Mintu P. Turakhia et al. JACEP 2016;2:426-433 Deactivation-Free Survival With Competing Risk of Mortality Survival free of left ventricular lead deactivation with a competing risk of all-cause mortality (lines) is shown with 95% CI (shaded area). Use of the quadripolar system was associated with a lower risk of deactivation of left ventricular pacing compared to the bipolar system. Abbreviations as in Figure 2. Mintu P. Turakhia et al. JACEP 2016;2:426-433 American College of Cardiology Foundation