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In electrocardiography, the PR interval is the period, measured in milliseconds, that extends from the beginning of the P wave (the onset of atrial depolarization) until the beginning of the QRS complex (the onset of ventricular depolarization); it is normally between 120 and 200ms in duration. The PR interval is sometimes termed the PQ interval.
Video PR interval
Interpretation
Variations in the PR interval can be associated with certain medical conditions:
- Duration
- A long PR interval (of over 200 ms) may indicate a first degree heart block. Prolongation can be associated with hypokalemia, acute rheumatic fever, or carditis associated with Lyme disease.
- A short PR interval (of less than 120ms) may be associated with Wolff-Parkinson-White syndrome, Lown-Ganong-Levine syndrome, or Junctional rhythms.
- 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 EKG lead is suggestive of an ectopic pacemaker rhythm such as wandering pacemaker or multifocal atrial tachycardia.
Maps PR interval
References
Source of the article : Wikipedia
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