British Journal of Anaesthesia, Vol 83, Issue 2 253-256, Copyright © 1999 by The Board of Management and Trustees of the British Journal of Anaesthesia
T. F. Cobby, I. M. Crighton, K. Kyriakides and G. J. Hobbs
We have evaluated the morphine-sparing effect of rectal paracetamol during
the first 24 h after abdominal hysterectomy in a placebo- controlled,
double-blind study. We studied 72 patients receiving patient-controlled
analgesia (PCA) with i.v. morphine after a standardized anaesthetic,
allocated randomly to receive rectal paracetamol 1.3 g, diclofenac 50 mg or
placebo, after wound closure and at 8 and 16 h. Suppositories were blinded
by the hospital pharmacy. Study violations excluded data from seven
patients. Patient data, morphine doses during anaesthesia and recovery, and
sedation and nausea scores were comparable. Mean morphine consumption
during PCA was 35.0 (SD 20.4) mg, 32.7 (27.4) mg and 54.9 (28.3) mg in the
paracetamol (n = 24), diclofenac (n = 20) and placebo (n = 21) groups,
respectively (P < 0.05). Morphine sparing during PCA for paracetamol and
diclofenac (36% vs 40% over 24 h) was significant from 4 h. Global scores
of average pain over 24 h were lower after diclofenac compared with
paracetamol (P < 0.01) and placebo (P = 0.08). We conclude that rectal
paracetamol was an efficacious adjuvant analgesic after regular dosing.
CLINICAL INVESTIGATIONS
Rectal paracetamol has a significant morphine-sparing effect after hysterectomy
University Department of Anaesthetics, Queen's Medical Centre, Nottingham NG7 2UH, UK
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