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Background and Aims INTRODUCTION: Lateralized spinal anesthesia is based on the difference in density of the anesthetic solutions compared to the CSF which defines their baricity. OBJECTIVE: The aim of our study is to evaluate the anesthetic technique of unilateral spinal anesthesia in an outpatient setting. Namely the time of appearance of the block, the success rate, the recovery profile of spinal anesthesia as well as the hemodynamic state. For this we used levobupivacaine at 0.5% hypobaric as a drug.

Methods MATERIALS AND METHODS: We conducted a prospective randomized study, including 44 patients proposed for orthopedic surgery since January 2016. They were divided into three groups: Group A: a series of 13 patients received 8 mg of 0.5% hypobaric levobupivacaine intrathecally 2.5 sufentanyl. Group B: a series of 17 patients received 10 mg of levobupivacaine 0.5% hypobaric intrathecally 2.5 sufentanyl. Group C: a series of 14 patients received 12 mg of levobupivacaine 0.5% hypobaric 2.5 sufentanyl.

Results RESULTS: In table n°1 and n°2 summarizes the demographic data, 44 patients were included, the patients were comparable for age, sex, ASA score and BMI. The type of surgery was noted as well as the duration of the intervention. Note when there were no cases of transient radicular irritation syndrome, No bladder globus or post-spinal headache in our series.

Conclusions CONCLUSION: Unilateral spinal anesthesia is of great interest for ambulatory practice: reliability, simplicity, less toxicity, compared to multiple blocks, associated with rapid recovery of fitness for the street, particularly due to early ambulation.