Solution
PR interval is the duration from the begning of P wave and at the bigning of QRS complex in
electrocardiography which is measured in milliseconds. The Shortened PR interval is the
duration less than 120ms associated with Lown Ganong Levine Syndrome and Wolff Parkinson
White Syndrome. The normal PR interval duration is range in between 120ms to 200ms
sometimes also known as normal PQ interval.