Association of Whole Blood Copper and Preeclampsia: A Cohort Study in China
Abstract Background Preeclampsia is a leading cause of maternal and fetal morbidity and mortality. The associations between whole blood copper and pre-eclampsia were controversial. Our study was aimed to investigate the association between whole blood copper concentration and preeclampsia in pregnant woman in China.Methods This retrospective cohort study was conducted between August 1, 2019 to December 31, 2019 in a comprehensive tertiary hospital in Foshan city Guangdong Province, China. We measured copper concentration in maternal whole blood in 12-27 (+6) week of pregnancy, using flame atomic absorption spectrometer. We ascertained preeclampsia diagnosis from electronic medical records system. Covariates included demographic, offspring characteristics, serum biomarkers. Logistic regression was applied to explore the association between the concentration of trace element and preeclampsia.Results A total of 2134 participants were included, 57 (2.67%) women developed preeclampsia. In the multivariate regression models, per1 SD increment in copper was associated with 28% lower risk of preeclampsia (OR=0.72, 95% CI: 0.54-0.95). After Propensity-Score Matching with similar age at delivery and prepregnancy BMI,per1 SD increment in copper was associated with 28% lower risk of preeclampsia (OR=0.70,95% CI:0.51-0.97). We observed some extent evidence of a dose–response trend for Cu (P for trend=0.0321) quintiles. And the result was sustained in mild and severe preeclampsia. Conclusions women with higher blood concentration of copper may associated with lower preeclampsia. More well designed studies are needed for the interpretation of these findings.