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In electrocardiography, the interval PR is the period, measured in milliseconds, extending from the beginning of the P wave (atrial depolarization onset) to the beginning of the QRS complex (onset of ventricular depolarization)); usually between 120 and 200ms in duration. The PR interval is sometimes called the PQ interval.
Video PR interval
Interpretation
Variations in the PR interval can be attributed to certain medical conditions:
- Duration
- Older PR interval (over 200 ms) may show first-degree heart block. Extension may be associated with hypokalemia, acute rheumatic fever, or carditis associated with Lyme disease.
- Shorter PR interval (less than 120ms) may be associated with Wolff-Parkinson-White syndrome, Lown-Ganong-Levine syndrome, or junctional rhythm.
- Variable PR intervals may indicate other types of heart block.
- Depression of the PR segment may show atrial or pericarditis injury.
- The morphology of the P wave variable in a lead ECG is suggestive of the rhythm of an ectopic pacemaker such as a roaming pacemaker or a multifocal atrial tachycardia.
Maps PR interval
References
Source of the article : Wikipedia
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