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预激旁道引发的室上速,当心率太快时可合并右束支或左束支功能性阻滞,使顺向型房室折返性心动过速变为宽QRS波心动过速,QRS波时限≥l20ms,同时,心动过速时的RR间期值可以随之改变,也可能无变化。1973年,法国心电图与电生理专家Coumel提出,应用体表心电图结合心动周期值的变化可确定预激旁道位于左侧或右侧。判断常根据患者合并与不合并束支阻滞时,两种心动过速心动周期值的变化,当心动过速合并完全性左束支阻滞(左图),且心动周期的延长
Pre-excitation bypass caused by supraventricular tachycardia, when the heart rate too fast can be combined with right bundle branch or left bundle branch block, so that atrioventricular reentrant tachycardia wide QRS tachycardia, QRS Wave time limit ≥ 120ms, meanwhile, tachycardia RR interval value may change, may not change. In 1973, Coumel, an electrocardiogram and electrophysiologist in France, suggested that changes in the body surface electrocardiogram combined with cardiac cycle values should confirm that the pre-shunt bypass is located to the left or right. Judgment is often based on patients with and without bundle branch block, the two cardiac tachycardia cycle changes, when the tachycardia with complete left bundle branch block (left), and the extension of cardiac cycle