1. What is RR Interval?

The RR interval is the time between successive R waves on an ECG, representing the duration between heartbeats. It's inversely related to heart rate and is used to assess heart rhythm and variability.

2. How Does the Calculator Work?

The calculator uses the simple equation:

Where:

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

Explanation: Since heart rate is beats per minute, dividing 60 seconds by the heart rate gives the interval between beats in seconds.

3. Importance of RR Interval

Details: RR interval measurement is essential for analyzing heart rhythm, detecting arrhythmias, and assessing heart rate variability which is an indicator of autonomic nervous system function.

4. Using the Calculator

Tips: Enter heart rate in beats per minute (bpm). Valid range is typically 20-250 bpm for meaningful results.

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 it's 0.8 seconds. Normal varies with heart rate.

Q2: How is RR interval used in ECG analysis?
A: Regularity of RR intervals helps identify arrhythmias. Variation in RR intervals (HRV) provides information about autonomic tone.

Q3: What affects RR interval?
A: RR interval changes with heart rate, autonomic nervous system activity, medications, and cardiac conditions.

Q4: What's the relationship between RR interval and heart rate?
A: They are inversely related - as heart rate increases, RR interval decreases, and vice versa.

Q5: Can this calculator be used for irregular heart rhythms?
A: This calculates average RR interval. For irregular rhythms like atrial fibrillation, actual RR intervals vary beat-to-beat.