Acute liver failure
The demographics of acute liver failure are difficult to define, as different etiologies (viral, pregnancy-induced, septic shock, drug-induced) are seen in widely different ages and subsets of the population.
Management is largely supportive: repletion of blood product and clotting factors to temporize against bleeding, lactulose and rifaximin for hepatic encephalopathy, hemodynamic stabilization, and antibiotics if there is a suspected underlying infection. Ultimately, the liver will either regenerate and restore synthetic function or liver failure will progress, resulting in death or the need for transplantation. There will be recovery from acute liver failure in approximately 40% of patients, with the remaining 60% either deceased or recipients of a liver transplant.
In pregnant patients presenting with acute liver failure, acute fatty liver of pregnancy and HELLP syndrome (hemolysis, elevated liver function tests, low platelets) should be considered as etiologies. Acute fatty liver of pregnancy is rare, occurring in approximately 1/20 000 deliveries, and presents with abdominal pain, nausea and emesis, and jaundice. Women with multiple gestations and low body mass index are at higher risk of developing acute fatty liver of pregnancy. The diagnosis is primarily clinical, distinguished from HELLP syndrome due to the absence of hemolysis and more evidence of synthetic liver dysfunction (elevated international normalization ratio [INR], elevated bilirubin), although a liver biopsy can be confirmatory by demonstrating microvesicular fatty infiltration in the hepatocytes. Treatment requires supportive care and prompt delivery of the baby.
K72.00 – Acute and subacute hepatic failure without coma
197270009 – Acute hepatic failure
Below is a list of the most common etiologies of acute liver failure. Certain etiologies have specific interventions (eg, acetaminophen overdose, portal vein thrombosis), while others (most) require just supportive care.
Common etiologies to consider:
- Acute viral hepatitis (hepatitis A and B, rarely hepatitis C, D, and E, cytomegalovirus, Epstein-Barr virus, parvovirus B19)
- Drug exposure / overdose – acetaminophen most common in the United States
- Fulminant hepatitis from hypotension / septic shock
- Portal vein thrombosis or hepatic vein thrombosis (Budd-Chiari syndrome)
- Acute fatty liver of pregnancy
- Wilson disease (rare to present as acute liver failure)
- Hemophagocytic lymphohistiocytosis
- Tumor infiltration (primary liver or metastases)
- Autoimmune hepatitis (rarely acute hepatitis)