Abdul Waheed, Shahneela Raza, Muhammad Saleh, Hamza Ashraf Zia, Babar Jan, Hafiz Muhammad Umair 2023. The Effect of Ketamine Versus Tramadol on Prophylactic Post-Spinal Shivering in Those Patients Undergoing Orthopedic Surgery. Pakistan Journal of Medical & Health Sciences. 17, 01 (Mar. 2023), 648. DOI:https://doi.org/10.53350/pjmhs2023171648.