Importance of study design in assessing early postoperative benefits of nerve blocks. Comment on Br J Anaesth 2021; 127: 629–35

Editor—The recent study by Canitez and colleagues1 assessed the effect of erector spinae plane block (ESPB) on the quality of recovery after laparoscopic cholecystectomy, but there are several issues in methodology and results that deserve further clarification and discussion.