Acute on chronic disease
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Acute-on-Chronic Disease: Definition and Key Features
Acute-on-chronic disease describes a situation where a person with a long-standing (chronic) illness suddenly experiences a rapid worsening (acute event) of their condition. This is well illustrated in acute-on-chronic liver failure (ACLF), where patients with chronic liver disease, such as cirrhosis, develop sudden organ failures and have a high risk of death within a short period, often 28 days Arroyo2015Br2023Arroyo2020+1 MORE. The acute event can be triggered by infections, active alcoholism, or a relapse of hepatitis, but in many cases, no clear cause is found Arroyo2015Hernaez2017.
Pathophysiology: Systemic Inflammation and Organ Failure
A central feature of acute-on-chronic disease, especially in ACLF, is an excessive systemic inflammatory response. This inflammation can be triggered by infections or acute liver injury, leading to a "cytokine storm" that causes organ dysfunction and failure, including the liver, kidneys, brain, and other systems Arroyo2015Br2023Arroyo2020+2 MORE. The severity of inflammation is closely linked to the number of organ failures and the risk of death Arroyo2015Br2023Florent2024. In ACLF, increased gut permeability allows harmful substances to enter the bloodstream, further fueling inflammation and immune system problems Br2023Florent2024.
Triggers and Risk Factors
Common triggers for acute-on-chronic events include bacterial infections, active alcohol use, and viral hepatitis reactivation, but up to half of cases have no identifiable trigger Arroyo2015Hernaez2017. Chronic conditions like metabolic dysfunction-associated fatty liver disease (MAFLD) and alcohol-related liver disease are increasingly recognized as underlying causes, especially as the prevalence of these conditions rises globally Choudhury2024Hernaez2017. In kidney disease, chronic kidney disease increases the risk for acute kidney injury, and vice versa, showing a similar interconnected pattern .
Diagnosis and Prognosis: Scoring Systems and Uncertainty
Diagnosing acute-on-chronic disease can be challenging due to overlapping symptoms and the spectrum of disease severity, especially in chronic illnesses where diagnostic uncertainty is common . For ACLF, specific scoring systems such as the CLIF-C ACLF, MELD, and AARC scores help predict mortality and guide treatment decisions Arroyo2015Br2023Hernaez2017. These tools are important for identifying patients who may benefit from aggressive treatments like liver transplantation.
Management Strategies
Treatment of acute-on-chronic disease focuses on managing the acute trigger (if identified), supporting failing organs, and considering advanced therapies such as transplantation in eligible patients Arroyo2015Br2023Arroyo2020+1 MORE. Early detection and intervention, especially within the first week ("Golden Window"), can improve outcomes . For those not eligible for transplant, emerging therapies like fecal microbial transplant and plasma exchange are being explored, though more research is needed Br2023Hernaez2017. Supportive care in intensive or enhanced care units is often required Arroyo2015Hernaez2017.
Broader Implications: Inflammation and Disease Progression
The relationship between acute and chronic inflammation is complex. Ineffective acute inflammatory responses may contribute to the development or worsening of chronic inflammation, and vice versa Mahesh2022Gauldie2020. In both liver and kidney diseases, acute events can accelerate the progression of chronic disease, and chronic disease increases vulnerability to acute episodes .
Conclusion
Acute-on-chronic disease represents a critical intersection where chronic illness suddenly worsens, often with life-threatening consequences. Systemic inflammation and organ failure are central features, and early recognition, risk assessment, and targeted management are essential for improving survival. As chronic diseases become more common, understanding and addressing acute-on-chronic events will be increasingly important in clinical care Arroyo2015Br2023Arroyo2020+4 MORE.
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Most relevant research papers on this topic
Acute-on-chronic liver failure: A new syndrome that will re-classify cirrhosis.
Acute-on-chronic liver failure (ACLF) is a new syndrome with poor survival rates and occurs in young patients with cirrhosis, often due to systemic inflammation and alcoholic-related liver diseases.
Acute-on-chronic liver failure in metabolic dysfunction-associated fatty liver disease patients: a disease multiplier
Metabolic dysfunction-associated fatty liver disease (MAFLD) can complicate the clinical course of acute-on-chronic liver failure, with ethanol being the dominant cause in developing countries.
Immunopathogenesis of acute on chronic liver failure.
Acute-on-chronic liver failure is a high-mortality syndrome involving systemic inflammation and organ failure, with a need for new therapies and improved research and treatment paradigms.
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