Hepatitis
HEPATITIS
Introduction to Hepatitis
Hepatitis refers to widespread inflammation and infection of the liver. This condition critically impairs the liver's ability to detoxify substances, limits its production of essential proteins and clotting factors, and inhibits the storage of vitamins, fats, and sugars. Viral hepatitis can present itself in both acute and chronic forms, and the primary types of viral hepatitis include:
Hepatitis A (HAV)
Hepatitis B (HBV)
Hepatitis C (HCV)
Hepatitis D (HDV)
Hepatitis E (HEV)
Transmission and Vaccination
A: Hepatitis A is transmitted via fecal-oral routes and is associated with contaminated food and water. It is typically prevented through vaccination.
Vaccine: Yes
Transmission: Fecal, Oral
B: Hepatitis B transmission occurs through body fluids, including blood, saliva, and semen. It can lead to chronic infection and is also preventable through vaccination.
Vaccine: Yes
Transmission: Blood, Semen
C: Hepatitis C is primarily transmitted through blood, such as through needle sharing. No vaccines are available for Hepatitis C.
Vaccine: No
Transmission: Blood, Semen
D: This is a superinfection that requires the presence of Hepatitis B to manifest. The transmission occurs through blood.
Vaccine: No
E: Similar to Hepatitis A, it is transmitted via fecal-oral routes.
Vaccine: No
Symptoms (SS) of Hepatitis Types
All Types: Symptoms include right upper quadrant discomfort, gastrointestinal symptoms such as nausea/vomiting, anorexia, weight loss, fever, and chills.
Treatment (TX) for All Hepatitis Types
Management of hepatitis generally includes resting, maintaining nutrition and hydration, and partaking in activity as tolerated.
Hepatitis A
Characteristics
Hepatitis A is classified as an RNA virus from the enterovirus family. It survives on hands and is primarily transferred through fecal-oral routes, whether person to person or through contaminated food or water. While it is resistant to detergents and acids, it can be killed by chlorine. Symptoms resemble flu-like illness but can be severe particularly in individuals over the age of 40 or those with pre-existing liver disease.
Laboratory Diagnosis
Serologic Markers:
anti-HAV immunoglobulin M (IgM) indicates acute infection.
IgG indicates previous infection and permanent immunity.
Liver Enzymes: Acute elevations of ALT and AST are characteristic of Hepatitis A infection.
Prevention
The Hepatitis A vaccine is recommended for infants, children, and adolescents, and some adults may need vaccination as well. Preventative measures include proper handwashing, avoiding contaminated food or water, and administering immune globulin within 14 days of exposure after potential infection.
Hepatitis B
Characteristics
Hepatitis B consists of a double-shelled particle containing DNA with the following components:
Core Antigen (HBcAg)
Surface Antigen (HBsAg)
Third Antigen (HBeAg)
Transmission typically occurs through:
Sexual intercourse
Sharing of drug equipment (needles, razors, toothbrushes)
Blood transfusions
Hemodialysis
From mother to child at birth.
The onset of symptoms occurs between 25 to 180 days, with some individuals displaying no symptoms at all. Blood tests are used for confirmation, and many clear the disease, while others may become carriers which increases the risk of cirrhosis and liver cancer.
Laboratory Findings
Serologic testing for acute infection includes:
HBsAg (positive indicates an active infection)
IgM anti-HBc (antibodies to core antigen for confirming acute infection).
If HBeAg is present for over six months, it indicates carrier state or chronic infection. The presence of anti-HBs shows recovery or previous vaccination.
Acute elevations in liver enzymes are also seen.
Examples of HBV Laboratory Values
Negative Results:
HBsAg: Negative
Total anti-HBc: Positive
Anti-HBs: Negative
Positive Results:
HBsAg: Positive
Total anti-HBc: Positive
IgM anti-HBc: Positive
Anti-HBs: Negative
(Additional combinations of positive and negative lab values can indicate various stages of infection/recovery.)
Prevention
Vaccination against Hepatitis B is crucial for children and adults, especially those at increased risk due to sexual behavior, occupation (healthcare), chronic liver disease, or immunocompromised states. Preventative measures include safe sex practices and aware educational campaigns.
Hepatitis C
Characteristics
Hepatitis C is an enveloped, single-stranded RNA virus, and it is the leading cause of end-stage liver disease. The incubation period ranges from 2 weeks to 6 months. Most individuals remain asymptomatic in the early stages, but once infected, they often fail to clear the virus, leading to chronic infection. This results in inflammation that damages the immune system and eventually causes liver scarring.
Transmission
Transmission occurs primarily through blood, including:
Needle sharing or needlestick injuries
Blood products
Hemodialysis
Sharing of illicit drugs
Though rare, some high-risk sexual behaviors can also contribute to transmission.
Laboratory Findings
Acute infections are characterized by:
Elevated liver enzymes
Detection of HCV RNA confirming the active virus and assessing viral load
Tests for anti-HCV antibodies and specific viral proteins such as NS3, NS4, and NS5 appear within 4 weeks of infection.
Vaccination and Screening
Currently, no vaccines exist for Hepatitis C, but it is recommended that individuals born between 1940 and 1965 (baby boomers) undergo one-time screening for the infection.
Hepatitis D
Characteristics
Hepatitis D is classified as a defective RNA virus that requires Hepatitis B for its functionality. It has an incubation period that ranges from 14 to 56 days.
Transmission
Transmission occurs through parenteral routes (such as drug use or blood exposure) or through sexual contact.
Laboratory Findings
Diagnosis involves assessing the intrahepatic delta antigen or determining the anti-HDV titer to establish the presence of Hepatitis D infection.
Hepatitis E
Characteristics
Hepatitis E presents with an incubation period of 15 to 64 days and is primarily distinguished as a waterborne infection typically found in developing countries. Its transmission is also through the fecal-oral route, resembling Hepatitis A.
Laboratory Findings
Laboratory work for diagnosing Hepatitis E includes looking for anti-HEV as a marker of the infection.
Complications of Hepatitis
Complications of hepatitis can lead to severe clinical conditions such as:
Severe acute hepatitis (fulminant hepatitis): This can manifest as neuro decline, gastrointestinal bleeding, coagulation disorders, fever, oliguria, edema, and ascites.
Chronic hepatitis: Chronic inflammation that persists longer than 6 months can lead to chronic liver conditions such as cirrhosis or liver cancer, especially in cases of chronic Hepatitis B or C and Hepatitis D co-infection with Hepatitis B.
Treatment Options for Hepatitis
Medications for Hepatitis B
Tenofovir: Renally excreted, associated with bone demineralization; kidney function monitoring is essential.
Adefovir: Renally excreted; requires monitoring of kidney function.
Lamivudine: Renally excreted; monitor for potential flaring of HBV.
Entecavir: Renally excreted; interactions with alcohol require caution. Education on monitoring kidney function is important.
Medications for Hepatitis C
Grazoprevir, Simprevir, Paritaprevir: Second-generation protease inhibitors affecting kidneys and liver functions; lab monitoring is recommended.
Elabasvir: Potentially reactive with HBV and can affect the liver, requiring patient education on liver toxicity.
Ledipasvir/Sofosbuvir: Can adversely affect cardiac function and cause liver failure; thorough evaluations of heart rate and liver tests are necessary.
Sofosbuvir/Velpatasvir: May reactivate HBV, with a risk of liver failure necessitating diligent monitoring of liver tests and HBV status.