Both efficacy endpoints were met with minimal differences in the proportion of MRI and control patients who demonstrated a0 .5 V increase in ventricular pacing capture threshold ( 100 % MRI vs. 98.8 % control , noninferiority p < 0.0001 ) or a50 % decrease in R-wave amplitude ( 99.3 % MRI vs. 98.8 % control , noninferiority p = 0.0001 ) .