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FETAL BLOOD FLOW DURING INTRATHECAL ANAESTHESIA FOR ELECTIVE CAESAREAN SECTION

Fetal aortic and umbilical blood flows were studied in 15 mothers before and during spinal (intrathecal) anaesthesia for elective Caesarean section, using a method combining real-time ultrasonography and a pulsed Doppler technique. Spinal anaesthesia with 0.5% bupivacaine hydrochloride 2.5ml in 8% glucose monohydrate solution was administered after preloading with 2 litre of lactated Ringer's solution. Simultaneously with the subarachnoid injection, an infusion i. v. of ephedrine 50 mg in 500 ml normal saline was initiated. Maternal heart rate and systolic arterial pressure remained stable during the spinal anaesthesia, but diastolic arterial pressure decreased ( P P P