ED50 of Dexmedetomidine as an Adjuvant to 0.5% Hyperbaric Bupivacaine 12.5 mg for Spinal Anesthesia in Hip and Knee Surgery: An Up-and-Down Method Approach

Patient received spinal injection of dexmedetomidine 3 mcg.

Patient received spinal injection of dexmedetomidine 4 mcg.

Patient received spinal injection of dexmedetomidine 5 mcg.

Patient received spinal injection of dexmedetomidine 6 mcg.

Patient received spinal injection of Bupivacain hyperbaric 0.5% 12.5 mg