Predictive Value of Beat-to-Beat QT Variability Index Across the Continuum of Left Ventricular Dysfunction.

The article discusses a study which determined the predictive value of beat-to-beat QT variability index (QTVI) in heart failure patients across the continuum of left ventricular dysfunction. The study involved 533 participants and found that increased QTVI because of depressed heart rate variability predicts cardiovascular mortality and non-SCD. The study also found that QTVI does not predict SCD and extracardiac mortality in heart failure across the continuum of left ventricular dysfunction.