Combination of dexamethasone and local anaesthetic solution in peripheral nerve blocks: A meta-analysis of randomised controlled trials. Issue 11 (November 2015) - Huynh, Thi Mum
Abstract : BACKGROUND: Dexamethasone decreases postoperative pain and prolongs the duration of local anaesthetic peripheral nerve blocks in studies including a limited number of patients. OBJECTIVE: The objective of this study is to evaluate the effect of combining dexamethasone with local anaesthetic on sensory and motor peripheral nerve blockade in adults. DESIGN: A systematic review with meta-analysis of randomised controlled trials. DATA SOURCES: We systematically searched in Medline, Embase, Google Scholar and Cochrane Controlled Trials Register up to December 2013. ELIGIBILITY CRITERIA: Randomised trials testing dexamethasone combined with local anaesthetic. RESULTS: Twelve trials (1054 patients, 512 receiving perineural dexamethasone) were included. Ten studies evaluated dexamethasone for brachial plexus nerve block. Four to 10 mg dexamethasone-containing local anaesthetic solutions had a faster onset of action and resulted in a significant increase in the duration of analgesia [weighted mean difference (WMD) 351 min, 95% confidence interval (95% CI) 288 to 413, P < 0.001] and motor blockade (WMD 277 min, 95% CI 167 to 387, P < 0.001) compared with local anaesthetic solutions alone. Time to onset of sensory and motor blocks was significantly reduced with dexamethasone (WMD −78 s, 95% CI −112 to −44, and −90 s, 95% CI −131 to −48, respectively). Dexamethasone significantly decreased postoperative nausea and vomiting (PONV, 9 vs. 27%, relative risk 0.36, 95% CI 0.19 to 0.70). Subgroup analyses showed that dexamethasone approximately doubled the duration of postoperative analgesia when it was combined with intermediate-acting (lidocaine, mepivacaine) or long-acting (bupivacaine, ropivacaine) local anaesthetics. CONCLUSION: Combining dexamethasone with local anaesthetics results in a prolongation of the duration of peripheral nerve block. Abstract : Supplemental Digital Content is available in the text