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If a Q wave is measured by ECG, the PR interval is also commonly termed the PQ interval.
Variations in the PR interval can be associated with certain medical conditions:
- A variable PR interval may indicate other types of heart block.
- 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