Colorectal cancer is a common and lethal disease. It still remains the third most common cause of cancer death in women and the second leading cause of death in men. Pain control is an important direction of postoperative management in malignancy surgery. Inadequate pain control increases cardiac and respiratory complications in these critical patients. Erector spinae plane (ESP) block is a recently described regional anesthesia technique that blocks the dorsal and ventral rami of the spinal nerves and the sympathetic nerve fibers. While the ESP block has been shown to provide effective postoperative analgesia after thoracic, and abdominal surgeries.

Our aim in this study was to investigate bilateral thoracic ESP block for providing successful postoperative pain management following colorectal surgery.

Inclusion Criteria:

• American Society of Anesthesiologist's physiologic state I-II-III patients undergoing Colorectal surgery

Exclusion Criteria:

• renal or hepatic insufficiency, chronic pain, patients with an allergic reaction to anesthesia and analgesia drugs to be used