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In cardiology, the QT interval is a measure of the time between the start of the Q wave and the end of the T wave in the heart's electrical cycle. The QT interval represents electrical depolarization and repolarization of the ventricles. A lengthened QT interval is a marker for the potential of ventricular tachyarrhythmias like torsades de pointes and a risk factor for sudden death.
In particular, the QT varies with the heart rate. It shortens as the rate increases and lengthens as the rate decreases. Therefore, there is a range of normal or healthy QT intervals. In contrast, the long QT heart often recharges sluggishly or inefficiently as evidenced by a prolonged QT interval on the ECG.he QTc is the value that doctors generally use when assessing for LQTS. In this diagram, since the heart rate (RR) is the same for both examples but the QT interval is longer in the lower panel, the QTc is longer in the lower panel example.