Tom Bosley, the folksy father of Richie Cunningham on the '70s sitcom about the '50s, ABC's Happy Days, died Tuesday in his Palm Springs, Calif., home. On Oct. 1, he had turned 83.
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The PR interval is the time from the onset of the P wave to the start of the QRS complex. It reflects conduction through the AV node. The normal PR interval is between 120 â 200 ms duration (three to five small squares). If the PR interval is > 200 ms, first degree heart block is said to be present. PR interval < 120 ms suggests pre-excitation (the presence of an accessory pathway between the atria and ventricles) or AV nodal (junctional) rhythm.