Results: excellent anesthesia level was 92.9%; sensory block onset at T12 level was 6.8 ± 2.8 min; analgesia duration was 304.9 ± 56.4 min; the rate of satisfied cases 100%; motor block onset at M1 level was 11.1 ± 5.4 min; motor block duration was 251.8 ± 51.1min; the rates of very satisfied and satisfied surgeons were 26.2% and 73.8%, respectively.