Background: Unilateral spinal anaesthesia is an ideal unsensible method for spathe twistled yowl and elderly patients who have high risk of anesthetic recovery. The goal of this study is to assess hyperbaric bupivacaine and the time which the patients have been kept in lateral positions during the unilateral spinal anaesthesia. Methods: A prospective, randomized and controlled study was conducted on 164 adult, age: 15-65 patients of ASA 1,2 undergoing surgery in the lower extremity. Patients were anesthesied at L4-L5 positions, middle lines at the lateral position and divided into 4 groups (n = 41). Group I: 6mg of 0.5 percent hyperbaric bupivacaine solution. Groop II: Patients were kept in lateral positions after spinal anaesthesia for 10 minutes. Group a: Patients were kept in lateral positions after spinal anaesthesia for 5 minutes. Group b: Patients were kept in lateral positions after spinal anaesthesia for 10 minutes. Spinal block was assessed by prinprick and modified Bromage scale, side effects were also evaluated and compared among the groups. Results: The rate of unilateral and sensable block (surgery position) at group I and group b has been higher than group II and group a, which has statistical meaning. Conclusions: For unilateral spinal anaesthesia in lower extremity operations, 8mg 0.5 percent hyperbaric bupivacaine solution for operations above the knee and 6mg 0.5 percent hyperbaric bupivacaine solution for operations below the knee and keeping the patinets for 10 min in the lateral decubitus position were found to be appropriate.
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