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.
Walnut is a city in Los Angeles County, California, United States. The population was 29,172 at the 2010 census and its current mayor is Tom King, a former Detective from the Los Angeles Police Department. The city of Walnut obtained its name from the Rancho Los Nogales Mexican land grant, nogales being the Spanish word for walnut. With exceptions to some busy intersections (such as near Mt. San Antonio College), the hilly and affluent city is considerably more relaxed in comparison to most nearby neighborhoods. The city covers nearly nine square miles (23 km2) and is home to more than 29,000 people and 600 businesses. Money's Best Places to Live 2009 ranked Walnut as #70 in America, the highest ranking for a Californian city.