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Canadian Journal of Anesthesia, Vol 46, 741-747, Copyright © 1999 by Canadian Anesthesiologists' Society

ARTICLES

Addition of femoral 3-in-1 blockade to intra-articular ropivacaine 0.2% does not reduce analgesic requirements following arthroscopic knee surgery

SK Schwarz, LG Franciosi, CR Ries, WD Regan, RG Davidson, K Nevin, S Escobedo and BA MacLeod
Clinical Pharmacology Research Organization, Department of Pharmacology & Therapeutics, The University of British Columbia, Vancouver, Canada. Schwarz@neuro.pharmacology.ubc.ca

PURPOSE: To test the hypothesis that the addition of a preincisional femoral 3-in-1 block to intra-articular instillation with ropivacaine 0.2% at the end of surgery improves postoperative pain control in patients undergoing arthroscopic anterior cruciate ligament reconstruction (ACLR) under general anesthesia. METHODS: In a prospective, randomized, placebo-controlled, double-blind trial, we studied 44 patients scheduled for inpatient ACLR. Prior to incision, the treatment group (n = 22) received a femoral 3-in-1 block with 40 ml ropivacaine 0.2%, augmented by infiltrations of the lateral and anteromedial incisions with 20 ml ropivacaine 0.2% at the end of the procedure. The control group (n = 22) received saline 0.9% instead of ropivacaine. All patients received an intra-articular instillation with 30 ml ropivacaine 0.2% at the end of surgery. The primary efficacy variable was 24 hr morphine consumption postoperatively standardized by weight, administered intravenously via a patient-controlled analgesia (PCA) pump. RESULTS: There was no difference between both groups in 24 hr PCA morphine consumption postoperatively (control, 0.45 +/- 0.44 [mean +/- SD] mg x kg(-1); treatment, 0.37 +/- 0.50 mg x kg(-1); p = 0.55). No difference was found in postoperative visual analog scale pain scores, adverse events, or vital signs. In the treatment group, R = 10/22 patients did not require postoperative morphine compared with R = 6/22 in the control group (P = 0.35). CONCLUSION: We found no effect of a femoral 3-in-1 block with ropivacaine 0.2% on postoperative analgesic consumption, compared to intra-articular instillation with ropivacaine 0.2% alone, in patients undergoing ACLR under general anesthesia.


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Copyright © 1999 by the Canadian Anesthesiologists' Society.