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Heart Rate Calculation Formula:
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Heart rate calculation using ECG involves measuring the distance between R waves on an electrocardiogram and converting this measurement to beats per minute. The large box method is a quick and simple way to estimate heart rate from ECG tracings.
The calculator uses the formula:
Where:
Explanation: Each large box on standard ECG paper represents 0.2 seconds. The formula calculates heart rate by dividing 300 (the number of large boxes in one minute) by the number of large boxes between consecutive R waves.
Details: Accurate heart rate calculation from ECG is essential for diagnosing various cardiac conditions, monitoring patient status, and guiding treatment decisions in clinical practice.
Tips: Count the number of large boxes between two consecutive R waves on the ECG tracing and enter this value. The value must be greater than zero for accurate calculation.
Q1: What is a large box on ECG paper?
A: On standard ECG paper, a large box measures 5mm x 5mm and represents 0.2 seconds at the standard speed of 25mm/s.
Q2: What is the normal heart rate range?
A: Normal resting heart rate for adults ranges from 60-100 beats per minute. Rates below 60 bpm are considered bradycardia, and rates above 100 bpm are considered tachycardia.
Q3: How accurate is this method?
A: The large box method provides a quick estimate but may not be as precise as digital ECG analysis. It's most accurate for regular rhythms.
Q4: Can this method be used for irregular rhythms?
A: For irregular rhythms, it's better to average several R-R intervals or use the 6-second method for more accurate results.
Q5: What are the limitations of this calculation?
A: This method assumes standard ECG paper speed (25mm/s) and may be less accurate for very fast or very slow heart rates.