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. This page was last revised before 5/10/08, prior to consistent tracking of revision date. This page was last published on 5/10/2008. 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 6.0.