Abstract PR490: Comparison of the Efficacy And Safety of Dexmedetomidine Versus Clonidine in Combination with Bupivacaine During Spinal Anesthesia for Hip Surgery. (September 2016) - Hamdi, M.; Boughariou, S.; Zbidi, B.; Zakhama, S.; Sfeyhi, N.; Boussofara, M.