Prophylactic Use of Ketamine and Tramodol for the Prevention of Intra-Operative Shivering in Lower Limb Surgeries Done in Spinal Anesthesia. mfm [Internet]. 2020 Aug. 3 [cited 2026 Apr. 15];31(7). Available from: http://medicalforummonthly.com/index.php/mfm/article/view/2323