Comparison of Mean Duration of Analgesia Following the Administration of Bupivacaine With and Without Magnesium Sulphate in Ultrasound Guided Erector Spinae Plane Block in Modified Radical Mastectomy Patients

Inclusion Criteria: * Female patients having ASA 1 and Il being aged 2 5 - 60 years and undergoing one sided breast cancer surgery \* Patients who sign written informed consent to participate in the study. Exclusion Criteria: * Patients having contraindications for regional blocks (c.g., infection a t the injection site, coagulopathy), allergy to the drugs used i n the study Patients who received radiotherapy, and patients need axillary dissection • Patients with known hypersensitivity to local anesthetic drug (Bupivacaine). Patients with coagulation disorders or receiving anti-coagulant therapy (INR\>2.0).