ELANDA RAHMAT ARIFYANTO; ARDANA TRI ARIANTO; HERI DWI PURNOMO. Opioid-Sparing Anesthesia: The Dual Efficacy of Ketamine on Postoperative Pain and Systemic Inflammation Following Spinal Surgery. Journal of Anesthesiology and Clinical Research, v. 6, n. 2, p. 986-999, 1 Oct. 2025.