This study aims to evaluate the effect of serratus posterior superior intercostal plane (SPSIP) block on postoperative pain, opioid consumption, and analgesic requirements in patients undergoing mastectomy and axillary lymph node dissection
Female patients aged 18-65 years
ASA physical status I-III
Scheduled for elective unilateral mastectomy with axillary lymph node dissection under general anesthesia
Able to understand and use the Numeric Rating Scale (NRS) for pain assessment
Known allergy or hypersensitivity to local anesthetics (e.g., bupivacaine)
Coagulopathy, thrombocytopenia (<100,000/mm³), or ongoing anticoagulant/antiplatelet therapy that cannot be discontinued
Infection or skin lesion at the injection site
Planned bilateral surgery or additional major surgical procedures