[Comparison of the block characteristics of levobupivacaine vs bupivacaine for unilateral spinal block].

Objective: To compare the block characteristics of levobupivacaine and bupivacaine for hypobaric unilateral spinal block.

Methods: Sixty patients undergoing hypobaric unilateral spinal block for lower extremity operations were randomized into 2 equal groups. In one group the patients were asked to lie on the uncompromised side for slow injection of hypobaric bupivacaine solution (0.