GSTM1 and congestive heart failure: ROC analysis showed ALB [area under the curve (AUC) = 0.845], Hb (AUC = 0.884), and GNRI (AUC = 0.896) as strong predictors with high sensitivity/specificity.<h4>Conclusion</h4>Reduced ALB, Hb, and GNRI levels are associated with poor CHF prognosis in elderly patients.