ArticleFrontiers in endocrinology2025
The differential impacts of environmental air pollution exposure on the risk of placenta previa and placenta accreta in twin pregnancies.
Article in Frontiers in endocrinology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: This study aims to investigate the association between exposure to air pollutants during pregnancy (until placental accreta) in twin pregnancies and the risk of abnormal placental positioning and development. Methods: This retrospective study included 3,670 pregnant women with twin pregnancies, classified into three groups: no placenta previa or accreta (3,017 cases), placenta previa (119 cases), and placenta accreta without previa (534 cases). Air pollution data (PM2.5, PM10, SO2, NO2, CO, and O3) were collected from 12 monitoring stations in Chongqing. Exposure estimates were calculated using geocoding based on hospital locations and the nearest stations. Multivariate logistic regression and trend regression analyses, adjusted for confounders, assessed the impact of these pollutants on placenta previa and placenta accreta risk during the 3 months preconception, first trimester, and second trimester. Stratified analyses based on maternal characteristics and restricted cubic spline (RCS) analysis were performed. A dual-pollutant model was used to validate the results. Results: Results showed that none of the six pollutants were significantly associated with placenta previa in either single-pollutant or dual-pollutant models. In the subtypes of placenta previa, NO Conclusion: The mechanisms by which air pollutants affect placenta previa and placenta accreta in twin pregnancies are notably different.
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