Effect on Onset and Duration of Sensory and Motor Block with Single Bolus Dose of Intravenous Dexmedetomidine as an Adjuvant on Spinal Anesthesia with 0.5% Hyperbaric Bupivacaine in Lower Limb Surgery. J Nobel Med Coll. 2023;12(2):109-114. doi:10.3126/jonmc.v12i2.61518