V. Aasbo et al., NO ADDITIONAL ANALGESIC EFFECT OF INTRAARTICULAR MORPHINE OR BUPIVACAINE COMPARED WITH PLACEBO AFTER ELECTIVE KNEE ARTHROSCOPY, Acta anaesthesiologica Scandinavica, 40(5), 1996, pp. 585-588
Background: Intra-articular pain prophylaxis is a controversial measur
e, adding costs although the benefits are still disputed. We wanted to
evaluate the effects of intra-articular opioid or local anaesthesia o
r a combination of the two on postoperative analgesia and analgesic co
nsumption after elective knee arthroscopy. Methods: 107 patients with
little or no preoperative pain and a minor surgical procedure were stu
died in a prospective, randomized double-blind design. The patients re
ceived midazolam 0.03 mg/kg intravenously before induction of general
anaesthesia with fentanyl 1-2 mu g/kg and propofol 2.0 mg/kg intraveno
usly. Anaesthesia was maintained by a total intravenous technique with
propofol infusion supplemented with alfentanil 10 mu g/kg when needed
. The patients breathed oxygen/air through a laryngeal mask. By the en
d of the surgery they received 20 ml of test drug into the knee-joint:
Group I (BM):20 ml of bupivacaine 2.5 mg/ml with 3 mg of morphine; Gr
oup II(B): 20 ml of bupivacaine 2.5 mg/ml; Group III (M): 20 ml isoton
ic saline with 3 mg morphine; Group IV (P): 20 ml of isotonic saline (
placebo). Results: There were no significant differences between the g
roups in: time to first analgesic administered, analgesic consumption
during the pre-or post-discharge period, nausea, somnolence, side-effe
cts or postoperative pain perception during the first week. Conclusion
s: Intra-articular administration of morphine or bupivacaine is not in
dicated after elective knee-arthroscopy in patients with minor pre-ope
rative pain and a small surgical trauma.