502 Final Quizlet Flashcards
List the different types of viral hepatitis.
A, B, C, D, E
What type of virus causes Hep A?
RNA Virus
Is there a vaccine to prevent Hep A?
Yes
Is Hep A usually acute or chronic?
Acute condition that will resolve (never chronic)
How is Hep A transmitted?
Fecal into oral route
What type of virus causes Hep B?
Partially double-stranded small nonenveloped DNA virus
How is Hep B transmitted?
Blood and infected fluids
Is Hep B acute or chronic?
Chronic
Is there a vaccine to prevent Hep B?
Yes
What type of treatments are available for Hep B? What is the efficacy of these treatments?
Immune modulators and antivirals. These usually don’t completely eliminate the virus.
What is the mechanism of action of Lamivudine?
Cytosine analogue that acts as a reverse transcription inhibitor. (Inhibits DNA polymerase)
What is the MOA of Adefovir and Tenofovir? How are these activated from the prodrug form?
Adenosine analogue that acts as a reverse transcription inhibitor (inhibits DNA polymerase). Activated by adenylate kinase, which adds a second phosphate group.
What is the MOA of Telbivudine?
It converted to the active form With the addition of what chemical group? Thymidine nucleoside analog that inhibits DNA polymerase and causes chain termination of DNA synthesis. Addition of three phosphate groups.
What type of virus causes Hep C?
Positive-sense single-stranded RNA virus
How is Hep C transmitted?
Blood
Is there a vaccine to prevent Hep C?
No
Is Hep C primarily chronic or acute?
Can be either, but 80% progress to chronic.
What is the goal of treatment for Hep C and how is it measured?
Goal is to cure. This is measured with sustained virologist response, which is the absence of detectable HCV RNA in the plasma for 12 weeks following therapy.
What is the general MOA of the serine protease inhibitors?
Inhibit the actions of the NS3/4A serine protease, which is required to cleave the HCV RNA genome to form proteins used for viral replication. NS3/4A is a non-covalent heterodimer complex, where NS3 has the serine protease catalytic domain and NS4A has an activation subunit domain.
What is the general MOA of the NS5B polymerase inhibitors?
They inhibit the action of RNA polymerase which is needed for viral replication. Some act as nucleotide analog substrates while some bind to almost Eric sites on the enzyme and render it non-functional.
Which drug acts as a uridine nucleotide analog?
Sofosbuvir
How is Sofosbuvir activated? What is the rate limiting step?
It activated during first pass metabolism by hepatic kinases. The rate limiting step is addition of the first phosphate group. Active form is triphosphorylated.
Which drug acts as a non-nucleoside inhibitor at the allots Eric site on polymerase-palm 1?
Dasabuvir
What is the general MOA of NS5A inhibitors?
Inhibit NS5A proteins, which are required for viral replication.
Which fluids can Hep A be transmitted with?
Feces, serum, saliva. Fecal to oral route.
What symptoms do patients with Hep A have?
Usually asymptomatic. But can present flu like symptoms, jaundice, fatigue
Is Hep A usually an acute or chronic condition?
Always acute. Can last up to 9 days, when virus dissolves patient will be immune.
Anti-HAV (IgM)
Active infection
Anti-HAV (IgG)
Immunity (can be from past infection or vaccine, no way to know for sure.)
Anti-HAV (IgG) + Ant-HAV (IgM)
Immunity (can be from past infection or vaccine, we can’t tell)
What are the agents used for prevention of Hep A?
Hep A vaccine and immune globulin (IG) Vaccine is the active form and provides long-term immunity IG is passive and provides temporary immunity Both can be used for pre and post-exposure
How many doses does the Hep A vaccine consist of? When are they administered?
2 doses. One at month 0 and the second 6-18 months late Both brands are interchangeable
What is the youngest age Hep A vaccine can be given to?
1 years old
If someone didn’t get vaccinated as a child, what are some risk factors for Hep A that would make it beneficial for the person to get vaccinated?
Chronic liver disease, men who have sex with men, illegal IV drug users, having clotting factor disorders, occupational risk, living in areas with high prevalence, travel
If a person is traveling internationally to an area with high Hep A risk, what type of pre-exposure protection should they get?
Hep A vaccine, Antoine before travel
If a person is traveling in 2 weeks and is immunocompromised, older than 40, and have CLD, what should they get?
Immune globulin plus Hep A vaccine
If a person is traveling internationally and cannot get vaccinated, what should they receive?
Immune globulin. It will provide protection for 2 months.
How soon after exposure to Hep A should post-exposure prevention be given? Who should receive the vaccine and who should receive immunoglobulin?
Within 2 weeks. Healthy patients 12 months - 40 years old should get the vaccine. Patients that are either immunocompromised, older than 40 years old, have chronic liver disease, or have chronic comorbidities should get immune globulin.
Which body fluids are Hep B mostly found in?
Blood, serum, wound exudates, semen, vaginal fluids, saliva
What are the main routes of transmission for Hep B?
IV drug needle sharing (percutaneous), sexual contact, perinatal (mom to baby)
The younger you are the ________ risk for chronic disease with Hep B?
Greater
After exposure to Hep B, the majority of patients will go on experience ________________ symptoms
Majority will have sub clinical Hep B with no symptoms
What are the 3 developments that can occur after patients have been diagnosed with chronic Hep?
Cirrhosis, mild-moderate Hep, or the patient becomes an inactive carrier.
Infection with Hep B can ultimately cause what serious disease?
Years down the line it can cause liver cancer.
Which 2 types of agents are used for Hep B protection?
Vaccine and immune globulin
What are the brands of the Hep B vaccine? Dosing schedule?
Recombivax HB and Engerix-B Three total doses, one at month 0, one at month 1, and one between months 6-12. They are interchangeable
A new born baby with positive HBsAg status should receive a vaccine when? >2kg <2kg
Vaccine + immune globulin within 12 hours of birth for both
A new born baby with Negative HBsAg status should receive a vaccine when? >2kg <2kg
> 2kg - Vaccine within 24 hours of birth <2kg - Vaccine at day 30 post-birth or at hospital discharge
A newborn baby with Unkown HBsAg status should receive a vaccine when? >2kg <2kg
> 2kg - Vaccine within 12 hours of birth + immune globulin regardless of mom HBsAg status <2kg - Vaccine within 12 hours of birth + immune globulin if mom found HBsAg positive or still
What is Twinrix?
Combo Hep A and Hep B vaccine
How old must a patient be to receive Twinrix?
18 years old
Combo Hep A and Hep B vaccine
Twinrix could be used for (pre and/or post) exposure?
Only pre-exposure
Combo Hep A and Hep B vaccine
What dosing schedule does Twinrix follow?
Hep B schedule; month 0, month 1, and between months 6-12
Incidence of cirrhosis and HCC __________ with increasing HBV DNA level?
Increased
What is the goal of HBV treatment?
HBV DNA suppression; there is no cure
When would you initiate treatment for HBV?
Liver histology: moderate-sever inflammation or fibrosis HBV DNA level: >/= 20,000 HBeAg status: Positive ALT: >2xULN
When would you restart treatment for HBV?
Liver histology: moderate-severe inflammation or fibrosis HBV DNA level: >/= 2,000 HBeAg status: Negative ALT: >2xULN
How is IFN/Peg-IFN administered?
Hep B treatment. Subcutaneous
What are the two common and predictable adverse effects if IFN/Peg-IFN?
Injection site reactions and flu=like symptoms
What is the standard of care for neutropenia during IFN/Peg-IFN treatment?
Do not decrease or hold dose. Can give growth colony stimulating factor
What is the standard of care for thrombocytopenia during IFN/Peg-IFN treatment?
Do not reduce or hold the dose
How are psych manifestations handled while taking IFN/Peg-IFN handled? When do these become a contraindication to treatment?
Give patient an SSRI and psych consult Severe depression, mania, or suicidal ideations
What is the primary difference between tenofovir disoproxil (Viread) and tenofovir alafenamide (Vemlidy)?
TAF is more targeted to the liver; less risk for decrease in bone mineral density and nephrotoxicity.
The majority require ________ of oral agents adjustments for renal impairment for Viread and Vemlidy?
Majority require dose reductions
If patient have to start treatment early in life for HBV, what is the best oral agent to avoid resistance development?
Tenofovir
If a patient has never had lamivudine, what oral agent may be a good option in avoiding resistance?
Entecavir
Which oral agents for HBV are the only ones recommended for Hep B treatment?
Tenofovir, Entecavir, IFN/Peg-IFN
Which side effects are common in HBV oral agents? Which are unique to only certain oral agents?
Common: Diarrhea, nause, and headache (more for tenofovir but common in all) Entecavir - Fatigue Tenofovir - AB pain and dsypepsia