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房室结双径路的患者,其房室交界区有两条传导通路。二者的电生理特性不同,一条为快通路,其传导速度较快,一般不应期较长;另一条为慢通路,其传导速度较慢,但一般不应期较短。在一定条件下,二者可形成折返环路,易发生房室结折返性心动过速。此种心动过速分两种,一种经慢通路下传,快通路回传,此型最为常见;另一种为不典型型,即经快通路下传而经慢通路回传,此型少见,约占5％。射颜消蚀技术进行房室结改良术的主要目的就是选择性阻断其中一条通路(多为慢通路),从而破坏形成折返的条件,防止发生折返性心动过速。一、房室结改良的步骤一般按以下六个步骤
Atrioventricular node dual pathway patients, the atrioventricular junction area has two conductive pathways. The electrophysiological characteristics of the two different, a fast pathway, the conduction velocity is faster, the general refractory period is longer; the other is a slow pathway, the conduction velocity is slower, but the general refractory period is shorter. Under certain conditions, the two can form reentrant loop, prone to atrioventricular nodal reentrant tachycardia. This type of tachycardia in two, one through the slow pathway, fast pass back, this type is the most common; the other is atypical, that is, through the fast pass down and slow pass back, this type Rare, about 5%. The main purpose of atrioventricular nodal enhancement is to selectively block one of the pathways (mostly slow pathways), thereby undermining the conditions for the formation of reentry and preventing the occurrence of reentrant tachycardia. First, the steps to improve the atrioventricular node generally according to the following six steps