In non-LBBB patients with a prolonged PR interval , CRT-D treatment was associated with a @ % reduction in the risk of heart failure/death ( hazard ratio , @ ; @ % confidence interval , @-@ @ ; P < @ ) and @ % decrease in the risk of all-cause mortality ( hazard ratio , @ ; @ % confidence interval , @-@ @ ; P < @ ) compared with implantable cardioverter defibrillator therapy .