![]() ■ QTc Interval by Bazett’s method = 0.460 sec OR 460 msec Example calculationįor a heart rate/ Pulse of 72 beats per minute and a QT interval of 0.42 seconds the result is: Please remember that this QTc calculator should NOT be considered as a substitute for any medical professional service. No gender specific, any QTc greater than 500 milliseconds is considered highly abnormal, while any value of QTc smaller than 340 milliseconds may indicate short QT syndrome. Moreover it returns the QT corrected interval expressed in both seconds and milliseconds.Īs agreed upon by ACC / HRS the normal QTc interval is below 450 milliseconds for men and below 460 milliseconds for women. ■ by Hodges’s formula: QTc = QT + 1.75(HR - 60) ■ by Framingham’s formula: QTc = QT + 0.154(1-RR) ■ by Fridericia’s formula: QTc = QT/(RR^0.33) ■ by Bazett’s formula: QTc = QT/√(RR in seconds) This QTc calculator is designed to show the QT corrected interval for heart rate extremes because it returns the estimations by 4 different equations as presented below: The QT values can be obtained from the ECG test. This is a handy health tool that can estimate the QT corrected interval by using the heart rate expressed in beats per minute and QT interval expressed either in seconds or milliseconds.
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