EclampsiaPlacentaOxygenMagnesium SulfatePregnancyPre-EclampsiaMaternal MortalityHELLP SyndromePlacenta DiseasesDelivery, ObstetricOxygen ConsumptionPlacenta PreviaPuerperal DisordersHypertension, Pregnancy-InducedPlacenta AccretaDrug Delivery SystemsReactive Oxygen SpeciesPlacenta, RetainedPregnancy OutcomePregnancy Complications, CardiovascularCesarean SectionObstetric Labor ComplicationsInfant, NewbornPregnancy ComplicationsGestational AgeAbruptio PlacentaeTrophoblastsPosterior Leukoencephalopathy SyndromeTocolytic AgentsObstetricsPostpartum HemorrhageMaternal-Fetal Exchange