Pathogenesis and transmission features
Hepatitis B virus is characterized by high heterogeneity (10 genotypes). In pediatric practice, the key factor in the development of the chronic form is vertical transmission. The risk is maximal if the mother is a carrier of HBsAg and HBeAg. Boys are three times more likely to develop chronic infection than girls. The transition from the acute to the chronic phase is often associated with genetic immune defects or an atypical course of the infection.
Clinical presentation
In young children, asthenic syndrome is usually absent. The main manifestations include:
- Hepatomegaly: increased density of the liver parenchyma (occurs in 90% of children).
- Hemorrhagic syndrome: small ecchymoses and epistaxis (in 1/3 of patients).
- Extrahepatic manifestations: systemic reactions such as glomerulonephritis, arthralgia, vasculitis, and endocrine disorders.
Important: Jaundice is not characteristic of typical chronic hepatitis B and requires the exclusion of superinfection (e.g., with hepatitis D virus).
Diagnostics and activity assessment
The gold standard for diagnostics is the serological panel and determination of viral load (HBV DNA). To assess the degree of inflammation and fibrosis, the Knodell index is used. Clinically, two main forms are distinguished:
- HBeAg-positive: high viral load, risk of rapid progression to cirrhosis.
- HBeAg-negative: moderate activity, slower course.
Principles of therapy
The goal of treatment is to suppress viral replication and achieve its elimination. Basic specific therapy includes interferon-alfa (IFN-α) preparations, which have antiviral, immunomodulatory, and antifibrotic effects. Additionally, ursodeoxycholic acid preparations are used to manage cholestasis, along with antispasmodics.
Remember the "3:1" rule: boys are affected 3 times more often than girls, hemorrhagic syndrome occurs in 1/3 of children, and the risk of chronicity with vertical transmission reaches almost 100% (95%).
Class and exam questions
Why is it important to rule out superinfection in children with chronic hepatitis B?
The appearance of jaundice is atypical for chronic hepatitis B. Its onset is a warning sign indicating coinfection or superinfection with another hepatotropic virus, such as hepatitis D.
What is the main goal of interferon therapy?
The main task is to suppress viral replication, which ideally should lead to seroconversion (disappearance of HBeAg) and a reduction in inflammatory activity in the liver.
What are "spider angiomas"?
These are telangiectasias, which are specific, pathognomonic signs of chronic liver disease.
What else to study on this topic
- Mechanisms of immunological tolerance to the virus in children.
- Comparative characteristics of short-acting and pegylated interferons.
- Differential diagnosis of chronic hepatitis B and other viral hepatitis.
- Criteria for the effectiveness of antiviral therapy at 3 and 6 months.
- The role of vaccination in reducing morbidity in the pediatric population.
Master the entire topic in the Pediatrics course
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- Complete study guide on "Chronic hepatitis B in children" and 3,738 more subject pages
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- AI tutor answers questions on the topic anytime
- 71 video lessons on the subject
Other topics in "Chapter 7. Digestive System Diseases"
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