Acute-on-Chronic Liver Failure Definitions and Criteria

Core Conceptual Differences

The Asian Pacific Association for the Study of the Liver (APASL) defines Acute-on-Chronic Liver Failure (ACLF) as an early-stage disease characterized by acute liver dysfunction triggered primarily by intrahepatic precipitants, while the European Association for the Study of the Liver (EASL) defines it as a more advanced condition with both hepatic and extrahepatic organ failures 1, 2
APASL criteria are more sensitive but less specific, identifying patients at an earlier stage with lower 28-day mortality, while EASL criteria identify patients at intermediate to late stages with higher mortality 3, 4
APASL focuses primarily on liver failure parameters, while EASL incorporates a multi-organ failure assessment system 1, 5

The APASL definition applies to both patients with cirrhosis without prior decompensation and those with non-cirrhotic chronic liver disease 1, 2
The EASL definition applies only to patients with cirrhosis, including those with previous decompensation 1, 2

The EASL uses the CLIF-SOFA scoring system to evaluate six major organ systems: liver (bilirubin), coagulation (INR), brain (encephalopathy), kidney (creatinine), circulation (blood pressure/vasopressors), and respiration (PaO2/FiO2 ratio) 1, 5
The EASL grades ACLF severity based on the number of organ failures (ACLF-1, ACLF-2, ACLF-3), which directly correlates with mortality risk 1, 5

The EASL criteria identify patients with more severe disease requiring intensive care management and potential organ support 1, 2
The APASL criteria may identify patients earlier in their disease course, potentially allowing for more preventive interventions 3, 4
The American Association for the Study of Liver Diseases (AASLD) acknowledges these differences and suggests that any definition of ACLF should include both hepatic dysfunction and extrahepatic organ failure 3, 4