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心电图的QRS波代表心室除极过程,其宽度也称QRS波时限。临床中,根据QRS波时限是否≥120ms,而将心动过速分为宽QRS波心动过速和窄QRS波心动过速。宽QRS波心动过速包括:室速、室上速伴差异传导或原有束支阻滞(或非特异性室内阻滞)、逆向型房室折返性心动过速、房颤伴旁路前传及起搏相关性心动过速等。其中,室速是宽QRS波心动过速的最常见原因,约占全部原因的80%,而仅5%的室速QRS波时限小于120ms。因而,
ECG QRS wave represents the ventricular depolarization process, also known as the width of the QRS wave duration. Clinical, according to QRS wave duration is ≥ 120ms, and the tachycardia is divided into wide QRS tachycardia and narrow QRS tachycardia. Wide QRS tachycardias include: ventricular tachycardia, supraventricular tachycardia accompanied by differential conduction or original bundle branch block (or non-specific block), reverse atrioventricular reentrant tachycardia, atrial fibrillation with pre anterior pass and Pacing-related tachycardia and so on. Among them, VT is the most common cause of wide QRS tachycardia, accounting for about 80% of all causes, whereas only 5% of VT VTQs are less than 120 ms. thus,