Musso D, et al. - Considering the recent observation that the novel combination of a superficial cervical plexus block, a suprascapular nerve block, and the lateral sagittal infraclavicular brachial plexus block (LSIB) provides an alternative anaesthetic method for arthroscopic shoulder surgery, researchers investigated the minimum effective volume in 50% of the patients (MEV₅₀) and estimated the MEV₉₅, when using ropivacaine 7.5 mg/mL to block these cords. They hypothesized that for this shoulder block, the LSIB dose could be markedly reduced by injecting only towards the shoulder relevant posterior and lateral cords. Considering the artery as a clock face with 12 o'clock ventral, they injected the designated volume immediately outside the arterial wall and between 8 and 9 o´clock in 23 adult patients scheduled for hand surgery. In this work, the MEV₉₅ of ropivacaine 7.5 mg/mL was estimated to 9.0 mL for single-deposit infraclavicular posterior and lateral cord block.