“…The incidence of bradycardia and hypotension was described in 28 studies [ 23 , 34 – 37 , 39 – 42 , 45 , 47 , 48 , 51 – 53 , 58 , 61 , 63 , 64 , 66 , 67 , 69 , 78 – 80 , 83 – 85 ] and 26 studies [ 23 , 34 – 36 , 39 – 42 , 45 – 48 , 51 – 53 , 58 , 63 , 64 , 66 , 67 , 69 , 78 – 80 , 84 , 85 ] respectively. Pooled analysis showed that perineural DEX>60 μg increased the risk of bradycardia (risk difference [RD]: 0.16, 95% CI: 0.06 to 0.26, I 2 = 97%, P = 0.002) (Fig.…”