What is represented by the R-R interval in an ECG?

The R-R interval in an electrocardiogram (ECG) specifically measures the time between two successive R waves in the QRS complex. This interval is critical because it represents one complete cycle of the heart’s electrical activity, thus reflecting the time it takes for the heart to pump and refill between beats. Accurately distinguishing this time is essential for understanding heart rate; for example, by calculating the heart rate from the R-R interval, medical professionals can assess the rhythm of the heart.

The R-R interval is a reliable marker for identifying the duration of the cardiac cycle. It provides insights into various heart conditions, including arrhythmias, by allowing clinicians to analyze the regularity of heartbeats. Therefore, understanding the R-R interval is vital for interpreting the overall electrical activity of the heart effectively.