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神经心源性晕厥的特征是突然出现短暂的意识丧失、低血压和心动过缓。头上倾试验是诊断神经心源性晕厥及评价药物疗效的一种公认可靠手段。本文对美托洛尔（metoprolol）与维拉帕米（verapamil）防止晕厥发作的效果进行了随机交叉对照研究。病人和方法顺序选择28例有晕厥病史且
Neurological cardioversion is characterized by the sudden onset of transient loss of consciousness, hypotension and bradycardia. Head tilt test is a proven and reliable means of diagnosing neurocardiogenic syncope and evaluating drug efficacy. This article conducted a randomized cross-controlled study of the efficacy of metoprolol and verapamil in preventing syncope. The order of the patients and methods 28 cases have a history of syncope