Background: We sought to determine whether pregnant women with HIV prescribed integrase strand transfer inhibitor (INSTI) were more likely to have viral suppression at delivery and any increased risk of adverse infant outcomes.
Methods: This was a retrospective, statewide cohort study of women with HIV and their HIV-exposed infants who delivered in South Carolina from 2008 to 2019. Women's antenatal AVRs were classified as INSTI or non-INSTI. We compared the percentage of women with undetectable HIV RNA viral load (<40 copies/mL) at delivery between groups. We compared the percentage of HIV-exposed singleton infants who were born preterm delivery, low birth weight, and small for gestational age and had confirmed perinatal HIV infection. Categorical outcomes were compared using the χ2 test or Fischer exact test.
Results: A total of 832 infants, including 11 sets of twins, were exposed to maternal HIV. Detailed antiretroviral regimens were available for analysis in a third of mother-infant pairs (n = 315). Half of the infants were exposed to INSTI (159) and half to non-INSTI antiretrovirals (156). Most women had an undetectable viral load at delivery (80% INSTI and 73% non-INSTI, P= 0.11). The percentage of singleton infants with adverse outcomes was similar between INSTI and non-INSTI groups: preterm delivery (21% and 16%, P = 0.3), low birth weight (19% and 21%, P = 0.7), small for gestational age (11% vs 9%, P = 0.5), and perinatal HIV infection (2.5% and 1.3%, P = 0.7).
Conclusions: We observed that viral suppression before delivery was similar between pregnant women prescribed INSTI and non-INSTI antiretroviral therapy. The percentage of infants with adverse outcomes was similar when exposed to INSTI and non-INSTI antiretroviral therapy.
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