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Abstract
Objective: We examined the influence of the duration of the second stage of labor on fetal pH levels and oxidative status in uncomplicated pregnancies.Methods: Blood gases in the umbilical artery and serum uric acid and plasma malondialdehyde levels in the umbilical venous blood were measured at delivery in uncomplicated nulliparous women whose second stage of labor was 0–60 min (n=38), 61–120 min (n=14) and 121–180 min (n=6).Results: There were no significant differences in the measured variables between the three groups.Conclusion: The duration of the second stage of labor up to 3 h does not influence lipid peroxidation in the fetoplacental circulation in uncomplicated pregnancies.