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The R-R interval in an ECG is significant primarily because it helps determine heart rate. Specifically, it represents the time between two successive R-wave peaks in the QRS complex of the ECG, which corresponds to one complete cardiac cycle. By measuring the R-R interval, healthcare professionals can calculate the heart rate using the formula: heart rate = 60 seconds divided by the R-R interval (in seconds).

Understanding the R-R interval is crucial in clinical practice, as variations in this interval can indicate changes in heart rhythm or the presence of arrhythmias. A consistent R-R interval suggests a stable heart rate, while variability might indicate underlying cardiac conditions that require further evaluation. This measurement is a fundamental tool in diagnosing and monitoring cardiovascular health.

While other options mention aspects related to cardiac function, they do not directly address the primary role of the R-R interval, which is key to determining heart rate.