HIV Flashcards
Role of CD4+ count?
Major lab indicator of immune fxn in pts infected with HIV
Serves as a key factor in determining both the urgency of antiretroviral therapy (ART) initiation
Need for prophylaxis against opportunistic inf
What’s HIV?
HIV is a RNA retrovirus that attacks the immune system, mainly the CD4+ T cells => progressive decrease in CD4+ T cell count.
What should be measured in pts who are on tx? Why?
Plasma HIV-1 RNA (viral load)
Bcuz viral load is the most important indicator of response to antiretroviral therapy
What does viral load quantifies?
The degree of viremia by measuring the amt of HIV RNA in the blood and used to
Assess dx progression AND possible drug resistance
Howz HIV transmitted?
Infected blood, serum and vaginal secretions
How does vertical transmission of HIV occur?
Pregnancy
At birth
Through breastfeeding
Effect of ART (antiretroviral therapy)?
Dramatically reduced HIV-associated morbidity and mortality
What are the primary goals of antiretroviral therapy (ART)?
Restore and preserve the immune system
Suppress HIV viral load to undetectable levels
Reduce HIV-associated morbidity, prolong survival and prevent transmission
What’s recommended in ALL HIV-infected individuals?
ART is recommended
Also recommended for HIV-infected individuals for the prevention of HIV transit mission including to sexual partners
What needs to be done by pts for ART regimen to be effective long-term?
Adherence rate of 95% or higher in order for ART regimen to be effective
Whats the 1st step in HIV replication cycle? Agent(s) that work here?
Fusion of HIV to the host cell surface
Fusion inhibitor and CCR5 antagonist
Whats the 2nd step in HIV replication cycle? Agent(s) that work here?
HIV RNA reverse transcriptase, Integrase and other viral proteins enters the host cells
None
Whats the 3rd step in HIV replication cycle? Agent(s) that work here?
Viral DNA is formed by reverse transcription
NRTIs and NNRTIs
Whats the 4th step in HIV replication cycle? Agent(s) that work here?
Viral DNA is transported across the nucleus and integrates into the host DNA
Integrase Strand Transfer Inhibitors
Whats the 5th step in HIV replication cycle? Agent(s) that work here?
New viral RNA is used as genomic RNA and to make viral proteins
None
Whats the 6th step in HIV replication cycle? Agent(s) that work here?
New viral RNA and proteins move to the cell surface and a new, immature, HIV forms
None
Whats the 7th step in HIV replication cycle? Agent(s) that work here?
The virus mature by protease releasing individual HIV proteins
PIs
What lab parameters must be done as baseline b4 therapy starts?
CD4+ count + HIV RNA viral load (prior to ART initiation or modification, 2-8 wks post initiation, then Q3-6months thereafter)
Drug resistance testing (ART initiation and modification)
Lipid panel, blood chemistry, CBC with differential (prior to ART initiation, modification and Q6-12 months)
What does an increase in HIV RNA viral load indicate?
Drug resistance and/or inadequate tx response
What does a decrease in CD4+ count indicate?
Predictor of dx progression
What are some common complications of ART?
Lactic acidosis and severe hepatomegaly with steatosis
Immune reconstitution inflammatory syndrome (IRIS or IRS)
Lipodystrophy/lipoatrophy
Fat redistribution/lipohypertrophy
Diarrhea
How do u deal with Lactic acidosis and severe hepatomegaly with steatosis (common complications of ART)?
Suspend tx.
Most common with NRTIs
What’s Immune reconstitution inflammatory syndrome (IRIS or IRS)?
A paradoxical worsening of a preexisting opportunistic inf when ART is initiated
What’s the most common pathogens associated with Immune reconstitution inflammatory syndrome (IRIS or IRS)?
M. tuberculosis M. avium Pneumocystis jirovecii pneumonia (PCP) Herpes simplex virus (HSV) Herpes zooster Cytomegalovirus (CMV) Cryptococcus Hepatitis B