Acute liver failure (ALF) is a rare but life-threatening condition characterized by rapid loss of liver function due to severe hepatocyte ( liver cell ) injury. It is a complex and multifactorial disorder that can have various causes, including viral hepatitis, drug-induced liver injury, and metabolic disorders. The management of ALF requires a multidisciplinary approach, combining intensive supportive care and timely intervention, such as liver transplantation, to improve the outcome of patients. Here we will discuss the medical and surgical aspects of ALF, including the causes, diagnostic evaluation, management, and outcomes of this condition.

Causes of ALF

The causes of ALF can be broadly categorized into three main groups

Viral hepatitis

Viral hepatitis is the most common cause of ALF, accounting for approximately 50% of cases. The most common viral causes are hepatitis A and E. Hepatitis A and E are water borne viruses that affect a large population of people in developing countries like India

Drug-induced liver injury (DILI)

Drug-induced liver injury (DILI) is another common cause of ALF, accounting for approximately 20-25% of cases. DILI can be caused by a wide variety of medications, including antibiotics, antipsychotics, and herbal supplements. Acetaminophen / Paracetamol overdose is the most common cause of DILI-induced ALF in western countries, accounting for approximately 50% of cases.

Metabolic disorders

Metabolic disorders are less common causes of ALF, accounting for approximately 10-15% of cases. These disorders include Wilson's disease, acute fatty liver of pregnancy, and Reye's syndrome.

Diagnostic Evaluation

The diagnosis of ALF is based on a combination of clinical, laboratory, and imaging findings. The clinical presentation of ALF is characterized by the rapid onset of jaundice, coagulopathy, and encephalopathy.

Laboratory tests are essential in the evaluation of ALF. Elevated transaminase levels, specifically aspartate transaminase (AST) and alanine transaminase (ALT), are commonly found in patients with ALF. The international normalized ratio (INR) is also elevated, reflecting the coagulopathy that is commonly seen in ALF.

Imaging studies, such as ultrasound and computed tomography (CT) scan, can be used to evaluate the liver and identify any underlying causes of ALF, such as masses or cirrhosis.

Medical Management

The management of ALF is primarily supportive and aims to prevent further liver injury and manage the complications of the disease.

Intensive care unit (ICU) management is essential for patients with ALF, as they are at high risk for complications such as infections, metabolic derangements, and multiorgan failure.

Coagulopathy is a common complication of ALF and requires prompt management with blood products, such as fresh frozen plasma and platelets. The use of oral or intravenous vitamin K is also recommended to correct the coagulopathy.

Encephalopathy, a neurological complication of ALF, can occur as a result of the accumulation of toxins in the blood. Management of encephalopathy includes the use of lactulose or other non-absorbable disaccharides to promote the removal of toxins from the gut.

Liver Transplant can be life saving in ALF

Liver transplant has revolutionized the treatment of Acute Liver Failure.  A liver transplant is typically considered when the patient’s condition is life-threatening. The decision to perform a liver transplant is usually made by a multidisciplinary team that includes a hepatologist, a transplant surgeon, and a transplant coordinator.

When to transplant in ALF

The King’s College Criteria is a widely used set of guidelines for determining the eligibility of patients with acute liver failure (ALF) for liver transplantation. These criteria are intended to help identify patients with ALF who are most likely to benefit from liver transplantation.

It’s important to note that the King’s College Criteria are not the only criteria for determining suitability for liver transplantation and other criteria may also be used depending on the center policy and experience. Also, this criteria is not definitive and some patients that don’t meet the criteria may still benefit from a transplant, and the opposite is also true some patients that meet the criteria may not need a transplant.

Prognosis of ALF

The prognosis of ALF varies depending on the underlying cause, the patient’s overall health, and the severity of their condition. In some cases, patients may be able to recover with appropriate treatment and support. However, in severe cases, ALF can be fatal. The survival rate for patients with ALF who do not receive a liver transplant is less than 50%. For patients who receive a liver transplant, the survival rate is about 80%.