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Right Atrial Enlargement Right Atrial Enlargement (Example 1) Right Atrial Enlargement (Example 2) Right Atrial Enlargement (Example 3) Right Atrial Enlargement (Example 4) When right atrial enlargement occurs, it does not take longer for cardiac action potentials to travel through the atrial myocardium (such as in LAE), however the amplitude of the P wave is exagerated since the hypertrophied right atrial myocardium is so close the the SA node (referred to as p-pulmonale since lung disease can causes severe right heart strain and RAE). Thus the thus the P wave height becomes larger. Thus the criteria for diagnosing RAE on EKG is as follows: 1) The P wave amplitude in lead II greater than 2.5 millimeters OR 2) The upward deflection of the P wave in lead V1 greater than 1.5 millimiters in amplitude.  |
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