The participants were randomly divided into the study and control groups. No oral premedication was administered. All the patients were asked to empty their urinary bladders before arrival to the operating theatre. When the standard monitoring (continuous electrocardiogram, noninvasive blood pressure, pulse oximetry) was started, intravenous premedication with midazolam was administered and lumbar spinal anesthesia with hyperbaric 0.5% solution of bupivacaine hydrochloride was performed.