Mintu P. Turakhia et al. JACEP 2016;2:426-433 Survival From All-Cause Mortality Kaplan Meier survival (lines) from all-cause mortality is shown with 95% confidence interval (CI) (shaded area). Use of the quadripolar system was associated with a lower risk of death compared to the bipolar system. The quadripolar group was more heavily censored because these patients were implanted later in the observation period. HR = hazard ratio. Mintu P. Turakhia et al. JACEP 2016;2:426-433 American College of Cardiology Foundation