Fig. 4From: Optimal dose of perineural dexmedetomidine to prolong analgesia after brachial plexus blockade: a systematic review and Meta-analysis of 57 randomized clinical trialsSubgroup analysis by 20 μg increments of perineural DEX on DOA when combined with long-acting LA. Abbreviations: DEX, dexmedetomidine; CI, confidence interval; DOA, duration of analgesia; LA, local anesthetic; IV, intravenousBack to article page