Kang RA, Jeong JS, Chin KJ, et al. - Among patients undergoing arthroscopic shoulder surgery (n = 80), researchers investigated whether noninferior postoperative analgesia would be offered by superior trunk block vs the interscalene block and whether a reduced hemidiaphragmatic paresis would result from the superior trunk block in this patient population. Randomization of the patients was done to administer a preoperative injection of 15 ml of 0.5% ropivacaine and 5 μg · ml⁻¹ epinephrine around either the C5–C6 nerve roots (interscalene block group) or the superior trunk (superior trunk block group). The study was completed by 78 patients. At 24 h postoperatively, the superior trunk block (n = 38) group vs the interscalene block (n = 40) group had pain score of 1.4 ± 1.0 vs 1.2 ± 1.0, respectively. Findings revealed that noninferior analgesia was offered by the superior trunk block vs interscalene brachial plexus block for up to 24 h following arthroscopic shoulder surgery. In addition, significantly less hemidiaphragmatic paresis was observed in relation to the use of the superior trunk block in these patients.