Jeffrey Senfield et al. JACEP 2017;3:818-826 Time to HF Hospitalization or Death by Randomization With the PR Interval Dichotomized at 180 ms Composite endpoint for time to heart failure hospitalization or death for PR ≤180 ms and PR >180 ms. There was no statistical difference in the interaction p value between the 2 groups (p = 0.33). CRT OFF = cardiac resynchronization therapy control group; CRT ON = group actively on cardiac resynchronization therapy; HF = heart failure; HR = hazard ratio. Jeffrey Senfield et al. JACEP 2017;3:818-826 2017 American College of Cardiology Foundation