Comparison of Efficacy of Levobupivacaine 0.375% and Levobupivacaine 0.25% along with a Fixed Dose of Dexmedetomidine for Ultrasound-guided Supraclavicular Brachial Plexus Block

IntroductIonThe use of regional blocks [regional anesthesia (RA)] in contemporary anesthetic practice has grown significantly.RA is the recommended approach for upper limb surgeries on cooperative patients. 1,2 For upper limb surgery, the brachial plexus block (BPB) provides dependable and flexible RA. 3 The procedure most frequently performed in the world is the supraclavicular brachial plexus block (SBPB), which is less likely to cause complications since it can be done in real time with the use of ultrasound (USG)-guided SBPB.BPB employs a range of medications, including long-acting bupivacaine and short-acting lignocaine. 3,4 Levobupivacaine is the S (-) enantiomer of bupivacaine and a long-acting amide local anesthetic.It causes fewer cardiovascular adverse effects and less motor nerve fiber penetration than bupivacaine. 5 The effect of a single-dose brachial block generally wanes off just after surgery, leaving the surgical site prone to moderate to severe postoperative pain.Additionally, the limited therapeutic window of local anesthetic medications restricts the 1,