EFFECT OF SEGMENTAL EXTRADURAL ANALGESIA ON PLACENTAL BLOOD FLOW DURING NORMAL LABOUR

Abstract
Placental blood flow was measured during the first stage of normal labour using a xenon-133 clearance technique before and after segmental extradural analgesia. Analgesia was produced with 0.5% plain bupivacaine in eight patients and with 0.5% bupivacaine-adrenaline in 10 patients. Segmental extradural analgesia with a small dose (20 mg) of bupivacaine did not change placental blood flow significantly. The addition of adrenaline 20 μg produced no effect.

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