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How to calculate qtc manually4/4/2023 ![]() ![]() 10– 16 The Bazett method, which multiplies the measured QT interval by the inverse square root of the RR interval, 10 is most commonly used to derive the corrected QT interval in clinical practice. Multiple correction formulas have been empirically developed in an attempt to provide a standard index for the duration of myocardial repolarization. Assessment of the QT interval, therefore, requires correction for the heart rate in order to enable comparisons with standard, reference values. ![]() This response ensures that the myocardium remains completely excitable and avoids zones of heterogeneous conduction that could result in the induction of re-entrant arrhythmias. In addition, repolarization is also a function of the underlying heart rate and decreases with a progressive rise in the ventricular rate. ![]() 1– 9 The repolarization time reflects the electrophysiologic properties of ion channels that are responsible for maintaining equilibrium in myocardial cells. Prolongation of the QT interval reflects abnormalities in cardiac repolarization and is a risk marker for ventricular arrhythmias, other adverse cardiovascular events including heart failure (HF) and coronary artery disease (CAD), and death in various populations. ![]()
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