Ultrasound-guided deep versus superficial continuous serratus anterior plane block for pain management in patients with multiple rib fractures: A prospective randomized double-blind clinical trial.

Background: Efficient analgesia is the cornerstone in multiple rib fractures (MRFs) management. The serratus anterior plane block (SAPB) shows promising outcomes. However, it is still provocative whether the superficial or deep approach is more effective in the SAPB procedure.