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Revista Brasileira de Anestesiologia
On-line version ISSN 1806-907X
CASTRO, Carlos Henrique Viana de et al. Correlation between the inspired fraction of oxygen, maternal partial oxygen pressure, and fetal partial oxygen pressure during cesarean section of normal pregnancies. Rev. Bras. Anestesiol. [online]. 2009, vol.59, n.4, pp. 452-460. ISSN 1806-907X. http://dx.doi.org/10.1590/S0034-70942009000400007.
BACKGROUND AND OBJECTIVES: Despite changes in pulmonary function, maternal oxygenation is maintained during obstetric regional blocks. But in those situations, the administration of supplementary oxygen to parturients is a common practice. Good fetal oxygenation is the main justification; however, this has not been proven. The objective of this randomized, prospective study was to test the hypothesis of whether maternal hyperoxia is correlated with an increase in fetal gasometric parameters in elective cesarean sections. METHODS: Arterial blood gases of 20 parturients undergoing spinal block with different inspired fractions of oxygen were evaluated and correlated with fetal arterial blood gases. RESULTS: An increase in maternal inspired fraction of oxygen did not show any correlation with an increase of fetal partial oxygen pressure. CONCLUSIONS: Induction of maternal hyperoxia by the administration of supplementary oxygen did not increase fetal partial oxygen pressure. Fetal gasometric parameters did not change even when maternal parameters changed, induced by hyperoxia, during cesarean section under spinal block.
Keywords : PHYSIOLOGY [Oxygen transport]; PHYSIOLOGY [Fetal oxygenation]; SURGERY, Obstetric [cesarean section].