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答:目测电轴应以能明确判断电轴是否异常的方法为优。正常电轴是0°—+90°,一般教科书上的目测方法是根据Ⅰ、Ⅲ导联。众所周知,Ⅲ导联的导联轴是+120°,故只要额面QRS的电轴小于+30°,即可出现Ⅲ导联QRS主波向下,被判断为电轴左倾,实际上此时电轴可能仍大于0°,不及用Ⅰ与aVF目测为佳。aVF的导联轴是+90°,若QRS在Ⅰ导联主波向上,在aVF主波向下,此时电轴必小于0°,可肯定电轴左倾。若Ⅰ导联主波向下,aVF主波向上,则
A: The visual axis should be able to clearly determine whether the electric axis is abnormal or not. The normal electrical axis is 0 ° - + 90 °, the visual methods generally textbooks are based on Ⅰ, Ⅲ lead. As we all know, the lead axis of the lead is + 120 °, so long as the electrical axis of the frontal QRS is less than + 30 °, the lead of the lead III of QRS leads downwards and is judged as the left-leaning of the electrical axis. In fact, The electrical axis may still be greater than 0 °, less than I and aVF visually better. aVF lead axis is + 90 °, if the QRS lead in the Ⅰ lead upward, the main wave in the aVF down, then the axis must be less than 0 °, you can be sure that the left axis of the electrical. If lead Ⅰ main wave down, aVF main wave up, then