HIV Flashcards
How is HIV transmitted?
- direct contact between infected body fluid (blood, semen, vaginal/rectal secretions, and breast milk)
- direct contact with mucous membranes or open wounds (IV drug use)
- mother-to-child/ vertical transmission through pregnancy, childbirth, or breastfeeding
How often is HIV testing recommended for all patients 13-64 y/o?
once unless other RF
What patients should have HIV screening annually?
- history of other STIs, hepatitis, or TB
- those engaging in high-risk activities (sex with multiple partners/unknown sexual history, MSM, anal/vaginal sex with someone who has HIV, sharing needles/syringes for IV drugs)
What are the symptoms of acute HIV infection?
- non-specific flu-like symptoms few days to several weeks (fever, myalgia, headache, lymphadenopathy, pharyngitis, rash)
- asymptomatic
- no antibody response for weeks -months
When is AIDs diagnosed?
CD4 count <200 cells/mm3
OR
Aids defining condition:
1. opportunistic infection
2. cancers (Kaposi’s sarcoma)
3. HIV wasting syndrome
What medications can be utilized to treat HIV wasting syndrome?
- dronabinol (Marinol, Syndros)
- megestrol (a progestin)
How is HIV diagnosed?
- initial screening for antibodies or antigens
- confirmatory test
- nucleic acid test detecting HIV RNA viral load (if confirmatory test is negative/ indeterminant)
How long does it take for HIV antibodies to be detected?
4-12 weeks after infection; up to 6 months
What OTC HIV test detects the presence of antibodies and provides immediate results?
OraQuick In-Home HIV Test
What are counseling points for OraQuick In-Home HIV Test?
- swab upper and lower gums with the test stick then insert into a test tube containing liquid
- result can be read in 20 minutes
- 1 line (control) is a negative result; 2 lines is a positive result
- testing <3 months after exposure can lead to false negative due to a lag in antibody production
- positive result must follow up for a confirmatory test
What type to virus is HIV?
RNA retrovirus that uses host cell processes to replicate
What are the 8 stages of HIV replication?
- blinding and attachment
- fusion
- reverse transcriptase
- nuclear import
- integration
- transcription/translation
- assembly
- budding and maturation
Why is it important that patients with HIV are adherent to ART (antiretroviral therapy)?
prevent resistance and prolong life
What is tested as an indicator of immune function and will determine the need to prevent OIs?
CD4 count
What is tested as an indicator of ART response?
HIV viral load
What should happen to CD4 count and HIV viral load as a result of starting ART?
- increased CD4
- decreased HIV viral load
What should be monitored for the efficacy of ART?
- CD4 count
- HIV viral load
What are warnings with NRTIs?
- lactic acidosis
- hepatomegaly with steatosis (fatty liver)
What are SEs with NRTIs?
- nausea
- diarrhea
What are the treatment goals of ART?
- achieve and maintain an undetectable viral load
- restore and maintain immune function
- reduce HIV-related morbidity (OIs)
- reduce mortality
- prevent transmission
What are the preferred once-daily, single-tablet regimens for initial ART?
- Biktarvy (bictegravir/emtricitabine/tenofovir alafenamide)
- Triumeq (dolutegravir/abacavir/lamivudine)
- Dovato (dolutegravir/ lamivudine)
What are the preferred once-daily, two-tablet regimens for initial ART?
- Tivicay + Truvada (dolutegravir + emtricitabine/tenofovir disoproxil fumarate)
- Tivicay + Descovy (dolutegravir + emtricitabine/ tenofovir alafenamide)
What drug classes are preferred to include in ART?
2 NRTIs + 1 INSTI
What are the 2 most common NRTI regimens?
- emtricitabine/ tenofovir alafenamide (Descovy)
- emtricitabine/tenofovir disoproxil fumarate (Truvada)
Which 2 NRTIs are both cytosine analogs that would result in antagonism of each other and should not be used together?
lamivudine and emtricitabine
Which medication should not be used for initial treatment if HIV viral load >500,000 or Hep C co-infection (or unknown status)?
Dovato (dolutegravir/lamivudine)
What medication requires HLA-B* 5701 allele testing and what does it mean?
- Triumeq (dolutegravir/abacavir/lamivudine)
- A positive result indicates a higher risk of for severe hypersensitivity reaction in any abacavir-containing product and is CI
What medication has more flexible dosing for CrCl<30?
Biktarvy; the individual components (bictegravir/emtricitabine/tenofovir alafenamide) can be given separately to allow for renal dosage adjustment
How should most HIV medications be dispensed?
dispensed in the manufacturer’s bottle; most medications will come in a 1 month’s supply in the original container
Why are alternative ART regimens using single products/combination products less ideal?
- increased resistance (except PIs)
- decreased patient tolerability
- higher potential for drug interactions
What drugs make up an alternative ART regimen?
1 base (PI (boosted) / NNRTI/INSTI) + 2 NRTIs
How should pregnant patients be treated for HIV?
- continue if already taking ART
- most HIV meds are considered safe in pregnancy
What are preferred regimens in ART-naive pregnant patients?
INSTI (dolutegravir preferred) OR boosted PI (darunavir preferred)
PLUS 2 NRTIs
What medication can be given around the time of delivery to prevent verticle transmission of HIV?
IV zidovudine to mother and newborn
What is immune reconstitution inflammatory syndrome (IRIS)?
unexpected (paradoxical) worsening of a known or unidentified underlying condition after ART is started or starting a more effective ART; the immune system is now capable of mounting an immune response
What conditions may typically worsen due to IRIS?
- OIs
- Hep B and C
- HSV/VZV (shingles)
- autoimmune conditions
- some cancers
When does IRIS typically occur?
when a low CD4 count begins to recover
How is IRIS managed?
continue ART as symptoms are usually self-limiting; treat the unmasked condition
How can the NRTIs be remembered?
Z LATTE
What drugs are in the NRTI class?
Zidovudine
Lamivudine
Abacavir
Tenofovir disoproxil fumarate
Tenofovir alafenamide
Emtricitabine
What is the MOA of NRTIs?
competitively inhibit the reverse transcriptase enzyme, preventing the conversion of HIV RNA to HIV DNA
What NRTI does NOT need renal dosage adjustment?
Abacavir
Why are 2 NRTIs included in a typical ART regimen?
low barrier to resistance (high rates of resistance)
What NRTIs are available as once-daily regimens?
- both forms of Tenofovir
- abacavir
- lamivudine
What NRTIs are available as twice-daily regimens?
- Zidovudine
- abacavir
- lamivudine
What are warnings with all NRTIs
- lactic acidosis
- hepatomegaly with steatosis (fatty liver)
What are BOXED warnings with Zidovudine?
- lactic acidosis
- hepatomegaly with steatosis (fatty liver)
What are the boxed warnings for HBV and HIV co-infections?
- severe acute HBV exacerbation can occur if NRTI is D/C
- Do NOT use Epivir-HBV for the treatment of HIV (contains lower dose of lamivudine than what is needed to treat HIV)
What is a boxed warning for abacavir
risk for hypersensitivity reaction
What type of screening should be done before starting abacavir?
HLA-B*5701 allele; CI if positive
What are warnings with tenofovir TDF>TAF?
- renal impairment including acute renal failure and Fanconi syndrome (renal tubular injury and electrolyte abnormalities)
- decreased bone mineral density; consider calcium/ vitamin D and DEXA scan if at risk
What should be done if a patient on abacavir experiences HSR?
- D/C and never rechallenge
- must carry a medication card indicating the HSR (N/V/D, fatigue, fever, rash, dyspepsia, cough) is an emergency
Abacavir
Ziagen
What is a unique SE with emtricitabine?
hyperpigmentation of the palms of hands or soles of feet
What SE is exclusive to zidovudine and requires monitoring?
- hematologic toxicity
- neutropenia and anemia
- macrocytosis (high MCV) is a sign of adherence
What SE is exclusive to TAF and requires monitoring?
lipid abnormalities; monitor lipids if switching from TDF to TAF
Emtricitabine
Emtriva
Lamivudine
Epivir
tenofovir disoproxil fumarate TDF
Viread
tenofovir alafenamide TAF
Vemlidy (SINGLE ENTITY ONLY USED FOR HBV; combination only for HIV)
Zidovudine
Retrovir
How can integrase strand transfer inhibitors (INSTIs) be remembered?
B CRED; ends in -gravir
What is the MOA of INSTIs?
inhibit the integrase enzyme; prevents HIV DNA from inserting into the host cell DNA
What are SEs with all INSTIs (-tegravir)?
- weight gain
- insomnia
- risk of depression and suicidal ideation in those with pre-existing psychiatric conditions (rare)
Which INSTIs have a higher barrier to resistance?
bictegravir
dolutegravir
What are unique SEs with doultegravir?
- increase SCr (by inhibiting tubular secretion) no change in eGFR
- increase CPK, myopathy, and rhabdomyolysis
- HSR syndrome (rash, fever, symptoms of allergic reaction)
- hepatotoxicity especially if co-infection with hep B or hep C
What are unique SEs with bictegravir?
increase SCr (by inhibiting tubular secretion) no change in eGFR
What are unique SEs with raltegravir?
- increase CPK, myopathy, and rhabdomyolysis
- HSR syndrome (rash, fever, symptoms of allergic reaction)
What are CIs to starting/ continuing Stribild?
CrCl<70: do not start
CrCl<50: discontinue
What is a CI to starting Biktarvy or Genvoya?
CrCl<30