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Background and Aims Alcoholic liver diseases often evolve to acute-on-chronic liver failure (ACLF), which increases the risk of (multi-)organ failure and death. We investigated the development and characteristics of alcohol-related ACLF and evaluated prognostic scores for prediction of mortality in Asian patients with active alcoholism. Methods A total of 205 patients who were hospitalized with severe alcoholic liver disease were included in this retrospective cohort study, after excluding those with serious cardiovascular diseases, malignancy, or co-existing viral hepatitis. The Chronic Liver Failure (CLIF) Consortium Organ Failure score was used in the diagnosis and grading of ACLF, and the CLIF Consortium ACLF score (CLIF-C ACLFs) was used to predict mortality. Results Patients with ACLF had higher Maddrey discriminant function, model for end-stage liver disease (MELD), and MELD-sodium scores than those without ACLF. Infections were more frequently documented in patients with ACLF (33.3% vs 53.0%; P = 0.004). Predictive factors for ACLF development were systemic inflammatory response syndrome (odds ratio [OR], 2.239; P < 0.001), serum sodium level (OR, 0.939; P = 0.029), and neutrophil count (OR, 1.000; P = 0.021). For prediction of mortality at predefined time points (28-day and 90-day) in patients with ACLF, areas under the receiver-operating characteristic were significantly greater for the CLIF-C ACLFs than for Child-Pugh, MELD, and MELD-sodium scores. Conclusions Infection and systemic inflammatory response syndrome play an important role in the development of alcohol-related ACLF in Asian patients with active alcoholism. The CLIF-C ACLFs may be more useful for predicting mortality in ACLF cases than liver-specific scoring systems. [ABSTRACT FROM AUTHOR]