Right atrial enlargement
Encyclopedia
Right atrial enlargement is a form of cardiomegaly
Cardiomegaly
Cardiomegaly is a medical condition wherein the heart is enlarged. It is generally categorized in the following manner:* Cardiomegaly due to dilation* Cardiomegaly due to ventricular hypertrophy** Left ventricular hypertrophy...

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It is characterized by a P wave
P wave (electrocardiography)
In electrocardiography, during normal atrial depolarization, the main electrical vector is directed from the SA node towards the AV node, and spreads from the right atrium to the left atrium...

height greater than 2.5 mm.
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