Proteinuria is associated with worse outcomes in babies born to mothers with preeclampsia: A retrospective cohort study at a tertiary referral hospital in Brazil.

To evaluate whether the presence of proteinuria, although no longer mandatory in the revised diagnostic criteria, results in worse maternal and fetal outcomes in preeclampsia (PE). A retrospective cohort study was conducted, analyzing data from pregnant patients diagnosed with PE between January 2015 and December 2019 at a tertiary care center in Brazil. Ethical approval was obtained, and the patient records were reviewed to assess maternal and perinatal outcomes based on the revised diagnostic criteria by the College of Obstetricians and Gynecologists, focusing on the presence or absence of proteinuria. The study included 816 pregnant patients with PE, of whom 685 (83.9%) were diagnosed based on proteinuria. The revised criteria, which include indicators of organ damage, identified an additional 131 cases (16.4%). Analysis showed no significant differences in maternal outcomes between proteinuria and non-proteinuria groups, including intensive care unit (ICU) admission, acute pulmonary edema (APE), HELLP syndrome, eclampsia, or C-section rates. However, babies born to mothers with proteinuria PE experienced worse outcomes, including fetal growth restriction, low birth weight, ICU admission, and higher rates of preterm birth. Relative risk analysis demonstrated a high risk of babies being born with low birth weight, ICU admission, and being born preterm and very preterm in cases where proteinuria was present in mothers with PE. The presence of proteinuria is associated with significantly worse outcomes in babies born to mothers with preeclampsia, while no significant differences were observed in maternal outcomes.