Abstract
Background
Evidence remains limited on the association between maternal ozone (O3) exposure and congenital heart defects (CHDs) in offspring, and few studies have investigated the interaction and modification of paternal smoking on this association.
Methods
Using a sample including pregnant women at high risk of fetal CHD (with metabolic disease, first-trimester viral infection, family history of CHD, etc.) from a maternal–fetal medicine study covering 1313 referral hospitals in China during 2013–2021, we examined the associations between maternal O3 exposure during 3–8 weeks of gestational age and fetal CHD in offspring and investigated the interaction and modification of paternal smoking on this association. CHD was diagnosed by fetal echocardiograms, maximum daily 8-hour average O3 exposure data at a 10 km × 10 km spatial resolution came from the Tracking Air Pollution in China dataset, and paternal smoking was collected using questionnaires. Logistic regression models were used to estimate adjusted odds ratios (ORs) and 95% confidence intervals (CIs).
Results
Among 27,834 pregnant women at high risk of fetal CHD, 17.4% of fetuses were diagnosed with CHD. Each 10 μg/m3 increase in maternal O3 exposure was associated with a 17% increased risk of CHD in offspring (OR = 1.17, 95% CI = 1.14–1.20). Compared with paternal nonsmoking and maternal low O3 exposure, the ORs (95% CI) of CHD for smoking and low O3 exposure, nonsmoking and high O3 exposure, and smoking and high O3 exposure were 1.25 (1.08–1.45), 1.81 (1.56–2.08), and 2.23 (1.84–2.71), respectively. Paternal smoking cessation seemingly mitigated the increased risk of CHD.
Conclusions
Maternal O3 exposure and paternal smoking were interactively associated with an increased risk of fetal CHD in offspring, which calls for effective measures to decrease maternal exposure to O3 pollution and secondhand smoke for CHD prevention.
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Data availability
Data will be made available on request.
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Funding
This work was supported by the National Natural Science Foundation of China (82073573 to ZZY, U21A20523 to HYH), the Beijing Key Laboratory of Maternal–Fetal Medicine in Fetal Heart Disease (BZ0308 to HYH), and the National Key Research and Development Program of China (2022YFC3703502 to LJ).
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WH and RYP were co-first authors and contributed equally to this work. WH and RYP contributed to conceptualization, methodology, investigation, formal analysis, visualization, and writing of the original draft. MS, WYQ and WXY contributed to investigation, acquisition of data, visualization, reviewing and editing. HYH, LJ and ZZY contributed equally to conceptualization, acquisition of data, reviewing and editing, funding acquisition, and supervision. All authors read and approved the final manuscript.
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This study was approved by the Ethics Committee of Beijing Anzhen Hospital, Capital Medical University (ID: 2022060X). All participants provided written informed consent.
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Wang, H., Ruan, YP., Ma, S. et al. Interaction between ozone and paternal smoking on fetal congenital heart defects among pregnant women at high risk: a multicenter maternal–fetal medicine study. World J Pediatr (2023). https://doi.org/10.1007/s12519-023-00755-1
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DOI: https://doi.org/10.1007/s12519-023-00755-1