Reinfarction was a powerful independent predictor of subsequent cardiac mortality ( hazard ratio [ 95 % confidence interval ] = 7.65 [ 4.47-13 .09 ] ; P < 0.0001 ) and all-cause mortality ( hazard ratio [ 95 % confidence interval ] = 2.88 [ 1.74-4 .78 ] ; P < 0.0001 ) .