Comparıson of Analgesıc Effıcacy of Dıfferent Volumes of Serratus Posterior Superıor Intercostal Plane Block After Modıfıed Radıcal Mastectomy Surgery

The aim of researchers is to compare the effects of three different local anesthetic concentrations and volumes on opioid consumption, postoperative analgesic efficacy, and pain scores during ultrasound-guided SPSIP blocks in patients undergoing modified radical mastectomy. Additionally, we aim to map and identify the dermatomal areas where different concentrations and volumes of SPSIP blocks provide analgesia.

Inclusion Criteria: * The study included adult patients over 18 years of age who underwent modified radical mastectomy under general anesthesia and were classified in risk groups I-II-III according to the American Society of Anesthesiologists (ASA) risk classification. Exclusion Criteria: * patients with coagulopathy, * patients with signs of infection at the block application site, * patients with ASA IV * patients with known allergies to any of the study drugs, * patients with ineffective block * patients who could not cooperate during postoperative pain assessment * patients who wanted to withdraw from the study, * patients with alcohol and drug addiction, * patients with musculoskeletal abnormalities * patients with kidney and liver failure * patients with obesity (body mass ≥ 35 kg/m2)