The axis of the ECG is the major direction of the overall ... The QRS axis is thus between these two arrows, which falls within the normal range. If the QRS is upright in lead I (positive) and ...

The goal of ECG interpretation in athletes is to classify the ECG as: (1) ‘normal’—no further evaluation needed or (2 ... These include findings suggestive of cardiomyopathy such as T-wave inversion, ...

there are a variety of atypical ECG patterns, often called 'normal variants', that can occur in perfectly normal individuals. SCD is most often due to an extremely rapid and uncoordinated cardiac ...

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 ...