Musso D, et al. - Given that an alternative anaesthetic method for arthroscopic shoulder surgery has recently been reported that involved the combination of a superficial cervical plexus block, a suprascapular nerve block, and the lateral sagittal infraclavicular brachial plexus block (LSIB), researchers investigated whether the LSIB dose for this shoulder block could be remarkably attenuated by injecting only towards the shoulder relevant posterior and lateral cords. In 23 adult patients scheduled for hand surgery, evaluation of the minimum effective volume in 50% of the patients (MEV₅₀), as well as estimation of the MEV₉₅, was carried out when ropivacaine 7.5 mg/mL was used to block these cords. They applied logistic regression and probit transformation. The estimated MEV₉₅ of ropivacaine 7.5 mg/mL was 9.0 mL for single-deposit infraclavicular posterior and lateral cord block.