Oreto G, Satullo G, Luzza F, Arrigo F
Pacing Clin Electrophysiol. 1987 Jan;10(1 Pt 1):100-2. doi: 10.1111/j.1540-8159.1987.tb05929.x.
A patient with 2:1 AV block underwent temporary ventricular pacing. All the paced stimuli resulted in ventricular capture, but a marked variability in morphology of the paced QRS complexes occurred. Two different types of paced QRS complex (labeled A and B) were recognized. Type B complexes were manifest only when the pacing stimulus was preceded by a sinus P wave within a time interval ranging from 0.15 to 0.52 sec. The P wave-induced changes in morphology of the paced QRS complexes were interpreted as due to displacement of the pacing ventricular lead caused by atrial systole.
一名患有2:1房室传导阻滞的患者接受了临时心室起搏。所有起搏刺激均导致心室夺获，但起搏QRS波群的形态出现了明显变化。识别出两种不同类型的起搏QRS波群（标记为A和B）。仅当起搏刺激之前在0.15至0.52秒的时间间隔内出现窦性P波时，B型波群才会出现。P波引起的起搏QRS波群形态变化被解释为心房收缩导致起搏心室导线移位所致。
