1. What is the RR Interval?

The RR interval is the time between successive R waves of the QRS complex on the electrocardiogram (ECG). It represents the time between heartbeats and is inversely related to heart rate.

2. How Does the Calculator Work?

The calculator uses the RR interval formula:

Where:

• \( RR \) — RR interval in seconds
• \( HR \) — Heart rate in beats per minute (bpm)

Explanation: Since there are 60 seconds in a minute, dividing 60 by the heart rate gives the interval between beats in seconds.

3. Importance of RR Interval

Details: The RR interval is fundamental in ECG analysis, used to determine heart rate variability, diagnose arrhythmias, and assess autonomic nervous system function.

4. Using the Calculator

Tips: Enter heart rate in beats per minute (bpm). The value must be valid (HR > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is a normal RR interval?
A: For a heart rate of 60 bpm, RR is 1.0 second. At 75 bpm, RR is 0.8 seconds. Normal varies with heart rate.

Q2: How is RR interval related to heart rate?
A: They are inversely related - as heart rate increases, RR interval decreases, and vice versa.

Q3: Why measure RR interval?
A: It's essential for analyzing heart rhythm, detecting arrhythmias, and assessing heart rate variability.

Q4: What affects RR interval?
A: Respiration, autonomic nervous system activity, medications, and cardiac conditions can all affect RR intervals.

Q5: Can RR intervals vary?
A: Yes, normal variation with respiration (sinus arrhythmia) is healthy. Excessive variation may indicate pathology.