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The normal PR interval is from 0.12-0.2 seconds and is measured on the EKG from the beginning of the P wave to the beginning of the QRS complex. This interval represents the onset of atrial depolarization to the onset of ventricular depolarization and consists of:
Such a prolonged PR interval is generally seen in healthy adults, middle-aged and older, with the incidence increasing with age. Analysis of EKGs of 7,500 participants in the Framingham Heart Study found a prolonged PR interval in 124 of them, and the increased risk was detected in a long-term follow-up.