![]() ![]() ![]() In the heart rate section, type the number of beats per minute of your patient’s heart rate.Type the result in the QT interval field of our QTc calculator.With a paper speed of 25 mm/s, one small box (1 mm) lasts 0.04 s, and one big box (5 mm) – 0.2 s. Transform the length of the QT interval from millimeters or boxes to milliseconds.Measure the distance between these two points on X-axis.Find the beginning of the Q wave (and QRS complex at the same time).Determine the length of the QT interval:. ![]() To get your patient’s QTc with our QTc calculator, you need to: In a recent study published in the Journal of the American Heart Association, authors compared previously listed methods of QT correction and concluded that Framingham and Fridericia equations provided the best rate correction and mortality prediction. To see the QTc calculated with these formulas, click on the advanced mode button. The sex coefficient equals 6 ms for men and 0 ms for women. QTc = QT - 185 × ((60 / Heart_Rate) - 1) + sex_coefficient The Framingham correction based on the Framingham Heart Study: This method is also thought to give more consistent results at faster heart rates. Several other equations have been proposed: Bazett’s formula looks like this:Īlthough very popular, Bazett’s formula has its limitations – it is known for overcorrecting at high heart rates and undercorrecting at low heart rates. The most common equation used for QT interval correction all around the world is a formula presented by physiologist Henry Cuthbert Bazett in the article “An Analysis of the Time-Relations of Electrocardiograms,” published in 1920 in the Heart Journal. ![]()
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