Corrected QT Interval (QT)
The QT interval of the electrocardiogram (ECG) is measured from the onset of ventricular activity to the end of the T wave. Because the QT interval varies with heart rate in normal individuals a “corrected” QT interval is sometimes calculated to factor out heart rate-dependent effects to provide a measure that is independent of rate effects. A normal corrected QT interval should not exceed 440 msec.
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- 1.Wyngaarden JB, et al: Cecil Textbook of Medicine, ed. 17. Philadelphia, WB 1985, Saunders Co, p 173.Google Scholar