1. What is RR Interval?

The RR interval is the time between two successive R waves of the QRS complex on the electrocardiogram (ECG). It represents the duration of one cardiac cycle and is used to calculate heart rate and assess heart rhythm.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• 60000 — Conversion factor (milliseconds to minutes)
• RR Interval — Time between R waves in milliseconds

Explanation: The formula converts the time between heartbeats (in milliseconds) to beats per minute (bpm).

3. Importance of RR Interval Measurement

Details: RR interval measurement is essential for determining heart rate, diagnosing arrhythmias, assessing heart rate variability, and evaluating autonomic nervous system function.

4. Using the Calculator

Tips: Enter the RR interval in milliseconds (ms) as measured from the ECG. The value must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal RR interval?
A: For a heart rate of 60 bpm, RR interval is 1000 ms. For 100 bpm, it's 600 ms. Normal varies with heart rate.

Q2: How do I measure RR interval on ECG?
A: Measure the distance between consecutive R wave peaks. Most ECG software provides automatic measurements.

Q3: What does irregular RR interval indicate?
A: Irregular intervals may indicate arrhythmias like atrial fibrillation or sinus arrhythmia.

Q4: Can this calculator detect arrhythmias?
A: No, this only calculates heart rate from a single RR interval. Arrhythmia diagnosis requires analyzing multiple cycles.

Q5: How accurate is this calculation?
A: The calculation is mathematically precise, but clinical interpretation requires considering the full ECG context.