HIV + candidiasis Flashcards
Candida can cultured what which body sites?
ORAL cavity
GASTROINTESTINAL tract
GENITAL tract
What proportion of the general population have candida species as a commensal organism?
75%
What impact does HIV have on the rate of commensal candida prevalence?
HIGHER rates
What is the main pathological manifestation of candida in PLW HIV?
Mucosal candidiasis
Which mucosal candidiasis is most common in PLW HIV?
OROPHARYNGEAL
What proportion of PLW HIV prior to HAART availability experienced oropharyngeal candidiasis?
80-90%
What impact does HIV have on the likelihood of vulvovaginitis from candida?
similar to immunocompetent people
Which candida species is the most common cause of candida infection?
candida ALBICANS
What increases the risk of NON-ALBICANS candida species in PLW HIV?
previous AZOLE therapy
advanced IMMUNOSUPPRESSION
What proportion of candida species are NON-ALBICANS in PLW HIV?
30%
Name THREE NON-ALBICANS species of candida?
1) GLABRATA
2) KRUSEI
3) DUBLINESIS
Which candida species has INTRINSIC azole RESISTANCE?
candida KRUSEI
Through what mechanism does AZOLE resistance develop in candida species?
INTRINSIC resistance or recurrent DRUG EXPOSURE or combination of above
What species of candida is inherently multi drug resistant and can be a cause of candidaemia?
candida AURIS
What does the immunological response involve against candida species?
T helper(Th) 17 T cells at gastronintestinal MUCOSA or SKIN
What impact does HIV have on Th17 T cells?
disproportionately DEPLETED
early stages of HIV-associated T cell decline
disrupts host SURVEILLANCE
causing PATHOGENICITY
How long do PLW HIV show impaired T cell response to candida after starting treatment?
over TWO (2) years
What other clinical factor or patient demographic increases risk of oropharyngeal candidiasis in PLW HIV?
PWID
TB
Do candida species thrive in an acidic or alkaline environment?
ACIDIC
What is oropharyngeal candidiasis a predictor of in PLW HIV?
worsening IMMUNODEFICIENCY
From onset of oropharyngeal candidiasis, what is the time to development of AIDS in PLW HIV?
25 months
What are the various oral presentations of oral candidiasis?
ERYTHEMATOUS (red patches + depapillation tongue)
HYPERPLASTIC (white plaques, cannot scrape away)
ANGULAR CHEILITIS
What are the typical symptoms of oropharyngeal candidiasis?
ASYMPTOMATIC
SORE mouth or throat
What respiratory symptoms are associated with oropharyngeal candidiasis?
increased PHLEGM
chronic COUGH
HOARSENESS
Through what mechanisms can GORD and oesophageal candidiasis co-exist?
GORD increased ACIDIC environment
candida THRIVE in acidic environment
mucosal DAMAGE from GORD
candida INVADES more easily
What symptoms are associated with EROSIVE oesophagitis in PLW HIV?
HEARTBURN
ACID REGURGITATION
What features of dysphagia should raise the suspicion of oesophageal carcinoma in PLW HIV?
no response to CANDIDA treatment
WEIGHT LOSS
What clinical risk factors increase risk of oesophageal cancer?
GORD
heavy ALCOHOL use
SMOKING
Does oesophageal candidiasis occur without oropharyngeal candidiasis?
NOT typically
may be more likely if on ART
should look for other causes of GI symptoms
What is the sensitivity of clinical diagnosis of oropharyngeal candidiasis vs microbiological detection?
SIMILAR
therefore clinical diagnosis is sufficient
Why are empiric or prophylactic antimicrobials not recommended in candida prevention in PLW HIV?
promote RESISTANCE
When is candida culture indicated in oropharyngeal candidiasis?
PERSISTING signs or symptoms despite anti fungal
RECURRENT infection
Why is candida culture indicated for persisting or recurrent candida infection?
identify AZOLE -resistant infection
As an alternative to swabbing a lesion for investigation of mucosal candidiasis what else can be performed?
oral or vaginal RINSE
What is the most common medium for culturing candida species?
BLOOD agar
What does the presence of candida in blood culture always indicate?
INVASIVE disease
candidaemia
When is endoscopy indicated in oesophageal candidiasis?
TREATMENT FAILURE
NO OROPHARYNGEAL infection
ALTERNATIVE diagnosis is suspected
What is NON-PHARMACOLOGICAL management of oropharyngeal candidiasis?
good ORAL HYGIENE
regular REMOVAL or oral BIOFILM
What feature of the oral biofilm affects treatment of oropharyngeal candidiasis?
inherently resistant to azoles
What preparation of pharmacological treatment is most effective at treating oropharyngeal candidiasis?
ORAL fluconazole
c/w
topical therapy
What dose treatment is recommended for FIRST episode OROPHARYNGEAL candidiasis?
Fluconazole 100mg DAILY for 7 days
When is a higher or longer course of fluconazole indicated for treatment of oropharyngeal candidiasis?
SEVERE or RELAPSED disease
What step up regimen is indicated for oropharyngeal candidiasis if first line treatment does not work?
INCREASE dose and duration
Fluconazole 200mg, 7-14 days
What are the disadvantages of topical therapy for oropharyngeal candidiasis?
SLOWER clearance of yeast
higher RELAPSE rate
reduced TOLERABILITY
When can topical therapy be used for treatment of oropharyngeal candidiasis?
MILD infection
no recurrence
fluconazole intolerance
What is the typical topical therapy used in oropharyngeal infection?
NYSTATIN (100 000units/mL)
What is the regimen for nystatin in oropharyngeal candidiasis?
5ml (5 drops) FOUR (4) times a day
7-14 days
What other topical agents can be used in oropharyngeal candidiasis?
Amphotericin
Clotrimazole
What agent can be used to disrupt the oral biofilm formation in oropharyngeal candidiasis?
0.2% CHLORHEXIDINE mouthwash
What group of people are at increased risk of oral biofilm formation?
DENTURE wearers
Which TWO agents can be used to treat OESOPHAGEAL candidiasis?
FLUCONAZOLE
ITRACONAZOLE
What is the typical regimen for OESOPHAGEAL candidiasis?
Fluconazole 200-400mg DAILY
14-21 days
In mild oesophageal candidiasis, what is the recommended regimen with fluconazole?
Fluconazole 200mg
14 days
Why is fluconazole the preferred option over itraconazole for treatment of oesophageal candidiasis?
better BIOAVAILABILITY
less Drug-drug interactions
What preparation of itraconazole should be used for oesophageal candidiasis?
oral SOLUTION
Why is oral solution preparation of itraconazole recommended if used for oesophageal candidiasis?
better BIOAVAILABILITY
What factors affect absorption of itraconazole in PLW HIV?
low CD4 cell
ANTACID preparations
What alteration to proton pump inhibitors (PPI) should be made when treating with fluconazole for oesophageal candidiasis?
WITHOLD whilst treatment for
ACUTE or SEVERE candidiasis
(PPI can inhibit activity of fluconazole)
If a person requires acid suppression therapy but ideally would withold PPI for treatment of oesophageal candidiasis, what is an alternative?
switch to SHORTER-acting treatment
H2 antagonist - RANITIDINE
Through what pathway is itraconazole metabolised?
cytochrome P450 enzymes
Due to its metabolism which drugs should itraconazole not be administered with?
ENZYME-inducing - RIFAMYCINS
What is the benefit of fluconazole metabolism if requiring to coadminister with enzyme inducers?
excreted in urine UNCHANGED
not effected by enzyme inducers
What is the alternative class of drugs for treatment of oesophageal candidiasis in people with HIV and liver disease?
ECHINOCANDIN
When can oral suspension of itraconazole or posaconazole be used for treatment of oropharyngeal candidiasis?
fluconazole RESISTANCE
What monitoring is required for people on AZOLEs?
regular LIVER FUNCTION tests
What azole regimen does not require liver function monitoring?
LOW-DOSE fluconazole (100mg daily or less)
Which azole should be avoided in CONGESTIVE HEART FAILURE?
ITRACONAZOLE
When is therapeutic drug monitoring indicated in treatment of oropharyngeal candidiasis?
non-fluconazole agents
ITRACONAZOLE, POSACONAZOLE, VORICONAZOLE
variable bioavailability
Considering various azoles for oesophageal candidiasis, which order should they be used when considering efficacy and toxicity?
FLUCONAZOLE ITRACONAZOLE POSACONAZOLE ISAVUCONAZOLE VORICONAZOLE
If azoles cannot be used for oesophageal candidiasis what classes can be used?
ECHINOCANDINS
FUNGINS (caspofungin, micafungin, anidulafungin)
IV amphotericin B
Which FUNGIN has a comparable efficacy to fluconazole for treatment of oesophageal candidiasis?
MICA-FUNGIN
What is the summarised approach to FLUCONAZOLE-REFRACTORY/NON-SUSCEPTIBLE oropharyngeal or oesophageal candidiasis?
try ITRACONAZOLE then alternative AZOLE then ECHINOCANDIN
What is the first line treatment for vulvovaginal candidiasis in PLW HIV?
CLOTRIMAZOLE pessary 500mg
If evidence of severe vulvovaginal candidiasis what additional step can be taken?
repeat FLUCONAZOLE oral 72 hours later
If recurrent vulvovaginal candidiasis what is the recommended regimen?
Fluconazole 150mg every 72 hours (THREE doses)
then
WEEKLY for 6 months
What is the recommended treatment for vulvovaginal non-albicans candida if reduced fluconazole susceptibility?
NYSTATIN 100 000units PESSARY nightly
14 days
What alternative treatments to nystatin can be used for non-albican vulvovaginal candidiasis?
5-flucytosine (vaginal cream) + nystatin
amphotericin pessary
boric acid
Can fluconazole be used as continuous therapy to reduce recurrence of oropharyngeal or oesophageal candidiasis?
possible
no increase in treatment–refractory disease
not recommended
What is the difference in dosing of fluconazole for oropharyngeal vs oesophageal candidiasis?
ORAL - 100-200mg daily
OESOPHAGEAL - 200-400mg daily
ITRACONAZOLE dosing for oropharyngeal or oesophageal candidiasis?
ITRACONAZOLE 200mg TWICE daily (oral SOLUTION)
POSACONAZOLE dosing for oropharyngeal or oesophageal candidiasis?
POSACONAZOLE 400mg TWICE daily
then
400mg DAILY
oral SUSPENSION
ISAVUCONAZOLE dosing for oropharyngeal or oesophageal candidiasis?
ISAVUCONAZOLE 200mg LOADING dose then 100mg DAILY or 400mg LOADING then 400mg WEEKLY
What ART can antifungal AMPHOTERICIN interact with?
Tenofovir disoproxil
What ART can antifungal CASPOFUNGIN interact with?
Efavirenz
Nevirapine
What ART can antifungal FLUCONAZOLE interact with?
zidovudine nevirapine rilpivirine cobicistat tenofovir alafanemide
What ART can antifungal ISAVUCONAZOLE interact with?
tenofovir alafanemide
Efavirenz
lopinavir/ritonavir
etravirine
What ART can antifungal ITRACONAZOLE interact with?
ritonavir or cobicistat etravirine, efavirenz, nevirapine maraviroc rilpivirin tenofovir alafanemide
What ART can antifungal POSACONAZOLE interact with?
cobicistat
efavirenz
rilpivirin
ATAZANAVIR
What ART can antifungal VORICONAZOLE interact with?
efavirenz etravirine lopinavir/ritonavir rilpivirine cobicistat
What effect does FLUCONAZOLE have on ZIDOVUDINE, NEVIRAPINE, RILPIVIRINE?
INCREASED levels
What effect does COBICISTAT have on FLUCONAZOLE?
INCREASED levels
Which ART classes commonly have drug-drug interaction with AZOLES?
NNRTI
boosted PIs