At a median follow-up of 2 years , occurrence of the pre-specified composite of death , heart failure admission , reinfarction , and malignant arrhythmias was 10.8 % in the IV metoprolol group versus 18.3 % in the control group , adjusted hazard ratio ( HR ) : 0.55 ; 95 % CI : 0.26 to 1.04 ; p = 0.065 .