a comparative study of the effect of adding dexmedetomidine, dexamethasone and sodium bicarbonate to ropivacaine in ultrasound guided supraclavicular block on the quality of the block in orthopedic surgery

Background: brachial plexus block, particularly the supraclavicular approach. the choice of local anesthetic and the addition of adjuvants can significantly impact the quality and duration of the block. this study aimed to compare the effects of three different additives dexmedetomidine, dexamethasone, and sodium bicarbonate when combined with ropivacaine in ultrasound-guided supraclavicular blocks.methods: a double-blind randomized clinical trial was conducted with 103 patients undergoing upper limb orthopedic surgery. patients were divided into four groups, and each group received one of the following combinations: ropivacaine with dexmedetomidine, ropivacaine with dexamethasone, ropivacaine with sodium bicarbonate, or ropivacaine alone (control). the onset and duration of motor and sensory blocks, complications, patient and surgeon satisfaction, and vital signs were assessed.results: the study revealed that all additives, particularly dexmedetomidine, significantly influenced the onset and duration of motor and sensory blocks compared to the control group. dexmedetomidine demonstrated the fastest onset and prolonged the block, while dexamethasone and sodium bicarbonate also had substantial effects. importantly, the additives did not lead to an increase in complications, and patient and surgeon satisfaction remained consistent across all groups.conclusion: the findings of this study suggest that dexmedetomidine is a promising adjuvant for enhancing the quality and duration of supraclavicular blocks.