How does acute liver failure differ from cirrhosis?

Acute liver failure develops rapidly in a liver that was previously healthy, whereas cirrhosis is the end stage of long-standing chronic liver disease; the distinction is part of the definition and shapes prognosis and management.

Why is brain swelling such a feared complication?

In rapidly evolving acute liver failure, high ammonia and inflammation can cause the brain to swell (cerebral edema), raising intracranial pressure to dangerous levels; this is a leading cause of death in the syndrome.

Acute Liver Failure

Acute liver failure is the rapid loss of liver function — marked by coagulopathy and hepatic encephalopathy — in a person without pre-existing chronic liver disease. It is a rare but life-threatening syndrome in which the collapse of the liver's synthetic and detoxifying capacity can progress within days to multi-organ failure and dangerous brain swelling.

Găsește o temă cu PaperMindÎn curândFind papers & topics

Tools & resources

Descarcă prezentarea

Learn & explore

VideoÎn curând

Definition

Acute liver failure is the development of severe acute liver injury with coagulopathy and any degree of hepatic encephalopathy, occurring within days to weeks (commonly within 26 weeks) in a patient without previously known chronic liver disease.

Scope

The entry covers the definition of acute liver failure and its distinction from decompensated chronic disease, the main causes (notably drug-induced injury and viral hepatitis, with geographic variation), the central role of encephalopathy and coagulopathy in defining severity, and complications such as cerebral edema. It is a reference description of the syndrome and does not provide management or treatment guidance.

Core questions

How is acute liver failure defined and distinguished from chronic liver disease?
What are the leading causes, and how do they vary by region?
Why are encephalopathy and coagulopathy central to its definition and severity?
What complications, such as cerebral edema, drive its mortality?

Key concepts

Coagulopathy (elevated INR)
Hepatic encephalopathy as a defining feature
Hyperacute, acute and subacute classification
Drug-induced (acetaminophen) injury
Viral hepatitis as a cause
Cerebral edema and intracranial hypertension
Multi-organ failure
Prognostic criteria and transplantation assessment

Mechanisms

Acute liver failure follows massive injury to or loss of hepatocytes, removing the liver's synthetic and detoxifying capacity over a short period. The result is coagulopathy from failed clotting factor synthesis and hepatic encephalopathy from failed clearance of gut-derived toxins, the two features that define the syndrome (Bernal & Wendon, 2013; Stravitz & Lee, 2019). Causes differ geographically: acetaminophen overdose and idiosyncratic drug injury predominate in many high-income settings, while viral hepatitis is a major cause elsewhere (Wendon et al., 2017). In the most rapidly evolving (hyperacute) presentations, high arterial ammonia and systemic inflammation drive cerebral edema and intracranial hypertension, which can cause fatal brain herniation (Clemmesen et al., 1999), while circulatory failure and infection contribute to multi-organ dysfunction.

Clinical relevance

Acute liver failure is a medical emergency whose recognition rests on detecting coagulopathy and encephalopathy in someone without prior liver disease, and it is a leading indication for urgent liver transplantation evaluation. This entry describes the syndrome, its causes and its complications for reference and is not a basis for diagnosis, prognostication or treatment of any individual.

Epidemiology

Acute liver failure is uncommon. Its causes and outcomes vary by region: drug-induced injury, particularly acetaminophen, is a frequent cause in many high-income countries, whereas viral hepatitis figures more prominently in other parts of the world. Outcomes have improved with intensive care and emergency transplantation, but mortality remains substantial, especially in subacute presentations (Bernal & Wendon, 2013; Stravitz & Lee, 2019; Wendon et al., 2017).

Evidence & guidelines

Acute liver failure is addressed by dedicated society guidelines, including the EASL clinical practice guidelines on acute (fulminant) liver failure (Wendon et al., 2017) and AASLD practice guidance covering critically ill patients with liver failure (Karvellas et al., 2024), supported by major narrative reviews (Bernal & Wendon, 2013; Stravitz & Lee, 2019).

History

The syndrome was historically termed fulminant hepatic failure, defined by Trey and Davidson in 1970 by the onset of encephalopathy within eight weeks of illness in a previously healthy liver. Later classifications by time from jaundice to encephalopathy (hyperacute, acute, subacute) refined prognosis, and the rise of emergency liver transplantation transformed outcomes.

Debates

Which prognostic criteria best identify patients who need transplantation?: Several prognostic models, including the King's College Criteria, aim to identify patients unlikely to survive without transplantation, but their sensitivity and specificity are imperfect and continue to be debated and refined.

Seminal works

bernal-2013
stravitz-2019
wendon-2017

Frequently asked questions

How does acute liver failure differ from cirrhosis?: Acute liver failure develops rapidly in a liver that was previously healthy, whereas cirrhosis is the end stage of long-standing chronic liver disease; the distinction is part of the definition and shapes prognosis and management.
Why is brain swelling such a feared complication?: In rapidly evolving acute liver failure, high ammonia and inflammation can cause the brain to swell (cerebral edema), raising intracranial pressure to dangerous levels; this is a leading cause of death in the syndrome.