Interactions/Pregnancy/Neonatal Flashcards
Breastfeeding advice
- Only if 36 week VL<50, on ART>10 weeks and at least 2 undetectable VL at least 4 weeks apart
- for 6 month only
- Not with mixed feeding, definitely no solids, if have to use small amount of formula occasionally, new BHIVA statement says this is ok (when establishing BF, when switching off BF, gastro in either and mastitis)
Risk of HIV transmission with breastfeeding in setting of well controlled HIV
- Breastfeeding to 6 months: 3/1000 risk
- Breastfeeding to 12 months: 6/1000 risk
TAF with PI dose adjustment
PIs and cob inhibit P-gp transporter that usually pumps TAF back into gut lumen, thus TAF levels will be higher
So reduced TAF dose to 10mg with PI/cobi
Statins
- Simvastatin/lovastatin contraindicated with PIs
- Caution with atorvastatin, start low, don’t exceed 20mg, fluvastatin might be better.
- Generally all statins are fine with INSTIs/NRTIs
- NNRTI (EFV/NVP) may interact so either dose monitoring or choose rosuvastatin
Assessment of post natal mental health and sexual health screening in pregnancy
Assess maternal mental health at 4-6 weeks and 3-4 months post partum.
Sexual health screening is recommended if newly diagnosed with HIV in pregnancy, otherwise it is suggested
When should you wait for resistance testing when initiating ART in pregnancy?
Before 28 weeks, after 28 weeks start anyway
(if pt stops ART post delivery, get another one to try and capture mutations)
When to check CD4 in pregnancy?
- If conceiving on ART, one at baseline and one at delivery
- If start ART in pregnancy, as per usual guidelines plus another at delivery (even if starting one was >350)
When to check VL in pregnancy?
- If starting ART in pregnancy then 2-4 weeks after starting, at least every trimester, at 36 weeks and at delivery (and do LFTs each time)
- If already on ART??
A pregnant woman has not suppressed viral load, what to do?
- Asses adherence
- Resistance test
- Review other meds
- Consider TDM
- Optimise regimen
- Consider intesnsification
What ART in pregnancy should be switched?
- PI monotherapy
- Darunavir/cobi, Elvitegravir/cobi
- Raltegravir 1200mg OD should be switched to 400mg BD
- Women on dolutegravir TTC or in first trimester should be advised to take folic acid 5mg (rest can take usually 400mcg)
All pregnancy women, including elite controllers should start ART in pregnancy, when should they start?
- If viral load <30,000 as soon as able to do so in the 2nd trimester
- VL 30,000-100,000 then at start of 2nd trimester
- VL>100,000 or CD4<200 then in first trimester
- All should have started by 24 weeks
What ART to start in pregnancy?
- Backbone: any combination of TDF, abacavir, emtricitabine, lamivudine. TAF only if after 1st trimester
- 3rd agent: best evidence for EFV or atazanavir, alternatively rilpivirine 25mg OD, raltegravir 400mg BD, darunavir/rit 600/100mg (could give BD), or dolutegravir if after 6 weeks gestation
- Consider an INSTI if baseline VL>100,000 or where ART failing to suppress
- (Zidovudine mono therapy only if women declining ART, VL<10,000 and willing to have C-section)
What ART to start in late presenting woman (ie. over 28 weeks)?
- If viral load unknown or >100,000 start a 3 or 4 drug regimen that includes raltegravir 400mg BD or dolutegravir 50mg OD
Management of untreated woman in labour?
(if no documented HIV test, INSTI should be done and actions started without waiting for confirmation)
- Stat oral NVP 200mg (crosses placenta in 2 hours and maintains effective concentrations in neonate for up to 10 days)
- Commence ART with oral zidovudine 300mg, lamivudine 150mg BD and raltegravir 400mg BD (also crosses placenta rapidly)
- IV ziduvudine for duration of labour, loading with 2mg/kg for first hour, the maintenance at 1mg/kg/hr until cord clamped
- In pre-term labour consider addition of double dose TDF to further load infant (poor oral absorption anticipated)
When might you considered TDM in pregnancy?
- Dosing off licence or particularly if combining TDF and atazanavir/r
HIV-2 in pregnancy
- Case discussion with experts
- Boosted PI based regimen such as darunavir/r is recommended
- General recommendations in HIV2 are for 2NRTI (ideally TDF/FTC) with second gen iNSTI (BD DTG) or DAR/r (BD)
What tests to do on diagnosis of new Hep B infection in pregnancy?
- HBV, ‘e’ antigen status, Hep D, HCV, HAV (?need immunising) and tests to assess liver inflammation and fibrosis (Fibroscan and biopsy relatively contraindicated)- AST, ALT, alb, INR
- Fib 4 index, or AST to platelet ratio (APRI), and ultrasound liver/spleen if advanced disease suspected
ART in Hep B in pregnancy
- Should include TDF (or TAF if after 1st trimester)
- FTC/3TC can be omitted and TDF/TAF as sole anti-HIV treatment if known FTC/3TC resistance
- Cannot give 3TC/FTC as sole anti-HBV agent
- FTC better than 3TC
Hep A vaccination in pregnancy with HBV diagnosis
- After first trimester at 0 and 6 months
- If CD4<100 additional dose (0, 1 and 6 months) recommended
Preventing vertical transmission HBV
- NVD can be recommended regardless of HBV viral load
- Neonatal immunisation +/- HBIG within 24 hours delivery
- BF does not seem to increase transmission although possibly with cracked nipples etc.
Which babies should get HBIG?
- Maternal HBV DNA >E6
- HBeAg pos
- anti-HBe negative/unknown
Management of HCV detected in pregnancy
- Confirm HCV RNA, HBV, HAV, LFTs, ALT/AST, Alb/plt/INR, consider non-invasive scoring for fibrosis (Fib4 or APRI), ultrasound liver.spleen
- Repeat LFT 2 and 4 weeks after starting ART as well as all other routine bloods
- Monitor HCV VL although treatment is not recommended in pregnancy
- Ensuring HIV VL suppressed will help reduce HCV VT
Antenatal management (invasive testing and ECV)
- Invasive pre-natal testing should not be done until HIV status is known and ideally deferred until VL<50
- If not on ART and cannot delay, start ART including raltegravir 400mg and give stat NVP 2-4 hours before procedure
- ECV if VL<50
Mode of delivery depending on 36 week VL
- <50, planned NVD
- 50-399, PLCS should be considered
- > 400 PLCS recommended
Timing of PLCS to prevent VT
Between 38 and 39 weeks
Management of SROM depending on HIV VL
- <50: induction of labour aiming for birth <24 hours
- 50-399: CS advised
- > 400 CS recommended
Very low risk, low risk and high risk neonatal PEP regimens
START WITHIN 4. HOURS
Very low risk (mother on ART>10 weeks, 2 HIV VL<50 at least 4 weeks apart and 36 week VL <50): 2 weeks zidovudine monotherapy
Low risk: (not all of above but 36 weeks VL<50): zidovudine 4 weeks
High risk (36 VL >50 or not known): 2 weeks NVP, 4 weeks lamivudine + zidovudine
(generally give zidovudine when VL<50 even if known maternal resistance, if VL>50 seek. expert advice)
Neonatal PEP in HIV2
- Same as HIV1 of low and very low risk
- NVP won’t work if high risk so zidovudine, lamivudine, raltegravir
Neonatal HIV testing in non breast fed baby
- During first 48 hours life
- (If high risk at 2 weeks)
- At 6 weeks (or at least 2 weeks after stopping PEP)
- At 12 weeks (or at least 8 weeks after stopping PEP)
- HIV antibody test 22-24 months
Neonatal HIV testing in breastfed infant
- During 48 hours prior to discharge
- At 2 weeks
- Monthly whilst BF
- 4 and 8 weeks after stopping BF
- HIV antibody testing at 22-24 months or minimum 8 weeks after stopping BF if this is later
Tmax, Cmax, Cmin, AUC, definitions
- Tmax: Time to reach maximum concentration
- Cmax: actual concentration
- Cmin: minimum concerntraion
- AUC: area under the curve is total exposure to drug in the systemic circulation
Which ART can prolong QT?
- Atazanavir
- Lopinavir
- Ritonavir
- Rilpiverine (supra therapeutic doses)
- Cabotegravir/rilprivirine
- Efavirenz