Fentanyl and Dexmedetomidine with Bupivacaine in Spinal Block for Post Operative Analgesia in lower limb Orthopaedic Surgery : A comparative study. AJPHS. 2016;6(2):1453-1460. Accessed February 27, 2026. https://www.ajphs.com/index.php/ajphs/article/view/375