Intrapartum Oxygen for Fetal Resuscitation: State of the Science

Abstract

Purpose of Review This review aims to summarize the current evidence regarding maternal oxygen supplementation for Category II fetal heart tracings (FHT) in labor. We aim to evaluate the theoretical rationale for oxygen administration, the clinical efficacy of supplemental oxygen, and the potential risks. Recent Findings Maternal oxygen supplementation is an intrauterine resuscitation technique rooted in the theoretic rationale that hyperoxygenating the mother results in increased oxygen transfer to the fetus. However, recent data suggest otherwise. Randomized controlled trials on the efficacy of oxygen supplementation in labor suggest no improvement in umbilical cord gases or other adverse maternal and neonatal outcomes compared to room air. Two meta-analyses demonstrated that oxygen supplementation is not associated with an improvement in umbilical artery pH or reduction in cesarean delivery. Although we lack data on definitive clinical neonatal outcomes with this practice, there is some suggestion of adverse neonatal outcomes with excess in utero oxygen exposure, including lower umbilical artery pH. Summary Despite historic data suggesting the benefit of maternal oxygen supplementation in increasing fetal oxygenation, recent randomized trials and meta-analyses have demonstrated a lack of efficacy of this practice and some suggestion of harm. This has led to conflicting national guidelines. Further research is needed on short-and long-term neonatal clinical outcomes following prolonged intrauterine oxygen exposure.

Anestesia Obstétrica: Innovaciones Y Desafíos en La Cesáreas

“…El control hemodinámico durante la cesárea debe ser similar al utilizado para otros procedimientos quirúrgicos (15). Antes del parto, se debe administrar oxígeno de forma rutinaria para optimizar la oxigenación fetal (16). Es importante tener en cuenta las complicaciones potenciales como la hipotensión, dolor de cabeza pospunción dural, complicaciones neurológicas y absceso epidural asociadas con la anestesia raquídea en la cesárea (17).…”