Type and timing of antiretroviral therapy during pregnancy: Impact on risk of preterm delivery and small-for-gestational age births in Canada, a retrospective cohort study.

Abstract

To evaluate the impact of type and timing of antiretroviral therapy (ART) on the risk of preterm delivery (PTD) and small-for-gestational age (SGA) birth among pregnant women and people living with HIV in Canada. Data for this retrospective cohort study were analyzed from the Canadian Perinatal HIV Surveillance Program from 1990 to 2020. The association between ART and risk of PTD (<37 weeks) and SGA birth(<10th percentile)was explored using mixed effects logistic regression and time-dependent Cox proportional hazards models. Overall, there were 14.9% (654 of 4379) PTD and 18.5% (732 of 3947) SGA cases. A higher risk of PTD was observed with nonnucleoside reverse transcriptase inhibitor-(adjusted hazard ratio [aHR], 1.73; P=0.019) and boosted protease inhibitor-(aHR,186;P=0.007)based regimenscompared with integrase strand transfer inhibitor (INSTI)-based regimens. ART initiation prior to conception was associated with a lower risk of SGA birthcompared with ART initiation after conception at 1 to 14 weeks (adjusted odds ratio [aOR], 0.69; P=0.024) and > 14 weeks (aOR, 0.70; P=0.005). INSTI-based ART regimens were associated with lower risk of PTD compared with other regimens, and ART initiation before conception was associated with a lower risk of SGAbirth. These findings, with overall safety data, should be considered when providing pregnancy counseling to people living with HIV.