exercise-induced PR prolongation
Abnormal lengthening of the PR interval on ECG during or after exercise, potentially indicating conduction system abnormalities.
Full Definition
Exercise-induced PR prolongation refers to an abnormal increase in the PR interval observed on electrocardiography during exercise stress testing or post-exercise recovery. While PR interval typically shortens with increasing heart rate due to enhanced AV nodal conduction, paradoxical prolongation may indicate underlying conduction system disease, medication effects, or metabolic abnormalities. In athletes, this finding requires careful evaluation as it may suggest increased risk for higher-degree AV blocks or other conduction abnormalities during intense training or competition.
Usage
Usage note: Distinguish from expected PR shortening with exercise and from fixed first-degree AV block present at rest.
In Context
- "Exercise testing revealed progressive PR prolongation reaching 240 milliseconds at peak exertion." — Exercise stress test report
- "The runner's exercise-induced PR prolongation resolved completely during recovery." — Cardiology follow-up note