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一、正常Q波是指QRS波群的初始部分的波形,即心室除极最早的部分投影于某些导联轴的负侧,所形成的一个小的向下(负向)的波,称为Q波。正常成人在左胸前导联(V_(5-6))及某些肢体导联(Ⅲ、aVF或aVL)可出现q波,这种小的q波称为间隔性q波。由于间隔除极时间暂短,故一般不超过0.03秒,其深度不大于R/4。正常间隔除极向量的方向是向右前上、
First, the normal Q wave refers to the initial part of the QRS wave group waveform, that is, the earliest part of the ventricular depolarization projection on the negative side of some lead axis, the formation of a small downward (negative) wave, said Q waves. Normal adults in the left chest lead (V_ (5-6)) and some limb leads (Ⅲ, aVF or aVL) can occur q-wave, this small q-wave called intermittent q-wave. As the interval depolarization time is short, it is generally not more than 0.03 seconds, the depth is not greater than R / 4. The normal interval depolarization vector direction is to the right front,