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心房除极、心室除极或复极的整个过程,瞬间向量不断变化,将其综合为一个向量,以说明在一个总时间内的平均方向和强度,即为P、QRS或T波的平均电轴。在心电图学中,如未作特别说明,一般仅指QRS波群在前额面的平均电轴而言。由于其方向比长度对诊断具有更重要的意义,故近年来测定心电轴的角度,为阅读心电图必测内容之一。目前皆依据Einthoven氏正三角形假说测定心电轴(本文简称为正电轴)。
In the whole process of atrial depolarization, ventricular depolarization or repolarization, the instantaneous vector continuously changes and is synthesized into a vector to show the average direction and intensity in a total time, ie, the average power of P, QRS or T waves. axis. In electrocardiography, if not specifically stated, it generally refers only to the average electric axis of the QRS complex on the frontal plane. Because its direction is more important than the length of the diagnosis, so in recent years to determine the angle of the heart axis, one of the must-read content for reading ECG. At present, the electrocardiographic axis is determined according to the Einthoven’s regular triangle hypothesis (herein abbreviated as positive electromagnet axis).