According to the Istanbul consensus, how is acute‑on‑chronic liver failure defined and what are the first‑line management steps?

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Last updated: November 5, 2026 • View editorial policy

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ACLF Istanbul Consensus

I need to clarify an important point: There is no "Istanbul consensus" on ACLF in the medical literature. The question appears to reference a non-existent consensus document.

Existing ACLF Definitions

The current landscape includes three major regional definitions of ACLF, each identifying different patient populations 1:

EASL-CLIF Consortium Definition (European)

ACLF is defined as a severe form of acutely decompensated cirrhosis characterized by failure of one or more of six organ systems (liver, kidney, brain, coagulation, circulation, respiration) with ≥20% 28-day mortality 2.

Key diagnostic features:

  • Applies to patients with cirrhosis and acute decompensation
  • Recognizes both intrahepatic and extrahepatic precipitants (infections, GI bleeding, surgery, alcohol-associated hepatitis)
  • Grades ACLF 1-3 based on number and type of organ failures
  • Driven by excessive systemic inflammation 2

APASL Definition (Asia-Pacific)

  • Restricted to acute intrahepatic precipitants only
  • Applies to cirrhosis without prior decompensation AND non-cirrhotic chronic liver disease
  • Does NOT consider bacterial infection, GI bleeding, or surgery as precipitants 2

NACSELD Definition (North American)

  • Captures only the most severe patients receiving organ support
  • Does NOT consider severity of liver dysfunction or coagulopathy 2

Critical Differences Between Definitions

The EASL-CLIF definition is the most widely validated internationally and operational across multiple continents 2. The consensus definition proposed in 2025 significantly reduces sensitivity and under-recognizes high-risk patients compared to outcome-calibrated frameworks 3.

First-Line Management Steps (Based on EASL Guidelines)

Immediate Actions:

  1. Identify and treat precipitants aggressively:

    • Screen for bacterial infections (most common precipitant) - initiate broad-spectrum antibiotics immediately if suspected due to high prevalence of multidrug-resistant organisms 4
    • Evaluate for severe alcohol-associated hepatitis
    • Check for HBV flare, drug-induced liver injury
    • Assess for GI bleeding 2

  2. ICU triage decision:

    • ACLF grades 2-3 require ICU admission for organ support 2
    • Calculate CLIF-C ACLF score for prognostication 5

  3. Organ system support:

    • Renal: Differentiate acute tubular necrosis from hepatorenal syndrome; use vasoconstrictors (terlipressin/norepinephrine + albumin) for HRS-AKI 4
    • Circulatory: Assess hemodynamics accounting for hyperkinetic state; manage circulatory failure with vasopressors 4
    • Respiratory: Mechanical ventilation on clinical grounds 4
    • Neurological: Manage hepatic encephalopathy
    • Coagulation: Address coagulopathy as needed

  4. Urgent liver transplantation evaluation:

    • ACLF grades 2-3 should be evaluated immediately for transplantation as it remains the sole curative option 2, 1, 5
    • Transplantation offers survival benefit in carefully selected candidates 4

Futility Criteria:

After 3-7 days of full organ support, consider palliative care if:

  • ≥4 organ failures present, OR
  • CLIF-C ACLF score >70 5

Common Pitfalls

  • Confusing ACLF with simple decompensated cirrhosis: ACLF has ≥20% 28-day mortality vs. ≤5% in decompensated cirrhosis without ACLF 2
  • Delaying ICU admission: Historical reluctance to admit ACLF patients to ICU is no longer justified 4
  • Missing occult infections: Broad-spectrum antibiotics should be started on suspicion, not confirmation 4
  • Using the wrong definition: Different definitions identify fundamentally different populations with varying mortality 3

References

4
Research

Management of Acute-on-Chronic Liver Failure.

Seminars in liver disease, 2016

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