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PR interval

Normal findings
1. Interval: 0.12 to 0.20
Prolonged PR interval
1. AV Node Block
2. Hyperthyroidism (occasional)
3. Normal variant (rarely)
Shortened PR interval
1. AV nodal rhythm
2. Low atrial nodal rhythm
3. Wolf-Parkinson-White Syndrome (WPW Syndrome)
4. Lown-Ganong-Levine (LGL)
5. Hypertension
6. Normal variant

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This page was written by Scott Moses, MD, and was last revised 1/13/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 5.0.