Atrial and ventricular depolarization and repolarization are represented on the ECG as a series of waves: the P wave followed by the QRS complex and the T wave. The first deflection is the P wave associated with right and left atrial depolarization. Wave of atrial repolarization is invisible because of low amplitude..
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An evaluation of the ratio of P-wave duration to P-R segment in the diagnosis of atrial enlargement.
The deflection/wave is the P wave. When the SA node triggers a cardiac impulse, the atrial fibers depolarize, producing an electrical change..
The P-wave axis is a standard automated measure reported on the 12-lead electrocardiogram ECG that reflects the net vector component of atrial depolarization .