To compare the effect of ketamine versus dexmedetomidine spray at the surgical site during closure in lumbar spine fixation surgery for postoperative pain relief: Prospective, randomized, double-blinded, placebo-controlled study. - Annamalaei; Singh, Atul Kumar; Singh, Yashpal; Manjhi, Birju; Pandey, Arun Raj; Gupta, Bikram Kumar (International Journal of Critical Illness & Injury Science, 2026)