Ultrasonographic examination to search out the optimal upper arm position for coracoid approach to infraclavicular brachial plexus block--a volunteer study.

Background: Infraclavicular brachial plexus block has been widely used for surgical procedures below the mid humerus owing to its excellent anesthetic quality and ease of practice. However, what is the optimal upper arm position for carrying out the procedure still lacks consensus of opinion. The primary goal of this study was to determine the optimal upper arm position for coracoid infraclavicular block by ultrasonographic examination.