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Vitamin D3 supplementation during pregnancy and lactation for women living with HIV in Tanzania: A randomized controlled trial.
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- Author(s): Sudfeld, Christopher R.1,2 (AUTHOR) ; Manji, Karim P.3 (AUTHOR); Muhihi, Alfa4 (AUTHOR); Duggan, Christopher P.2,5 (AUTHOR); Aboud, Said6 (AUTHOR); Alwy Al-Beity, Fadhlun M.7 (AUTHOR); Wang, Molin8,9,10 (AUTHOR); Zhang, Ning9 (AUTHOR); Ulenga, Nzovu4 (AUTHOR); Fawzi, Wafaie W.1,2,9 (AUTHOR)
- Source:
PLoS Medicine. 4/15/2022, Vol. 19 Issue 4, p1-20. 20p. 2 Diagrams, 4 Charts, 2 Graphs.- Subject Terms:
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- Subject Terms:
- Abstract: Background: Observational studies suggest that vitamin D deficiency among people living with HIV is associated with a greater risk of disease progression and death. Low levels of vitamin D in pregnancy are also associated with poor fetal and infant growth. Therefore, vitamin D supplementation may improve clinical outcomes for pregnant women living with HIV and improve fetal and postnatal growth for their infants. Methods and findings: We conducted a randomized, triple-blind, placebo-controlled trial of vitamin D3 supplementation among pregnant and lactating women living with HIV in Dar es Salaam, Tanzania (ClinicalTrials.gov NCT02305927). Participants were randomized with 1:1 allocation stratified by study clinic to receive either daily 3,000 IU vitamin D3 supplements or matching placebo supplements from the second trimester of pregnancy (12–27 weeks) until 1 year postpartum. The primary outcomes were (i) maternal HIV progression or death, (ii) small-for-gestational-age (SGA) live births (<10th percentile), and (iii) infant stunting at 1 year of age (length-for-age z-score < −2). We also examined the effect of vitamin D3 supplementation on secondary maternal and infant health outcomes, maternal and infant serum 25-hydroxyvitamin D (25[OH]D) concentrations, and maternal hypercalcemia. An intent-to-treat analysis was used as the primary analytic approach. We enrolled 2,300 pregnant women between June 15, 2015, and April 17, 2018, and follow-up of mothers and infants was completed on October 20, 2019. There were 1,148 pregnant women randomly assigned to the vitamin D3 group, and 1,152 to the placebo group. The proportion of mothers lost to follow-up at 1 year postpartum was 6.6% in the vitamin D3 group (83 of 1,148) and 6.6% in the placebo group (76 of 1,152). The proportion of children lost to follow-up at 1 year of age was 5.5% in the vitamin D3 group (59 of 1,074 live births) and 5.2% in the placebo group (57 of 1,093 live births). There was no difference in the risk of maternal HIV progression or death, with 166 events during 1,461 person-years of follow-up in the vitamin D3 group and 141 events during 1,469 person-years of follow-up in the placebo group (hazard ratio 1.21, 95% CI 0.97 to 1.52, p = 0.09). There was no difference in the risk of SGA birth between the vitamin D3 (229 SGA births among 1,070 live births) and placebo groups (236 SGA births among 1,091 live births) (relative risk 1.03, 95% CI 0.87 to 1.22, p = 0.70). There was also no difference in the risk of infant stunting at 1 year of age between the vitamin D3 (407 events among 867 infants) and placebo groups (413 events among 873 infants) (relative risk 1.00, 95% CI 0.92 to 1.10, p = 0.95). In terms of adverse events, no cases of maternal hypercalcemia were identified. One hypersensitivity reaction to the trial supplements occurred for a pregnant woman in the placebo group. A limitation of our study is that our findings may not be generalizable to HIV-negative pregnant women or contexts where severe vitamin D deficiency is prevalent. Conclusions: The trial findings do not support routine vitamin D supplementation for pregnant and lactating women living with HIV in Tanzania. Trial registration: ClinicalTrials.gov Identifier: NCT02305927. Christopher R. Sudfeld and colleagues, investigate the impact of vitamin D supplementation on clinical outcomes for pregnant women living with HIV, and growth outcomes for their infants. Author summary: Why was this study done?: Observational studies have found that vitamin D deficiency among people living with HIV is associated with an increased risk of HIV disease progression and death. Low levels of vitamin D in pregnancy are also associated with adverse birth outcomes and poor infant growth. What did the researchers do and find?: We conducted a randomized controlled trial of maternal vitamin D3 supplementation during pregnancy and lactation and found no effect on the primary trial outcomes of maternal HIV progression or death, small-for-gestational-age (SGA) live births, and infant stunting (length-for-age z-score < −2) at 1 year of age. There was no effect on most secondary outcomes; however, we found that vitamin D supplementation decreased the risk of death for mothers and increased the risk of preterm birth. Maternal vitamin D supplementation increased maternal serum 25-hydroxyvitamin D (25[OH]D) concentrations throughout follow-up and increased infant 25(OH)D at 6 weeks and 6 months of age, but not at 12 months of age. What do these findings mean?: The trial findings are not in support of routine vitamin D supplementation for pregnant and lactating women living with HIV. The mixed findings on the secondary outcomes of maternal death and preterm birth should be interpreted with caution and require replication in other randomized trials. [ABSTRACT FROM AUTHOR]
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