A BNP minus reduction > 27.24% at six hours after admission had an area under curve (AUC) of 0.852 (p = 0.008) or > 290 pg / ml at six hours after admission had an area under curve (AUC) of 0.901, (p = 0.02) for predicting future recovery with test sensitivity and specificity of 77.8% and 83.33%, respectively.