What is an r-r interval on a holter monitor results?

R-r interval. An ECG has various titled waves. The r wave is part of ventricular depolarization. The r to r interval is the time between ventricular depolarizations. This is usually transposable to heart rate. The holter is a 24 hour ECG recording. An r-r interval of 1second equates to a heart rate of 60 beats per minute.