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 two heartbeats and is used to calculate heart rate.

2. How Does the Calculator Work?

The calculator uses the simple equation:

Where:

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

Explanation: Since heart rate is typically measured in beats per minute (60 seconds), dividing 60 by the RR interval (in seconds) gives the heart rate.

3. Importance of Heart Rate Calculation

Details: Accurate heart rate calculation from ECG is essential for diagnosing arrhythmias, assessing cardiac function, and monitoring patients during procedures or exercise.

4. Using the Calculator

Tips: Enter the RR interval in seconds (typically between 0.3-1.5 seconds for normal heart rates). 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 is 1.0 second. For 100 bpm, RR is 0.6 seconds. Normal varies with heart rate.

Q2: How accurate is this calculation?
A: Very accurate when measured from a high-quality ECG. Less accurate with irregular rhythms where RR intervals vary.

Q3: Can I use average RR interval for irregular rhythms?
A: For atrial fibrillation, average several RR intervals for better heart rate estimation.

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

Q5: How does this compare to other heart rate measurement methods?
A: ECG-derived heart rate is more accurate than pulse palpation, especially with irregular rhythms.