Introduction: Since the 80's, clonidine has been used as an adjunct to local anesthetics agents in various regional
techniques to extend the duration of block. The results of previous studies on the usefulness of clonidine on brachial
plexus block have been mixed. To evaluate the efcacy of clonidine, as Material and Methods: an adjunct to the ropovacaine in
supraclavicular branchial plexuses on the onset and duration of sensory and motor block. Observations and Results: the onset of sensory and
motor bock is the same whether patients receive ropivacaine alone or in combination with clonidine. However duration of both sensory and motor
block is signicantly prolonged in Ropivacaine and clonidine group . Clonidine Hcl can s Conclusion: afely be used as an adjunct to local
anesthetic agent in supraclavicular brachial plexus block to enhance onset and duration of sensory and motor block and provide better
postoperative pain relief in upper limb surgeries.
Author Correction: Hemidiaphragmatic paralysis following costoclavicular versus supraclavicular brachial plexus block: a randomized controlled trial
