Comparative Study between the Effect of Perineural versus Intravascular Dexmedetomidine in Ultrasound-Guided Supraclavicular Brachial Plexus Block

Background: Augmentation of postoperative analgesia with various adjuvants has become a standard in regional anesthesia. There are no studies about dexmedetomidine multiple approaches in supraclavicular brachial plexus block (BPB) was contrasted. We compare perineural dexmedetomidine and intravenous dexmedetomidine Bupivacaine as adjuvant in supraclavicular brachial plexus block.

Materials and Methods: This prospective randomized controlled double-blind study was conducted on 120 patients with age between 20 and 60 years, both sexes, scheduled for elective upper limb surgery. Patients were randomly allocated into 3 groups, 40 patients in each received plain bupivacaine 0.5% (20 ml) in supraclavicular BPB; group I (Control group): add 1 mL normal saline perineural, group II: Bupivacaine with perineural dexmedetomidine (BDP) add 1 μg.kg-1dexmedetomidine perineurally. group III: Bupivacaine with intravenous dexmedetomidine (BDV) add 0.5 μg.kg-1 dexmedetomidine in 50 mL of normal saline administered as infusion over 10 min. Onset and duration of sensory and motor blocks, hemodynamic variables, adverse effects, and duration of analgesia were assessed.

Results: Heart rate and mean arterial pressure was significantly decrease in group III &group II compared to group I were compared by ANOVA (F) test. onset of sensory &motor block was statistically significant shorter in group II compared to group I & III. Duration of sensory &motor block was statistically significant longer in group II compared to group I & III. there was statistically significant decrease VAS in group II were analysed using Kruskal-Wallis test between three groups. There was statistically significant increase RSS in group II & III. The first time of analgesic request was statistically significant prolonged in duration in group II.

Conclusion: Perineural dexmedetomidine (1 µg/ kg) as an adjuvant to bupivacaine is significantly high thanIV dexmedetomidine (0.5 µg/ kg) and bupivacaine alone in supraclavicular BPB as regards to the onset and the duration of sensory block, so Increasingpostoperative analgesia.