Abnormal P wave

What it means

Any anomaly of the P wave of the EKG, which results from atrial depolarization. The P wave occurs when the sinoatrial node creates an action potential that depolarizes the atria.

P waves are normally upright in leads I and II and inverted in aVR.

Rare diseases that can present with this6

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category