“…The intrathecal approach has been used for the control of pain after orthopaedic, abdominal and open-heart surgery, and for the control of pain in labour and myocardial infarction (GJESSING & TOMLIN 1981, PAS-QUALUCCI et a1 1981, BARAKA et a1 1981, BENGTS-SON et al 1983, KALSO 1983, TAKASAKI & ASANO 1983, JONES et a1 1984, PATERSON et a1 1984.…”