What is Dengue And Liver Dysfunction?

One of the significant causes of fever in India is dengue, also known as "break-bone fever." Aedes aegypti mosquitoes typically spread the dengue disease. Most infected people experience asymptomatic symptoms or an undifferentiated viral fever-like illness due to dengue virus infection. However, in a small number of individuals, it may manifest as a severe condition, such as dengue hemorrhagic fever, that results in dengue shock syndrome.

The geographic expansion of this disease is fuelled by several causes, including unrelenting urbanization, poor sanitation, crumbling health systems, and rising international travel, which greatly raises the disease burden in tropical regions.

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Complications

A well-known consequence of dengue is liver dysfunction. Acute dengue infection involves varying degrees of liver involvement, likely due to:

Direct hepatocyte apoptosis caused by the virus
Hypoxia from decreased hepatic perfusion due to fluid leakage
Oxidative stress and immune-mediated damage

The pathophysiology of dengue includes:

Direct viral injury
Dysregulated immune response
Hypoxic/ischemic injury
Potential secondary effects from medications like PCM, commonly used to treat dengue symptoms

Prognosis and Mortality:

Adults generally have a slightly better prognosis than children, whose survival rate is 50%-66%.
Mortality rates in dengue-related acute liver failure (ALF) are comparable to other forms of ALF.

Acute liver failure caused by dengue is associated with a significant mortality rate because of side effects such as

Encephalopathy
Severe bleeding
Renal failure
Metabolic acidosis
Progression to chronic liver disease, contributing to acute and chronic liver failure

Along with supporting interventions, specific measures have been successfully attempted in managing patients with dengue and ALF.

N-acetyl cysteine (NAC) has been documented as effective in several case studies.
Molecular Adsorbent Recirculating System (MARS) has been used in managing ALF related to dengue.

Due to organ damage, hemorrhage, and hemodynamic compromise brought on by dengue infection, liver transplantation becomes a challenging prospect.

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How to diagnose dengue fever?

Dengue fever is diagnosed through clinical evaluation and laboratory tests, including a Dengue NS1 antigen test and serological tests for IgM and IgG antibodies. Additionally, a Dengue Liver Function Test (LFT) can help assess liver involvement and monitor the severity of the disease.

Frequently Asked Questions

The Dengue virus can directly affect the liver, leading to liver dysfunction. This can manifest as elevated liver enzymes (ALT and AST), jaundice (yellowing of the skin and eyes), and, in severe cases, liver failure.

Symptoms may include abdominal pain, nausea, vomiting, dark urine, jaundice, and, in severe cases, bleeding tendencies due to impaired clotting factors production.

Anyone infected with the Dengue virus can develop severe Dengue, but those at higher risk include children, older adults, and individuals with weakened immune systems.

Diagnosis involves blood tests to monitor liver enzymes (ALT, AST), bilirubin levels, and clotting factors. Imaging studies like ultrasound may also be used to assess liver damage.

In most cases, liver dysfunction resolves as the Dengue infection clears. However, severe cases can lead to complications such as acute liver failure, which may require ongoing medical management.

Yes, several countries have approved Dengue vaccines. Vaccination can help prevent Dengue infection, including severe cases that may lead to liver dysfunction.