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Which Wave Represents Atrial Repolarization?

Marcus Vance • • 7 min read
Which Wave Represents Atrial Repolarization?

In sinus rhythm, the observed Ta wave in the PR segment represents the early part of atrial repolarization. Generally, part of the Ta wave is superimposed onto the QRS complex

QRS complex
QRS duration is measured from the beginning of the Q wave to the end of the S wave. A normal range is from 40 to 100 milliseconds (1 small box to 2.5 small boxes). Modern EKG equipment permits the EKG recordings to be obtained in a digital format and stored in a computer readable form.
and the ST-segment (4).

Is P wave atrial repolarization?

The P wave represents the depolarization of the left and right atrium and also corresponds to atrial contraction. Strictly speaking, the atria contract a split second after the P wave begins. Because it is so small, atrial repolarization is usually not visible on ECG.

Where is the wave representing atrial repolarization?

There is no distinctly visible wave representing atrial repolarization in the ECG because it occurs during ventricular depolarization. Because the wave of atrial repolarization is relatively small in amplitude (i.e., has low voltage), it is masked by the much larger ventricular-generated QRS complex.

Marcus Vance
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Marcus Vance

Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.