Notes
- Regular: The distance between the consecutive R-R intervals is the same throughout the ECG strip and there are less than three small boxes (less than 0.12 sec) of variation between the shortest and longest R-R interval.
- Irregular: The R-R intervals are not spaced evenly. There may or may not be a pattern to the irregularity. There are three or more small boxes (equal to or greater than 0.12 sec) of variation between the shortest and longest R-R interval.