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A short PR interval can be seen when the AV node delay is bypassed, such as in Wolff-Parkinson-White syndrome or Lown-Ganong-Levine syndrome.
Genetics in Medicine - Correction of a short cardiac PR interval in a 12-year-old girl with late-onset Pompe disease following enzyme replacement therapy ...
The normal PR interval measures 0.12-0.20 seconds (120-200 milliseconds). A prolonged or shortened PR interval can indicate certain disease. When prolonged, a first degree AV block is present.