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AVNRT的解剖基础尚存异议,但心动过速的电生理机制和特点已较明确。慢-快型AVNRT占90％,鉴别诊断主要涉及窦房折返性心动过速(SART)、房内折返性心动过速(IART)和顺向型房室折返性心动过速(AVRT)。快-慢型AVNRT占10％,主要需与以“慢旁道”逆传的AVRT鉴别,二者是恒定性交界性心动过速(PJRT)的主要类型。一、SART和IART SART、IART和AVNRT均为阵发性室上性心动过速。三者的心电图(ECG)表现有各自的特点(见附表),据此可作出鉴别诊断,一般不需进行电生理鉴别。
The anatomic basis of AVNRT remains objectionable, but the electrophysiological mechanism and characteristics of tachycardia have been more clear. Slow-fast AVNRT accounts for 90% of the total. Differential diagnosis mainly involves SART, IART, and AVRT. Fast-slow AVNRTs account for 10% of the time and are mainly associated with AVRTs that are “slow bypass” retrograde, both of which are the principal types of persistent borderline tachycardia (PJRT). First, SART and IART SART, IART and AVNRT are paroxysmal supraventricular tachycardia. The three ECG (ECG) performance has its own characteristics (see Schedule), which can make differential diagnosis, generally do not need electrophysiological identification.