A, Kaplan-Meier survival plot for adult congenital heart disease patients by albuminuria status, for patients with biventricular circulation; an ACR level of 30 mg/g or greater was a significant predictor of the combined outcome (hazard ratio, 4.5; 95% CI, 2.5-8.0; P < .001 by log-rank test). B, For patients with single-ventricle Fontan circulation, an ACR level of 30 mg/g or greater was not a significant predictor of the combined outcome (hazard ratio, 1.0; 95% CI, 0.4-2.8; P = .95 by log-rank test). ACR indicates albumin-to-creatinine ratio.