Left axis deviation occurs when the QRS axis falls between -30 and -90. There are a variety of causes, including left anterior fascicular block and left ventricular hypertrophy. See the ECG basics ...

or LAD), rightward (right axis deviation, or RAD) or indeterminate (northwest axis). The QRS axis is the most important to determine. However, the P wave or T wave axis can also be measured.

In a “normal” electrocardiogram (ECG), the transition of the QRS axis in the precordial ... of other mild ECG abnormalities, including axis deviation, ST depression, atrial fibrillation ...

Normal ECGs include common, training-related findings in athletes such as high QRS amplitude meeting voltage criteria ... pathological Q-waves, left axis deviation and conduction delays and findings ...