预激综合征在心电图上的显现取决于旁路的前向传导功能。在旁路前向传导快于正路时,心电图有明显的预激波。若旁路有前向传导阻滞(单向阻滞),只能逆行传导,临床上虽有阵发性心动过速反复发作,但在常规心电图中不能显现,称之为隐匿性预激综合征,其诊断的确立主要依靠心室刺激的心内电生理检查。近几年来用调搏方法,又证实了另一种旁路传导情况,即旁路虽有前向传导能力,但在常规心电图中无预激表现, The appearance of Wolff-Parkinson-White syndrome on the electrocardiogram depends on the forward conduction function of the shunt. In the bypass before the conduction is faster than the main circuit, ECG obvious pre-shock wave. If the bypass has an anterior block (unidirectional block), can only be retrograde conduction, although clinical recurrent paroxysmal tachycardia, but in conventional ECG can not be found, called occult pre-excitation synthesis Levy, the diagnosis established mainly rely on ventricular electrophysiological examination. In recent years with the pacing method, but also confirmed another bypass conduction situation, that is, although the bypass bypass capacity, but no pre-excitation in the conventional ECG performance,