Brazilian Journal of Anesthesiology
https://bjan-sba.org/article/doi/10.1590/S0034-70942009000400007
Brazilian Journal of Anesthesiology
Scientific Article

Correlação entre a fração inspirada de oxigênio, a pressão parcial de oxigênio materno e a pressão parcial de oxigênio fetal durante parto cesáreo em gestações normais

Correlation between the inspired fraction of oxygen, maternal partial oxygen pressure, and fetal partial oxygen pressure during cesarean section of normal pregnancies

Carlos Henrique Viana de Castro; Marcos Guilherme Cunha Cruvinel; Fabiano Soares Carneiro; Yerkes Pereira Silva; Antônio Carlos Vieira Cabral; Roberto Cardoso Bessa

http://dx.doi.org/10.1590/S0034-70942009000400007 Braz J Anesthesiol, vol.59, n4, p.452-460, 2009
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Resumo

JUSTIFICATIVA E OBJETIVOS: Apesar das alterações na função pulmonar, a oxigenação materna se mantém nas anestesias regionais para obstetrícia. Mesmo assim, nessas situações, o fornecimento de oxigênio suplementar para a mãe é prática disseminada. A principal justificativa é a boa oxigenação fetal; entretanto, não há devida comprovação. Este estudo prospectivo e com distribuição randômica das pacientes teve o objetivo de testar a hipótese da existência ou não de correlação entre hiperóxia materna e elevação de parâmetros gasométricos fetais na cesariana eletiva. MÉTODO: Foram estudadas vinte pacientes grávidas, submetidas à raquianestesia, através de gasometrias arteriais, com diferentes frações inspiradas de oxigênio e correlacionadas com a gasometria fetal. RESULTADOS: O aumento da fração inspirada de oxigênio materno não se correlacionou com o aumento da pressão parcial de oxigênio fetal. CONCLUSÕES: A indução de hiperóxia materna através de oxigenoterapia suplementar não foi capaz de aumentar a pressão parcial de oxigênio no feto. Não houve modificação nos parâmetros gasométricos fetais, mesmo em caso de mudança desses parâmetros na parturiente, induzidos pela hiperóxia durante a cesariana sob raquianestesia.

Palavras-chave

CIRURGIA, Obstétrica, FISIOLOGIA, FISIOLOGIA

Abstract

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, PHYSIOLOGY, SURGERY, Obstetric

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