论文部分内容阅读
【答】正常人心室肌的除极,由于左束支的分叉略先于右束支,故心室除极的初期,除极波从室间隔中1/3左侧心内膜面,靠近心尖和左侧小梁肌开始,从左向右,瞬间向量指向右前方,历时约10毫秒。于30毫秒时,左右心室均在进行除极。40毫秒时,右室除极完毕。左室继续除极,心肌的除极面从左室的心内膜推向心尖,瞬间向量突出地指向左后方。60～80毫秒,剩余左室基底部的后壁、室间隔的基底部和右室游离壁的基底区仍在进行除极,其瞬间向量一般指向后上方,也可略向左或右。因此,正常右心前导联V_1呈现rS波或rSr′波;左心前导联V_5呈现qRs波或qR波形。QRS波的除极时间不应超过100毫秒。
[A] normal ventricular remodeling, due to the left bundle branch bifurcation slightly ahead of the right bundle branch, so the initial ventricular depolarization, in addition to polar wave from the left ventricular septal 1/3 endocardial surface, near Apical and left trabecular muscle begins, left to right, instantaneous vector points to the right front, which lasted about 10 milliseconds. At 30 milliseconds, the left and right ventricles are undergoing depolarization. 40 milliseconds, right ventricular depolarization is completed. Left ventricular depolarization, myocardial depolarization from the left ventricular endocardial push to the apex, the instantaneous vector prominent point to the left rear. 60 to 80 milliseconds, the remaining left ventricular base of the posterior wall of the base of the ventricular septal and free basal area of the right ventricular wall is still under depolarization, the instantaneous vector generally points to the top, but also slightly left or right. Therefore, the normal right ventricular lead V_1 showed rS wave or rSr ’wave; left ventricular lead V_5 showed qRs wave or qR waveform. QRS wave depolarization time should not exceed 100 milliseconds.