![]() This condition that appears at any age, if left untreated leads to syncope which is fainting, feelings of dizziness and even to cardiac arrest and sudden death. It can be detected through EKG (electrocardiogram) that measures the electrical activity of the heart. This is a relatively new discovery of the 21 st century medicine and there haven’t been numerous cases documented. This is a condition that can cause arrhythmia which is a disruption in the heart’s normal rhythm because the QT interval shortening means that the heart takes less time to recharge/ relax between beats but there is no underlying structural anomaly of the heart. ■ RR Interval = 0.833 sec OR 833 msec What is the short QT syndrome? ■ QTc Interval by Hodges’s equation = 0.441 sec OR 441 msec ■ QTc Interval by Framingham’s algorithm = 0.446 sec OR 446 msec ■ QTc Interval by Fridericia’s equation = 0.446 sec OR 446 msec ■ 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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