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5在稳定的折返性心动过速的折返环路中,折返波(波锋到波尾)持续不断地做着环形运动,而维持环形折返运动的必需条件是折返波波锋前方的心肌组织一定处于兴奋期,随时可被波锋激动,即前行传导的波锋电活动能使该心肌组织除极,使折返波的波锋继续前传。折返环中,处于兴奋期的心肌组织(图中圆圈中的白色
5 In a reentry circuit of stable reentrant tachycardia, the reentry wave (wave front to wave tail) continues to perform a circular motion while the necessary condition for maintaining the circular reentry motion is to rewind the anterior myocardial tissue of the wave front In the excitement period, at any time can be excited by wave front, that forward conduction of wave front electrical activity can make the myocardial tissue depolarization, the wave front of the reentry wave continues. Reentry ring, in the excitement of myocardial tissue (circle in the white