QTc Bazett Calculator
The QTc Bazett Calculator estimates the corrected QT interval based on the QT interval and heart rate. This tool helps medical professionals assess cardiac repolarization time accurately. Whether you are monitoring patients on QT-prolonging medications, screening for arrhythmia risks, or evaluating electrolyte disturbances, this calculator provides quick and reliable results to support clinical decisions.
How Corrected QT Interval Is Calculated
QTc = QT / √RR
Where:
- QTc = Corrected QT interval in milliseconds
- QT = Measured QT interval in milliseconds
- RR = Time between heartbeats in seconds
The corrected QT interval (QTc) represents the heart's electrical recharge time adjusted for heart rate. This adjustment is crucial because the raw QT interval changes naturally as the heart beats faster or slower. To calculate it, we use Bazett's formula, which is the clinical standard for identifying cardiac risks. First, measure the QT interval in milliseconds. Next, determine the RR interval from the ECG or convert heart rate to seconds. Finally, divide the QT by the square root of the RR interval to get the corrected value.
What Your Corrected QT Interval Means
Your result shows the adjusted time it takes for your heart's ventricles to recharge electrically after a beat. This number is vital for identifying patients at risk for life-threatening irregular heartbeats.
Result Interpretation
- Normal Range (Under 430ms for men, 450ms for women): This suggests a very low risk of arrhythmias. Most patients in this range do not need specific interventions regarding their QT interval.
- Borderline Range (430-450ms for men, 450-470ms for women): You should proceed with caution. Review your medication list for QT-prolonging drugs and check electrolyte levels like potassium and magnesium.
- Prolonged Range (Over 450ms for men, 470ms for women): This indicates a high risk for serious rhythm issues. Stop potential culprit medications and consult a cardiologist for further testing.
This tool is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider.
Re-check your QTc whenever you start or stop medications known to affect heart rhythm.