Home | | Medicine and surgery: Principles and practice of medicine and surgery | Hepatitis D - Complications of chronic liver disease

Chapter: Medicine and surgery: Hepatic, biliary and pancreatic systems

Hepatitis D - Complications of chronic liver disease

Hepatitis D virus (HDV) or delta agent is a virus that only causes hepatitis in conjunction with hepatitis B. - Definition, Incidence, Aetiology, Pathophysiology, Clinical features, Complications, Investigations, Management, Prognosis.

Hepatitis D

 

Definition

 

Hepatitis D virus (HDV) or delta agent is a virus that only causes hepatitis in conjunction with hepatitis B.

 

Aetiology/pathophysiology

Hepatitis D, a single stranded RNA virus, has a genome which does not encode for its own protein coat. It there-fore has to use proteins made by the HBV. It is therefore not pathogenic in the absence of HBV replication. Unlike HBV, it has a direct cytopathic effect, which may contribute to the clinical features. Any patient at risk of hepatitis B is at risk of hepatitis D, particularly intravenous drug users.

 

Clinical features

 

Two patterns of disease are seen:

 

When hepatitis B and D simultaneously infect the host a co-infection occurs. The resulting hepatitis is of variable severity, but is more likely to cause fulminant hepatic failure. The chronic carrier state is rare.

If hepatitis D occurs in patients carrying hepatitis B, i.e. a super-infection, it may precipitate an acute hepatitis or convert a mild chronic disease to fulminant hepatitis. HDV super-infection has a strong tendency (10–40%) towards chronic progressive disease, leading to an increased risk of rapidly developing cirrhosis and hepatocellular carcinoma.

 

Investigations

 

Finding antibodies to HDV (IgM or IgG) is diagnostic. Alternatively, a cDNA probe can be used to detect HDV in the blood, and HDAg can be detected in liver cells using immunofluoresence.

 

Management

 

There is no vaccine for hepatitis D; however, vaccination against hepatitis B will prevent hepatitis D infection. Interferon α can be used to treat patients with chronic hepatitis B who also have hepatitis D infection.

 

Prognosis

 

Recovery from hepatitis B leads to clearance of hepatitis D also. However, chronic hepatitis D infection has a poor prognosis.

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail
Medicine and surgery: Hepatic, biliary and pancreatic systems : Hepatitis D - Complications of chronic liver disease |

Related Topics

Medicine and surgery: Hepatic, biliary and pancreatic systems


Privacy Policy, Terms and Conditions, DMCA Policy and Compliant

Copyright © 2018-2023 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.