“…126,130,131]. Fifty-four trials used bupivacaine as their long-acting local anaesthetic[32-35, 38, 40-44, 46-48, 50, 51, 54, 55, 57-59, 61, 62, 64-66, 68-72, 76, 77, 79, 85, 89- 91, 93, 94, 98-101, 103, 104, 106, 112, 116-118, 122, 124- 126], 14 used levobupivacaine[37, 45, 63, 73, 78, 82, 83, 86, Twenty-three trials used lidocaine in the local anaesthetic admixture[33, 41, 44, 46-48, 50, 51, 57, 62, 64, 66, 69, 89, 90, 98, 99, 101, 104, 112, 113, 115, 124], while 15 added epinephrine to the local anaesthetic[41,42,44,47,48,51,57,62,66,69,89,90,112,113,124]. 116], 61 studies had some risk of bias[33,34,36,37, 43, 47, 48, 52, 55, 57, 58, 61, 67, 68, 70, 71, 73-75, 77-80, 83-85, 87-91, 95-106, 108, 109, 111, 114, 117-123, 125-131] and 4 studies were at high risk of bias[41,63,86,124].Figure 1Similarly, pairwise meta-analysis of 53 trials for sensory block duration[73-111, 113-122, 125, 126, 128, 129] and 53 trials for motor block duration[73-111, 113- 122, 125, 126, 128, 129] comparing perineural dexmedetomidine vs. control arms did not reveal any sub-group differences by indexing status (see online Supporting Information).…”