Inter-beat (RR) Intervals. The time intervals between consecutive heart beats are customarily measured in the electrocardiogram from the beginning of a QRS complex to the beginning of the next QRS complex, so these intervals might be called QQ intervals, but they are conventionally named RR intervals.
Dubuque County, Iowa. Dubuque County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 93,653. The county seat is Dubuque. The county is named for Julien Dubuque, the first European settler of Iowa. Dubuque County comprises the Dubuque, IA Metropolitan Statistical Area, and is the seventh largest county by population in the state.
Homefacts City Report. Ollie is located in Keokuk County, IA. The population is 274, making Ollie the 9th largest city in Keokuk County. There are 0 public schools in Ollie with an average Homefacts rating of NA. The total crime rate for Ollie is very low, and there are 4 registered sex offenders residing in the city.