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[Hepatitis C]
1Service d'hépato-gastro-entérologie I, Centre hospitalo-universitaire La Tronche, Grenoble.
Insights
Hepatitis C virus (HCV) infection is often asymptomatic, with nonspecific symptoms and variable transaminase levels. Chronic HCV can lead to cirrhosis and hepatocellular carcinoma, underscoring the need for early detection and management.
Area of Science:
- Hepatology
- Virology
- Gastroenterology
Context:
- Hepatitis C virus (HCV) infection often presents with mild or absent symptoms, especially during the acute phase.
- Diagnosis relies on characteristic, albeit variable, transaminase fluctuations and prolonged elevation indicating chronic hepatitis C.
- The chronic stage is frequently asymptomatic, complicating early identification.
Purpose:
- To outline the clinical and laboratory presentation of Hepatitis C.
- To describe the natural history and long-term risks associated with chronic Hepatitis C virus infection.
- To highlight histological findings and prognostic factors in Hepatitis C.
Summary:
- Hepatitis C virus (HCV) infection typically has a long, asymptomatic incubation period followed by nonspecific symptoms and fluctuating transaminase levels.
- Chronic hepatitis C, indicated by elevated transaminases for over six months, is usually asymptomatic but characterized by specific histological lesions.
- The primary risks of chronic HCV are progression to cirrhosis (20-70% of cases) and hepatocellular carcinoma (HCC) (at least 20% within 10 years of cirrhosis).
Impact:
- Understanding the subtle presentation of Hepatitis C is crucial for timely diagnosis and intervention.
- Recognizing the risk factors and progression to cirrhosis and HCC aids in patient management and prognosis.
- Identifying histological markers like steatosis and bile duct involvement can inform disease staging and treatment strategies.
Abstract:
Hepatitis C is usually poorly symptomatic, particularly in the acute phase. After an incubation period ranging from 5 to 12 weeks, the symptoms are nonspecific and icterus is rarely present. Laboratory results are more suggestive, showing characteristic fluctuations in transaminases comprising periods with normal values. Chronic hepatitis is probable when elevation of transaminases persists for more than 6 months. Chronic virus C hepatitis is usually asymptomatic. Clinical manifestations are poorly specific and transaminase concentrations are generally little increased and variable in over 75% of the cases. Some histological lesions are more often observed in the chronic stage, particularly steatosis, presence of intraportal lymphoid nodules and bile duct involvement. The natural history is dominated by the risk of development to cirrhosis and hepatocellular carcinoma. A course to chronic hepatitis C is observed in 20 to 70% of cases, while the risk of developing cirrhosis is between 10 and 38% within approximately 20 years. Prognosis is then linked to decompensation of cirrhosis and especially to the development of hepatocellular carcinoma, within approximately 10 years after appearance of cirrhosis, with a prevalence of at least 20%. The association of other factors such a hepatitis B virus or alcohol can accelerate this course.