cases out of 27 diagnosed as NMS complicated with other causes for syncope, which included 2 cases of epilepsy, 2 cases of tachycardic arrhythmia, and 5 cases of bradycardic arrhythmia. In conclusion, it is important to keep in mind that the symptoms of NMS may be seen as complications in various diseases that can cause unconsciousness.