Selenium and Preeclampsia: a Systematic Review and Meta-analysis
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Conflicting results exist between selenium concentration and preeclampsia. The role of selenium in the development of preeclampsia is unclear. We conducted a meta-analysis to compare the blood selenium level in patients with preeclampsia and healthy pregnant women, and to determine the effectiveness of selenium supplementation in preventing preeclampsia. We searched PubMed, ScienceDirect, the Cochrane Library, and relevant references for English language literature up to November 25, 2014. Mean difference from observational studies and relative risk from randomized controlled trials were meta-analyzed by a random-effect model. Thirteen observational studies with 1515 participants and 3 randomized controlled trials with 439 participants were included in the meta-analysis. Using a random-effect model, a statistically significant difference in blood selenium concentration of −6.47 μg/l (95 % confidence interval (CI) −11.24 to −1.7, p = 0.008) was seen after comparing the mean difference of observational studies. In randomized controlled trials, using a random-effect model, the relative risk for preeclampsia was 0.28 (0.09 to 0.84) for selenium supplementation (p = 0.02). Evidence from observational studies indicates an inverse association of blood selenium level and the risk of preeclampsia. Supplementation with selenium significantly reduces the incidence of preeclampsia. However, more prospective clinical trials are required to assess the association between selenium supplementation and preeclampsia and to determine the dose, beginning time, and duration of selenium supplementation.
KeywordsSelenium Preeclampsia Systematic review and meta-analysis
We thank Juan Ji (School of Public health, Nanjing Medical University) for the methodological support. We are also grateful to the authors of the studies included in this review.
Shuyan Lv conceptualized and designed the study; Min Xu, Dan Guo, and Li Zhang acquired, analyzed, or interpreted the data; Min Xu drafted the manuscript; Min Xu and Hao Gu performed critical revision of the manuscript for important content; and Min Xu performed the statistical analysis.
Compliance with Ethical Standards
This research received no specific grant from any funding agency or commercial or not-for-profit sectors.
Conflict of Interest
The authors declare that they have no competing interests.
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