Does low-volume inter-scalene block attenuate the severity of diaphragmatic paresis?

Editor—I commend Riazi and colleagues¹ on their importantstudy demonstrating that the analgesic effect of an interscalenebrachial plexus block (ISBPB) may be achieved with an extremelylow volume (5 ml) of local anaesthetic, while simultaneouslyreducing the incidence of phrenic nerve palsy (from 100% to