Preeclampsia and low sodium: A retrospective cohort analysis and literature review

•Severe hyponatremia rarely occurs during preeclampsia. Our findings are confirmed by literature.•A mild hyponatremia during pregnancy is physiological. When severe, it needs adequate treatment.•The neonatologist should be alerted in order to treat the neonate for the best outcome. The aim of this study was to retrospectively analyze the prevalence of severe preeclampsia and low sodium (PALS) among the pregnant population admitted at the University Hospital of Udine in the past 4 years and to compare these data with the current literature. Only women with a diagnosis of preeclampsia were included. According to the lowest sodium level measured either 5 days before or 5 days after delivery, patients were divided in two groups: women with hyponatremia (