B17.2 Acute hepatitis E

Name of the Condition

• Acute hepatitis E

Summary

Acute hepatitis E is an acute inflammation of the liver caused by the hepatitis E virus (HEV). This condition typically presents with mild to moderate symptoms and may resolve spontaneously, though it can progress to severe disease in certain populations. The acute phase is characterized by liver injury resulting from the viral infection, which may be asymptomatic or cause nonspecific symptoms.

Causes

Acute hepatitis E is caused by infection with the hepatitis E virus (HEV), a non-enveloped RNA virus. Transmission occurs primarily through the fecal-oral route, often via contaminated water or food. The virus targets liver cells, leading to inflammation and potential liver damage during the acute phase.

Risk Factors

• Consumption of contaminated water or food, particularly in areas with poor sanitation.
• Travel to regions with endemic HEV.
• Immunocompromised states (e.g., organ transplant recipients, HIV-positive individuals).
• Pregnancy, especially in the third trimester.
• Contact with infected animals (e.g., pigs, deer) or their products.

Symptoms

• Fatigue and malaise.
• Jaundice (yellowing of the skin and eyes).
• Abdominal pain, particularly in the upper right quadrant.
• Nausea and vomiting.
• Loss of appetite.
• Dark urine or pale stools.

Diagnosis

Diagnosis of acute hepatitis E involves clinical evaluation and laboratory testing. Serum tests detect HEV antibodies (IgM and IgG) or viral RNA to confirm active infection. Liver function tests (LFTs) assess liver injury, and imaging (e.g., ultrasound) may rule out other causes of liver dysfunction. A detailed patient history, including travel or exposure risks, supports diagnosis.

Treatment Options

Treatment for acute hepatitis E is primarily supportive, focusing on rest, hydration, and symptom management. Antiviral therapy (e.g., ribavirin) may be considered for severe cases or immunocompromised patients. Monitoring liver function is essential, and alcohol should be avoided to prevent further liver stress.

Prognosis and Follow-Up

Most individuals with acute hepatitis E recover fully within weeks to months. Prognosis is generally favorable, but severe outcomes (e.g., fulminant hepatitis) can occur, especially in pregnant women or immunocompromised patients. Follow-up includes monitoring LFTs until normalization and assessing for chronic infection in high-risk groups.

Complications

• Fulminant hepatitis (rare but life-threatening).
• Chronic hepatitis E in immunocompromised individuals.
• Increased risk of liver failure in pregnant women.
• Potential for relapse in some cases.

Lifestyle & Prevention

• Avoid consuming untreated water or undercooked meat (e.g., pork, game).
• Practice good hand hygiene, especially after using the restroom or handling food.
• Ensure food is cooked thoroughly, particularly in endemic regions.
• Avoid sharing personal items that may contact bodily fluids.
• Vaccination is available in some countries for high-risk populations.

When to Seek Professional Help

Seek medical attention if you experience persistent jaundice, severe abdominal pain, confusion, or signs of liver failure (e.g., bleeding, ascites). Pregnant individuals or those with weakened immune systems should consult a healthcare provider promptly if exposed to HEV.

Tips for Medical Coders

Document the clinical confirmation of acute hepatitis E, including laboratory results (e.g., positive HEV IgM) and symptom onset. Ensure the code B17.2 is used for acute cases; chronic hepatitis E (if applicable) is coded separately. Note any risk factors (e.g., pregnancy, immunocompromise) or complications to support accurate coding.