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In case a Q wave was measured with an ECG, the PR interval is also commonly named "PQ interval" instead.
Variations in the PR interval can be associated with certain medical conditions:
- PR segment depression may indicate atrial injury or pericarditis.
- Variable morphologies of P waves in a single ECG lead is suggestive of an ectopic pacemaker rhythm such as wandering pacemaker or multifocal atrial tachycardia