Why is atrial repolarization not illustrated on an ECG?
A) Only ventricles repolarize.
B) It is obscured by the T wave.
C) Ventricular repolarization occurs at the same time and is much stronger.
D) The QRS complex masks it.
E) It is illustrated as the P wave.

Question

Quizplus · Accepted Answer

Atrial repolarization is not visible on an ECG because it occurs at the same time as the QRS complex, which represents ventricular depolarization. The electrical activity associated with atrial repolarization is masked by the larger electrical activity of the ventricles depolarizing.

Why Is Atrial Repolarization Not Illustrated on an ECG