Is the serratus posterior superior intercostal plane block a viable alternative to the erector spinae plane block for postoperative analgesia in breast surgery? A prospective, randomized trial

The SPSIPB may provide postoperative analgesia that is comparable in efficacy to the ESPB technique in breast surgery. Based on the findings of this study, SPSIPB provided postoperative analgesia comparable to ESPB and was associated with lower opioid consumption within the first 24 h after surgery. Furthermore, the ESPB group experienced pain relief earlier after surgery compared to the SPSIPB group, while pain relief in the SPSIPB group occurred later and lasted longer.