British Journal of Anaesthesia, 1988, Vol. 60, No. 6 632-638
© 1988 The Board of Management and Trustees of the British Journal of Anaesthesia
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EFFECT OF THE ADDITION OF ADRENALINE TO EXTRADURAL DIAMORPHINE ANALGESIA AFTER CAESAREAN SECTION
A. J. SEMPLE, F.F.A.R.C.S; D. J. MACRAE B.M.SC, F.F.A.R.C.S; S. MUNISHANKARAPPA, M.B. CH.B., D.A.; L. M. BURROW, M.SC, M.P.S.; M. K. MILNE, D.OBST.R.C.O.G., F.F.A.R.C.S.; I. S. GRANT, F.R.C.P., F.F.A.R.C.S.I.; Departments of Anaesthesia and Pharmacy, Ninewells Hospital and Medical School, Dundee DD1 9SY.
In a randomized double-blind study the effect of the addition of adrenaline to extradural dia-morphine was assessed in 54 patients after Caesarean section. Patients received extradural diamorphine 5 mg in saline 10 ml with or without adrenaline 1 in 200 000 for postoperative pain relief. Analgesia was profound and of rapid onset in both groups. Duration of analgesia was greater in the adrenaline group (time to next analgesia 12.51 ± 0.94 h, mean ± SEM), than in the saline group (9.87 ± 0.98 h) (P = 0.057). Analgesia was also more consistent in the adrenaline group, with 77% of patients having more than 8 h of good analgesia compared with 48% in the saline group (P < 0.05). Plasma morphine concentrations, measured in 12 patients, were lower, although not significantly so, in the adrenaline group and mean time to peak concentration markedly delayed. No serious side effects were observed, but there was a higher incidence of vomiting in the adrenaline group.
*Present address: Department of Anaesthesia, Brompton Hospital, Fulham Road, London SW3 6HP.
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