Causes of Acute Liver Failure

The liver failure causes can be classified into several major categories:

Viral Hepatitis:

Hepatitis viruses, including Hepatitis A (HAV), Hepatitis B (HBV), and Hepatitis C (HCV), can lead to liver inflammation and eventual failure. Hepatitis E and the Epstein-Barr virus can also contribute to ALF in some cases.

Toxins and Drug-Induced Liver Injury:

Paracetamol overdose: Excessive intake of paracetamol, either accidentally or intentionally, is one of the leading causes of acute liver failure. Even regular high doses can be harmful over time.

Alcohol: Acute alcohol intoxication or chronic excessive drinking can result in liver damage and failure.

Other medications: Certain prescription drugs, over-the-counter medications, and herbal supplements are hepatotoxic. Antibiotics, NSAIDs, and some herbal remedies have been linked to liver toxicity.

Metabolic Disorders:

Wilson's disease: A rare genetic disorder that causes copper to accumulate in the liver, leading to toxicity and potential liver failure.

Haemochromatosis: Excess iron buildup in the liver can result in severe liver damage.

Autoimmune hepatitis:

The immune system may mistakenly attack liver cells, causing chronic inflammation and leading to ALF if left untreated.

Ischaemic hepatitis (Shock Liver):

A sudden reduction in blood flow to the liver, often due to heart failure, severe infections, or shock, can cause significant liver injury.

Pregnancy-related conditions:

Acute Fatty Liver of Pregnancy (AFLP): A rare but serious condition in the later stages of pregnancy that can lead to liver failure.

HELLP Syndrome: Characterised by haemolysis (destruction of red blood cells), elevated liver enzymes, and low platelet count, HELLP syndrome is a severe pregnancy complication.

Stages of Liver Failure

Chronic liver failure is widely recognised by medical experts as the final phase of chronic liver disease. It marks the culmination of a progressive and often irreversible decline in liver function. Chronic liver disease evolves through a series of overlapping stages, each characterised by distinct changes in the liver’s structure and function. Let’s explore each stage:

Stage 1: Hepatitis

The first stage, hepatitis, refers to inflammation of the liver. This inflammation can be triggered by various factors, including viral infections (such as hepatitis B or C), excessive alcohol consumption, autoimmune conditions, or metabolic disorders. In the early stages, hepatitis is the body’s attempt to heal damaged liver tissue.

However, when inflammation becomes chronic, it sets the stage for long-term harm. Persistent inflammation disrupts the liver’s normal architecture and initiates a cascade of events that lead to tissue scarring, known as fibrosis. Over time, this ongoing damage overwhelms the liver’s ability to repair itself, laying the foundation for further complications.

Stage 2: Fibrosis

The next stage, fibrosis, occurs when chronic inflammation leads to the accumulation of scar tissue in the liver. This scarring is the liver’s response to repeated injury, as it attempts to isolate and repair damaged areas. Fibrosis is a progressive condition, meaning it worsens over time if the underlying cause of inflammation is not addressed. Initially, thin bands of fibrous tissue form, gradually stiffening the liver and impairing its function.

However, fibrosis is not entirely irreversible in its early stages. If the source of inflammation is eliminated, for example, through antiviral treatment for hepatitis or lifestyle changes to reduce alcohol intake, the liver has a remarkable capacity to regenerate and heal. This highlights the importance of early intervention to prevent further progression.

Stage 3: Cirrhosis

As fibrosis advances, it can lead to cirrhosis, a more severe and irreversible form of liver damage. Cirrhosis is characterised by extensive scarring that disrupts the liver’s normal structure and function. At this stage, the liver’s regenerative abilities are significantly compromised because there is insufficient healthy tissue to support recovery. While cirrhosis is permanent, its progression can often be slowed or halted with appropriate medical management.

For example, controlling underlying conditions like hepatitis, avoiding alcohol, and maintaining a healthy lifestyle can help preserve remaining liver function. However, if left unmanaged, cirrhosis can lead to life-threatening complications, such as portal hypertension (increased blood pressure in the liver’s blood vessels), ascites (fluid buildup in the abdomen), and hepatic encephalopathy (brain dysfunction due to liver failure).

Stage 4: Liver failure

The final stage, chronic liver failure, occurs when the liver’s ability to perform its essential functions such as detoxifying the blood, producing proteins, and regulating metabolism, becomes severely impaired. This stage is marked by the gradual decline of liver function over months or years, rather than the sudden onset seen in acute liver failure.

As the liver fails, complications arise throughout the body, including jaundice (yellowing of the skin and eyes), coagulopathy (impaired blood clotting), and multi-organ dysfunction. Chronic liver failure is ultimately fatal without intervention, and the only definitive treatment is a liver transplant. However, not all patients are eligible for transplantation, and the availability of donor organs remains a significant challenge.