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预激综合征伴发的室上阵发性心动过速(PS-VT)与折返原理有关。其折返环路多位于房室之间,既包括心房,也包括心室。因此,称之为房室反复(折返)性心动过速(AVRT)为宜。一、AVRT分型及发生机理按房室旁路的部位和预激的方向,AVRT可分为以下类型: 1.顺向型:是指房室交界区呈顺向传导,房室旁路呈逆向传导的AVRT。其折返环路为:心房→房室交界区→心室→房室旁路→心房。据电生理研究,房室旁路不存在递减性传导,其顺向性传导速度较快,有效不应期较长。反之,房室结呈递减
Pre-excitation syndrome with paroxysmal supraventricular tachycardia (PS-VT) and the principle of reentry. The reentry loop and more in the atrioventricular, both the atrium, including the ventricle. Therefore, it is called atrioventricular (reentry) tachycardia (AVRT) is appropriate. AVRT classification and mechanism According to the location of atrioventricular bypass and pre-excitation direction, AVRT can be divided into the following types: 1. Forward type: refers to the atrioventricular junction is a forward conduction, atrioventricular bypass was Reverse conduction of AVRT. The reentry loop is: atrial → atrioventricular junction area → ventricular → atrioventricular bypass → atrium. According to electrophysiological studies, there is no descending atrioventricular conduction, its forward conduction velocity is faster, effective refractory period is longer. Conversely, AV node decreased