Revista Brasileira de Ginecologia e Obstetrícia (Apr 1999)
Saturação de oxigênio fetal medida pela oximetria de pulso durante o trabalho de parto: relações com o ph da artéria umbilical Fetal oxygen saturation measured by pulse oximetry during labor: relation to umbilical artery pH
Abstract
Objetivos: estudar os níveis de saturação de oxigênio fetal (SpO2) durante o trabalho de parto pela técnica da oximetria de pulso e sua relação com o pH da artéria umbilical (AU). Pacientes e Métodos: a SpO2 fetal foi medida durante o parto por meio da técnica da oximetria de pulso em 50 casos. Comparou-se a média dos valores de SpO2 entre os dois períodos do trabalho de parto, sendo o primeiro subdividido em fases, segundo a dilatação cervical ( ou = 7,20 e ou = 30,0%. Resultados: as médias da SpO2 fetal no primeiro período do parto foram de 53,0 ± 7,3% e 44,2 ± 6,8%, e no segundo 46,8 ± 7,7% e 38,4 ± 7,1% (pH da AU > ou = 7,20 e ou = 7,20) foram de 55,1 ± 5,1% (Purpose: to study fetal oxygen saturation (SpO2) levels during labor by continuous pulse oximetry tecnique, and its relation to umbilical artery (UA) pH. Patients and Methods: fetal SpO2 levels were measured during labor by the pulse oximetry technique in 50 subjects. Average values of SpO2 were compared between the first and second stage of labor, with the first stage further subdivided into phases, according to cervical dilatation of ( or = 7.20 and or = 30.0% was considered normal. Results: fetal SpO2 averages during the first stage were 53.0 ± 7.3% and 44.2 ± 6.8% (UA pH > or = 7.20 and or = 7.20) were 55.1 ± 5.1% (<=4 cm), 52.3 ± 4.6% (5-7 cm) and 51.5 ± 7.2% (8-9 cm); for UA pH <7.20, the fetal SpO2 averages were 46.3 ± 5.1% (<=4 cm), 43.6 ± 6.7% (5-7 cm) and 42.8 ± 5.8% (8-9 cm). Considering the UA pH, these differences were statistically significant (p<0.01). Conclusion: a significant decrease of oxygen saturation values was observed during labor when fetal pulse oximetry was used.
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