Calculating Heart Rate from Ecg Strip

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ECG Heart Rate Calculator

This calculator helps you estimate heart rate from an electrocardiogram (ECG) strip. Understanding your heart rate is crucial for assessing cardiovascular health and detecting potential arrhythmias.

Your estimated heart rate will appear here.

Understanding Heart Rate Calculation from ECG

An electrocardiogram (ECG or EKG) is a test that records the electrical activity of the heart. Each QRS complex on the ECG represents a ventricular depolarization, which is usually followed by a palpable pulse. The time between two consecutive R waves (R-R interval) is a good indicator of the heart's rhythm and rate.

How it works:

  • The heart rate is typically measured in beats per minute (bpm).
  • A standard minute has 60 seconds.
  • If you know the R-R interval (the time between two successive R waves) in seconds, you can calculate the heart rate using the formula:
    Heart Rate (bpm) = 60 / R-R Interval (seconds)
  • For example, if the R-R interval is 0.8 seconds, the heart rate is 60 / 0.8 = 75 bpm.
  • If the R-R interval is 0.6 seconds, the heart rate is 60 / 0.6 = 100 bpm.

Important Considerations:

  • This method provides an estimation. For precise readings, always refer to professional medical interpretation.
  • This calculation is most accurate for regular rhythms. Irregular rhythms may require different calculation methods (e.g., counting QRS complexes over a longer period).
  • The standard paper speed for ECGs is 25 mm/sec. This means each large box (5 mm) represents 0.20 seconds, and each small box (1 mm) represents 0.04 seconds. You can also measure the number of small boxes between R waves and use the formula: Heart Rate (bpm) = 1500 / Number of Small Boxes between R-R.
function calculateHeartRate() { var rrIntervalInput = document.getElementById("rrInterval"); var resultDiv = document.getElementById("result"); var rrInterval = parseFloat(rrIntervalInput.value); if (isNaN(rrInterval) || rrInterval <= 0) { resultDiv.innerHTML = "Please enter a valid R-R interval greater than zero."; return; } var heartRate = 60 / rrInterval; resultDiv.innerHTML = "Estimated Heart Rate: " + heartRate.toFixed(2) + " bpm"; }

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