The rate of Killip (II, III, IV) in frail group was higher than that in non frail group (36.36% vs 20%, p=0.001); complications in frail group including heart failure (61.48% vs 44.94%, p=0, 008), arrhythmias (49.35% vs 27.06%, p<0.001), hospital-acquired pneumonia (35.71% vs 14.12%, p<0.001) were higher than those in non frail patient.