When right atrial enlargement occurs, it does not take longer for cardiac action potentials to travel through the atrial myocardium (similar to left atrial enlargement). However, the amplitude of ...

There are a number of causes of a rightward axis, including: Right ventricular hypertrophy (associated with a tall R wave in lead V1 and often P pulmonale) Wolff-Parkinson-White pattern (short PR ...