Ortoski Objectives Flashcards
What are the 3 conditions for transmission of HIV?
HIV must be present in…
- Body fluid
- In sufficient quantity
- Portal of entry into bloodstream
What 3 things is transmission of HIV leading to disease progression dependent on?
- Size of viral inoculin
- Virulence of infecting virus (how fit is the virus and what is it’s replication capacity)
- Patients cytotoxic lymphocyte response (CD8)
What are the 3 basic modes of HIV transmission?
- Sexual
- Blood
- Vertical
What is sexual transmission associated with?
Traumatic sex (anal), multiple partners, and lack of protection
What are some influencing factors with sexual transmission?
Oral/vaginal/anal receptive, no condom, genital ulcer (syphilis, active herpes)
What is associated with blood HIV transmission?
Transfusion/transplant before 1985, drug use, occupational exposure
What can reduce the risk of vertical transmission during pregnancy?
AZT
There are 14 AIDS defining conditions listed… name as many as you can.
- Candidiasis of respiratory system, esophagus
- Cervical cancer – invasive
- Coccidioidomycosis
- Cryptosporidiosis
- CMV (retinitis)
- Herpes simplex chronic ulcers (> 1 mo duration)
- HIV related encephalopathy
- Isorporiasis (chronic intestinal)
- Kaposi’s sarcoma (HHV8)
- Lymphoma
- MAC complex, mycobacterium TB, PCP, toxoplasmosis
- Recurrent pneumonia (>2 infections in 12 mo)
- Progressive multifocal leukoencephalopathy (PML)
- Salmonellosis
What are main general categories of HIV testing?
Antibody testing and viral assays
When can antibody testing be done for HIV?
6 month waiting period exists after infection (the time needed for the immune system to make Antibodies
What are 6 tests for HIV that are antibody tests?
- ELISA
- Western blot
- OraSure OraQuick Advance
- Unti-Gold Recombigen and Reveal G2
- Multispot
- P24 Antigen Capture Assay
What antibody test is a screening test that is non-specific?
ELISA
What antibody test is a confirmatory test with decreasing false results?
Western Blot
What antibody test detects Ab to HIV1 and HIV2 in whole blood, oral fluids, and plasma with results in 20 minutes?
OraSure, OraQuick Advance
What antibody test detects antibodies to HIV1 in serum and plasma?
Uni-Gold Recombigen and Reveal G2
What antibody test detects antibodies to HIV1 and HIV2 in serum and plasma?
Multispot
What antibody test measures the chief component of nucleocapsid?
P24 antigen capture assay
What is a vrial RNA Assay?
Measures the viral load of HIV…HIV RNA by PCR and HIV branched DNA
When is a DNA PCR assay used?
In newborns and needle exposure patiens
When can you say HIV+?
Multiple antibody results or a single viral load assay
Ex. 2 ELISAs and 1 Western Blot
What will be positive with an acute retroviral infection symptoms in a primary HIV infection?
1 Viral Load Assay
ACTG
AIDS clinical trials group
ADAP
AIDS drug assistance program
AMfar
American foundations of AIDS research
CD4 cells
T-Helper Cells
CD8 cells
Cytotoxic Cells
Discordant couples
Those sexually active partners where one is HIV+ and the other is HIV-
Expanded Acess
Initial monitored access to medications prior to public access
HAART/ART
High active antiretroviral therapy (the cocktail)
HIV1
Virus that causes AIDS/ HIV2 most prevalent in Africa
IDU
Intravenous drug user
Immune Reconstitution
Ability of immune system cells to replenish themselves with memory
Index (source) patient
The individual known to have been the source of the infection
MAC/DM Avium
Mycobacterium Avium Complex/ Disseminated Mycobacterium Avium
MSM
Men who have sex with men
Entry Inhibitor
Inhibits HIV entry into the host cells
Integrase
Inhibits integrase within the host nucleus
Inhibitor
Inhibits maturation of virion at exit from host cell
Maturation
Nucleoside reverse transcriptase inhibitors
Inhibitor
Necleotide reverse transcriptase inhibitor
NRTI
Non-nucleoside reverse transcriptase inhibitors
NtRTI
Protease Inhibitors
NNRTI
D4t, ddl, ddC, AZT
Mutations
Amino acid changes that occur within the genome of the virus
Nadir CD4
Lowest number reached
Naive
No prior exposure to a certain drug
OIs
Opportunistic infections, AIDS defining illness
PHI/Acute Retroviral Syndrome
Primary HIV infection: Flu-mono-like symptoms associated with acute infection
Reverse Transcriptase/Protease/Integrase
Viral enzymes, proteins, needed for viral replication
Sequestered virus/mutations
Those viruses or viral mutations that are in the minority and not detectable
Sexual Exposure
Passive versus active/Receptive versus insertive
VL
Viral load- Estimated amount of virus in the blood stream
VL set point
Highest viral load without HAART
Viral Fitness
Ability of virus to replicate in a defined environment
Replication capacity
Reasonable proxy for viral fitness
Viral Reservoir
Areas where virus is maintained and not read into serum viral load assay
Wild Type Virus
Original virus without mutations
Quasi Species
Multiple mutations in the virus of one host
What should be done on examination for HIV infected individual?
- Weight
- LN Enlargement
- CMV retinitis
- Oral Lesion
- Hepatosplenomegaly
- Abdominal masses
- Genital sores/warts/STD lesions
- DRE or anal cancer (caution/not done in severely immunocompromised patients)
- Neuro
- Joint and muscle pain
What serial tests should be done every 3 months and when needed for HIV patients?
- CBC and Plts – leucopenia, anemia, thrombocytopenia (can be due to HIV or meds)
- Chemical profile - Liver enzymes, elevated globulin fraction of total protein, serum albumin, amylase and lipase, renal function (creatinine clearance can dec due to meds, urinalysis shows positive proteins in renal damage)
What are 2 HIV related lab tests done on patients with HIV?
- CD4 absolute count and percent
2. Viral load assays: PCR (bDNA, NASBA)
What are 2 examinations that are done on a different schedule in HIV patients?
- Cervical/Rectal Pap (more frequently done)
2. PSA/Prostate (earlier)
What testing should be done yearly as indicated?
- PPD Mantoux
- STD Testing (GC/CT, RPR)
- Urine Protein (especially for those on tenofovir)
What testing should be done initially and at intermittent screening? (5 things)
- HLAB 5701: For hypersensitivity reaction with abacavir
- Hepatitis A/B/C
- Toxoplasmosis and CMV: Requires baseline IgG
- Free testosterone levels: For wasting/depression in men
- Lactic acid levels: W/ use of D drugs and for unexplained pain
What are 6 vaccines given to HIV patients?
- Hepatitis A/B
- Influenza (yearly)
- MMR
- Tdap
- Pneumococcal
6, HPV (females 9-26)
What vaccines are contraindicated in HIV patients?
LIVE ONES
- Varicella Zoster
- MMR (Only if patients CD4 count is under 200)
What can assess relative risk of disease progression and time of death along with providing an assessment of efficacy of antiretroviral therapies for HIV patients?
Viral Load Assays
What are 3 things that a viral load assay can do?
- Measure HIV
- Study pathogenesis
- Determine HIV Kinetics (replication)
With respect to a viral load assay, equilibrium is established between what?
Viral replication and immune response
True or False: Viral load assays can show viremia when culture reveals none
TRUE
How fast should HIV RNA decrease upon starting treatment?
With in days
If you have an adherent patient, how long until Nadir (or lowest possible viral load count) is reached in a HIV patient after starting treatment?
16-24 weeks
What can increases of RNA viral load reveal?
Outgrowth of drug-resistant HIV-variants or non-adherence to drugs
What RNA level change is associated with a biologically and clinically relevant change?
Over 0.5log10
What are viral blips?
Insignificant low level rises
True or False: Undetectable means eradication
FALSE: Undetectable doesn’t mean eradication…this is not possible with today’s drugs
What are some viral reservoirs?
Lymphoreticular system, GALT (GI Lymph Tissue), CNS, Gential tract
What are 3 uses of CD4 counts?
- Assess extent of immune system damage
- Assess relative risk of disease progression and time of death
- Provide assessment of risk of developing opportunistic infections
What is done with regards to CD4 number?
Prophylactic medication is given
True or False: With immune reconstitution, discontinuation of meds is possible
TRUE
With a CD4 count under 200, what do you give for prophylaxis?
TMP-SMX for pnuemocystis jiroveci (PCP)