Preeclampsia and timing of delivery: Disease severity, maternal and perinatal outcomes.

Objectives: This study aimed to elucidate clinical characteristics, disease severity, and obstetric outcomes in women with pregnancy complicated with preeclampsia stratified by gestational age at delivery.

Study Design: This retrospective study was conducted at a tertiary care facility from January 2011 to December 2020.

Main Outcome Measures: Maternal characteristics, risk factors, clinical signs and symptoms, laboratory test results, and maternal and perinatal outcomes were compared between early (<34 weeks) versus late (≥34 weeks) and preterm (<37 weeks) versus term (≥37 weeks) preeclampsia.

Results: More than half of the women (56 %, 612/1094) had preterm preeclampsia. Overall, 30 % (329/1094) delivered before 34 weeks of gestation. Pregnancies with early preeclampsia had the worst maternal signs and symptoms, the highest median blood pressure level, and more abnormal laboratory abnormalities compared to those with late preeclampsia. Additionally, women with co-morbid diseases (chronic hypertension, chronic kidney disease, and systemic lupus erythematosus) were more likely to develop early than late preeclampsia. Of note, although adverse maternal and perinatal events occurred more commonly in early rather than late preeclampsia, 18 % (7/39) of eclampsia and 16 % (8/50) of hemolysis, elevated liver enzymes, and low platelet count syndrome cases occurred after 37 weeks of gestation.

Conclusions: Early preeclampsia posed the highest risk to the mother and infant(s); however, adverse maternal and perinatal events were still present even in cases of preeclampsia at term. Therefore, it is crucial for healthcare practitioners to remain vigilant and manage all cases with great care to prevent adverse outcomes.