Page 8, Electrocardiography, Dr. D. Penney
The ECG (continued...)
Examining an ECG developed from lead II, one sees the largest P, R, and T waves (Table 16). This is because the angles of depolarization of the atria and ventricles fall close to (+) 60 degrees, the angle of this lead, while the angle of ventricular repolarization also approximates this value. ECG's in lead aVF will also usually show large R waves, since its angle is (+) 90 degrees. In contrast, the pattern in lead aVR shows inverted P and T waves for the same reasons, while the R wave is small and the S wave is a large negative deflection. No Q wave is seen. The ECG can easily be understood in this way.
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