SPINAL ANAESTHESIA FOR CAESAREAN SECTION: The use of 0.5% bupivacaine

Subarachnoid anaesthesia was induced with 0.5% bupivacaine 2–3.5ml in 33 women scheduled for elective Caesarean section. Threepatients failed to develop adequate analgesia with bupivacainebut were managed satisfactorily with heavy cinchocaine. Allthe other patients developed adequate nnnlgirin eventually.Since the spread of analgesia was uniquely dependent on posturea new hypothesis is presented to explain the distribution ofintrathecal anaesthetic drugs in late pregnancy.