The combined spinal-epidural anesthesia (CSEA) would be performed in the lateral position at the intervertebral space between L3 and L4. Then, spinal solution will be injected intrathecalley after CSF releas. The epidural catheter will be inserted. The patient will be immediately placed in a supine position with 15° left tilt. Completion of the spinal injection would be considered as time zero. The sensory block will be determined by pinprick along both sides of the midclavicular line at 2 min intervals post injection. The sensory block had not reached T8 before surgery, or there was moderate pain during the skin incision, spinal anesthesia would be considered to have failed.