Breast cancer surgery is frequently associated with moderate to severe postoperative pain, which may negatively affect recovery and increase opioid consumption. Ultrasound-guided fascial plane blocks have become an important component of multimodal analgesia strategies for breast surgery.
The rhomboid intercostal-subserratus plane (RISS) block and serratus posterior superior intercostal plane (SPSIP) block are recently described regional anesthesia techniques that may provide effective postoperative analgesia by blocking the lateral and posterior branches of the thoracic spinal nerves. However, comparative clinical evidence regarding their analgesic efficacy and dermatomal coverage in modified radical mastectomy remains limited.
This prospective randomized double-blind controlled trial will compare RISS block and SPSIP block in adult patients undergoing modified radical mastectomy under general anesthesia. Participants will be randomly allocated to receive either RISS block or SPSIP block before surgery. The primary objective is to compare postoperative opioid consumption. Secondary outcomes include postoperative pain scores, dermatomal sensory spread, time to first rescue analgesia, quality of recovery, opioid-related adverse events, and block-related complications.
