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  • Title: Continuous infusion of bupivacaine reduces postoperative morphine use in adolescent idiopathic scoliosis after posterior spine fusion.
    Author: Ross PA, Smith BM, Tolo VT, Khemani RG.
    Journal: Spine (Phila Pa 1976); 2011 Aug 15; 36(18):1478-83. PubMed ID: 20881514.
    Abstract:
    STUDY DESIGN: Retrospective analysis. OBJECTIVE: To determine if an infusion of bupivacaine will reduce the need for intravenous opioids following posterior spine fusion. SUMMARY OF BACKGROUND DATA: Adolescent idiopathic scoliosis is estimated to occur with a frequency of 1% to 3% among the at-risk age group of 10 to 18 years. A small percentage of these patients will require surgical intervention. Data are limited regarding continuous infusion of local anesthetic after posterior spine fusion for pain control. METHODS.: Retrospective review of children 10 to 18 years with idiopathic scoliosis admitted to a tertiary care, 20-bed pediatric intensive care unit (P pediatric intensive care unit), following posterior spine fusion. The primary outcome was postoperative opioid use stratified by the presence of a catheter for continuous bupivacaine. Secondary outcomes included pain scores, side effect management, depth of catheter placement, and fluid resuscitation. RESULTS: Two hundred and forty-four children were eligible, 129 received a catheter for continuous bupivacaine, 115 did not. There were no differences in demographics. Significantly fewer patients receiving bupivacaine required a continuous basal infusion of morphine (32.6% vs. 85.2%, P < 0.001) resulting in an overall reduction opioid use on postoperative day 1 (18.9 vs. 26.4 mg, P < 0.001). Overall, pain scores were low in both groups. Limiting the analysis to only those with a bupivacaine catheter, the depth of catheter placement did not impact postoperative opioid use (P > 0.15). CONCLUSION: The use of a continuous infusion of bupivacaine provided good analgesia with low pain scores. The significant reduction in basal morphine use may reflect a replacement by bupivacaine, although this is limited by potential treatment bias. Multivariate analysis was required to control for ongoing changes in anesthesia practice over the many years of the study. The optimal depth of catheter placement is unclear from this analysis and should be studied prospectively.
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