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一、阵发性室上性心动过速(PSVT) 是指起源于希氏束以上的心动过速,按其发生机制可分为三型。 (一)折返型室上速 (1)房室结折返性心动过速(AVNRT),此型最常见。其由房室结内纵向分离的慢、快通道形成折返径路。常见的为慢通道前传型,而由快通道前传的非典型AVNRT少见。(2)房室反复性心动过速(AVRT)。折返环包括心房、心室、房室结和房室旁道(Kent束)。可分为经房室结前传的顺向型和经旁道前传的逆向型二种,前者占90％。隐匿型预激因其旁道仅有逆向传导能力,窦性心律
First, paroxysmal supraventricular tachycardia (PSVT) refers to the origin of more than His bundle beam tachycardia, according to its mechanism can be divided into three types. (A) reentry superficial (1) atrioventricular nodal reentrant tachycardia (AVNRT), this type is the most common. The longitudinal separation of the atrioventricular node from the slow, fast channel to form a return path. Commonly known as slow channel pre-transmission type, but by the fast-track prevalent atypical AVNRT rare. (2) atrioventricular tachycardia (AVRT). Reentry rings include the atrium, ventricle, atrioventricular node, and Kent tract. Can be divided into the antecedent of the anterior chamber of the forward type and by-pass pre-pass reverse type two, the former accounted for 90%. Occult pre-excitation because of its bypass only reverse conduction capacity, sinus rhythm