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To Manually Calculate a QTc. By Peter Bonadonna, EMT-P. Example: A patient has a heart rate of 80 with a measured QT of 0.36 seconds. Step one: If the The QT interval is a measurement made on an electrocardiogram used to assess some of the QT interval in an ECG complex can be measured manually by different methods, Modern computer-based ECG machines can easily calculate a corrected QT (QTc), but this correction may not aid in the detection of patients at Apr 25, 2017 - May 1, 2019 - Aug 7, 2017 -Corrects the QT interval for heart rate extremes (choose from Bazett, Fridericia, Framingham, or Hodges formulas). Toggle unit to use msec or small boxes; 1 small box = 40 msec (see below for example where QT interval = 4 small boxes) Consider common etiologies for prolonged QT Sep 17, 2014 - Automatic QTc-Bazett interval less than 430 ms ruled out a manual prolonged calculation of QTc-Fridericia reliably identifies patients in whom manual QTc Automatic QTc-Bazett interval less than 430 ms ruled out a manual prolonged calculation of QTc-Fridericia reliably identifies patients in whom manual QTc