The effect of adding dexmedetomidine to local anesthetic mixture for peribulbar block in vitreoretinal surgeries

The purpose of this study was to compare the effect of adding different doses of dexmedetomidine to local anesthetic mixture for peribulbar block in vitreoretinal surgeries as regards duration, efficacy and pain relief. In this prospective randomized double blind clinical study, 160 patients were equally divided into four groups: Group C (the control group) (n=40) received 10ml mixture of lidocaine 2% and bupivacaine 0.5% with 120IU of hyaluronidase, group D15 (n=40) received a 10ml mixture of lidocaine 2% and bupivacaine 0.5% with 120IU of hyaluronidase+15μg dexmedetomidine, group D20 (n=40) received a 10ml mixture of lidocaine 2% and bupivacaine 0.5% with 120 IU of hyaluronidase+20μg dexmedetomidine and group D25 (n=40) also received a 10ml mixture of lidocaine 2% and bupivacaine 0.5% with 120IU of hyaluronidase+25μg dexmedetomidine. The onset of globe anesthesia and akinesia and their duration, the intraocular pressure (IOP), patient comfort and surgeon satisfaction were all assessed. Data were analyzed and the results were presented as mean ±SD (Standard Deviation) and Ranges, number (%) and median (IQR) (Inter quartile range). Chi-square test (x2) was used to compare nonparametric variables. Comparison between groups was done using Analysis of Variance (ANOVA-One Way) as a parametric test and Kruskal Wallis Analysis of Variance by ranks as a nonparametric test. P values less than 0.05 (p0.05). Regarding the duration of globe analgesia, adding dexmedetomidine to the local anesthetic mixture prolonged the duration of globe analgesia, and this difference was statistically significant in group D25 in comparison with the control group (p>0.05). Regarding the duration of globe akinesia although there was prolongation of the duration of akinesia in all groups the difference was statistically significant only in group D25 when compared to the control group (p>0.05). The Verbal Rating Score (VRS) during surgery didn’t show any significant difference when comparing the dexmedetomidine groups (D15, D20 and D25) to the control group or when comparing the four groups to each other (p