Objective The purpose of this study was to clarify the mechanism of 2:1 atrioventricular block (AVB) during AV node reentrant tachycardia (AVNRT) induced during electrophysioloic study.

• 目的本研究探讨电生理检查时诱发的房室结折返性心动过速（AVNRT）伴2:1AVB的机制和阻滞部位。收藏指正