Breast cancer is the most common type of cancer in women. Mastectomy and axillary lymph node disection are commonly performed as part of the cancer management. This surgery can cause significant postoperative pain. The serratus plane block (SPB) has been described for analgesia of the hemithorax and reported for many cases such as thoracoscopy, shoulder arthroscopy, breast surgery and axillary lymph node dissections. Serratus plane block may be a viable alternative to current regional anaesthetic techniques such as thoracic paravertebral and central neuraxial blockade.

The aim of this study is to determine effectiveness of ultrasound guided superficial serratus plane block in patients undergoing modified radical mastectomy and axillary lymph node dissection surgery.

Inclusion Criteria:

• American Society of Anesthesiologist's physiologic state I-III patients undergoing Modified Radical Mastectomy and Axillary Lymph Node Disection

Exclusion Criteria:

• chronic pain, bleeding disorders, renal or hepatic insufficiency,patients on chronic non-steroidal anti-inflammatory medications