The P-R Interval. The first measurement is known as the P-R interval and is measured from the beginning of the upslope of the P wave to the beginning of the QRS wave. This measurement should be 0.12-0.20 seconds, or 3-5 small squares in duration.The second measurement is the width of the QRS which should be less than 3 small squares, or less than 0.12 seconds in duration. Image: Normal Intervals. 1  P-R interval = 0.12 - 0.20 sec (3 - 5 small squares).2  QRS width = 0.08 - 0.12 sec (2 - 3 small squares). 3  Q-T interval 0.35 - 0.43 sec. P-R interval = 0.12 - 0.20 sec (3 - 5 small squares). 2  QRS width = 0.08 - 0.12 sec (2 - 3 small squares). 3  Q-T interval 0.35 - 0.43 sec. * 4  The PR interval should really be referred to as the PQ interval; however it is commonly referred as the PR interval.
Walnut Cove is a town in Stokes County, North Carolina, United States. The population was 1,425 at the 2010 census. It is the home of the Walnut Cove Springfest which draws many visitors to the area. Festival-organizers marked 1889, the townâs incorporation date, but the townâs roots date to the mid-18th century when it was known as Town Fork.
Caldwell County is a county located in the U.S. state of North Carolina. As of the 2010 census, the population was 83,029. Its county seat is Lenoir. Caldwell County is part of the Hickory âLenoirâ Morganton, NC Metropolitan Statistical Area.