Obstetric analgesia, anaesthesia and the Apgar score.

This study examines the changing pattern of maternal analgesia administration during the decade 1970-1979. In addition, the relationship between analgesia, anaesthesia and the infant's Apgar score was documented. Approximately 40000 deliveries to South Glamorgan residents were included in the study. Over the two quinquennia 1970-1974 and 1975-1979 the administration of epidural block increased from 5.6% to 17.5%. The Apgar score of babies in the epidural block group was significantly better in the latter period. Respiratory depression following Caesarean section remains a problem. The group delivered by elective Caesarean section contained a substantial proportion of infants with a low Apgar score; 30% had an Apgar score less than 8 and 10% had a score of less than 4. Likely causative factors include undue sensitivity of the infants' respiratory centre and aortocaval compression during surgery.