预激综合征可以合并右束支或左束支阻滞,但附加旁道位于束支阻滞的同侧或对侧的心电图表现截然不同。当束支阻滞合并同侧旁道预激时,其束支阻滞可被掩盖,仅当预激间歇时才能显示出来;而束支阻滞合并对侧旁道预激时,则QRS波增宽伴有预激波及终末传导延缓.我报道1例特少见的预激 WPW syndrome can be combined with right bundle branch or left bundle branch block, but the additional bypass located in the ipsilateral or contralateral bundle branch block ECG performance very different. When the bundle branch block combined ipsilateral bypass pre-excitation, the bundle branch block can be masked, only when the pre-excitation interval can be displayed; and bundle branch block with the contralateral bypass pre-excitation, the QRS wave Widened with pre-shock and terminal conduction delay.I reported a rare case of pre-excitation