According to a recent prospective, observational study, acquired prolongation of the QT interval can be observed in acutely ill patients in critical care units. Which finding is MOST likely associated with QT interval prolongation?

The measure of the time between the start of the Q wave and the end of the T wave in the heart’s electrical cycle is the QT interval; the normal value is less than 500 milliseconds. Since the QT interval is affected by the heart rate, the corrected QT interval (QTc) is calculated by using any of several different formulas. The QT interval represents electrical depolarization and repolarization of the left and right ventricles. An abnormal QT interval represents abnormal repolarization of the heart.

A prolonged QT interval is a biomarker for a ventricular tachyarrhythmia like torsade de pointes and a risk factor for sudden death. Although prolonged QT interval can be inherited, acquired prolongation may...

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