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Objective To observe fetal arteriolar oxygen saturation during maternal epidural analgesia. Design An observation study of 27 epidural top-ups.

Setting Labour ward, St James's University Hospital and Leeds General Infirmary, Leeds University, UK.

Sample Seventeen fetuses in uncomplicated labour monitored with a N400 fetal pulse oximeter. Outcome measure A change in fetal pulse oximetry reading following epidural analgesia.

Results There is no change in fetal oxygen saturation following an uncomplicated epidural top-up (F = 0.93; df 35 and 784).

Conclusion An uneventful maternal epidural has no measurable effect on fetal oxygen saturation measured with a N400 pulse oximeter.