Efficacy of Serratus Anterior Plane Block With Dexmedetomidine During Breast Surgery

This study is testing whether adding dexmedetomidine (a sedative medication) to a serratus anterior plane block — a targeted nerve block injection in the chest wall — can improve pain control after modified radical mastectomy (breast removal surgery for cancer). **You may be eligible if...** - You are scheduled to have a modified radical mastectomy - You are between 18 and 65 years old - You are classified as ASA I or II (generally healthy or with mild medical conditions) **You may NOT be eligible if...** - You refuse the procedure - You have a blood clotting disorder - You have abnormal kidney or liver function - You have a local infection at the injection site Talk to your doctor to see if this trial is right for you.