Liposomal bupivacaine as one component of the postoperative management of limb amputations in cats: a retrospective study.

Abstract

OBJECTIVES: The objective of this study was to evaluate the impact of liposomal bupivacaine (LB) as part of an opioid-sparing multimodal analgesic protocol on postoperative pain control in cats undergoing limb amputation surgery compared with traditional pain management protocols more heavily reliant on injectable opioid and non-opioid analgesics. METHODS: Medical records of 29 cats that underwent forelimb or hindlimb amputation were reviewed to evaluate postoperative systemic pain medications utilized, appetite and time to discharge as presumptive gauges of postoperative pain. Statistical analysis of the data included Wilcoxon's rank-sum test and Fisher's exact test. RESULTS: Of the 29 cats, seven (24%) did not receive LB and 22 (76%) did. No statistically significant differences were found between the two groups in the outcome variables evaluated. The median time to eating was similar (6.0 h in the LB group vs 5.0 h in the non-LB group), the median time to discharge was shorter in the LB group (25.0 h vs 42.0 h in the non-LB group) and the median time to discontinuation of opioids in the LB treatment group was shorter than the non-LB group (18.0 h in LB group vs 22.0 h non-LB). A lower proportion of the LB group needed adjuvant systemic analgesics compared with the non-LB group (5% LB vs 29% non-LB). CONCLUSIONS AND RELEVANCE: The addition of liposomal bupivacaine to an analgesic protocol after limb amputation in cats is associated with reduced opioid dosing, earlier return to eating and earlier hospital discharge. The use of LB may minimize the negative side effects associated with systemic opioid administration and therefore decrease patient morbidity. Future studies are needed to definitively compare LB efficacy and safety for postoperative pain control and traditional systemic analgesic medications.