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预激(WPW)综合征引起的房室反复性心动过速,常有相差大于30毫秒的周期长度(CL)突然改变。这种变化,一种原因是折返环路发生改变,如旁道同侧的束支阻滞时,折返改从对侧束支逆传,或患者同时有房室结双径路时,折返激动从房室结的快、慢径路交替下传。另一原因是折返环路不变,但环路中某一处的传导速度起变化。本文对82例WPW患者作电生理研究,用心房起搏或心房期前刺激诱发反复性心动过速。21例(26％)有周期长度突然改变。其中13例为显性WPW,8例为隐性WPW.旁道位于左侧的15例、右侧3例、间隔区2例,另1例有2条旁道。12例周期变化伴有QRS形态改变,共中11例是旁道同侧的束支阻滞所造成,另1例为双旁道。8例周期改变
Atrioventricular tachyarrhythmias caused by WPW syndrome often have sudden changes in the length of the cycle (CL) that differ by more than 30 milliseconds. One reason for this change is that the reentrant loop changes, such as when the bundle branch of the ipsilateral bypass block retreat, retrograde change from the contralateral bundle retrograde, or patients with both atrioventricular node dual path, the rejoinder from Atrioventricular node fast, slow path alternately pass. Another reason is that the reentry loop does not change, but the conduction velocity varies somewhere in the loop. In this paper, 82 cases of WPW patients for electrophysiological studies, atrial pacing or atrial pre-stimulation induced recurrent tachycardia. 21 cases (26%) had a sudden change in the length of the cycle. Among them, 13 cases were dominant WPW and 8 cases were recessive WPW.The accessory pathways were located on the left side in 15 cases, right side in 3 cases, spacer area in 2 cases and the other one in 2 cases. 12 cases of periodic changes associated with QRS morphological changes, a total of 11 cases of ipsilateral bundle branch block caused by the other side of the double bypass. 8 cases of periodic changes