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Several investigators have described the effect of bolus injections on sensory block during combined spinal epidural anesthesia. This study investigates the effects of the immediate epidural infusion of 0.2% ropivacaine versus 0.9% saline on spinal anesthesia.Forty-four patients undergoing partial hip replacement were randomly assigned to 2 groups, receiving epidural infusion of 0.2% ropivacaine 10...