Their were significant differences between observation and control groups in intraoperative blood loss ( 5.071.14 vs 2.450.57 , P = 0.000 ) , pain ( 12 h after the surgery : 5.081.62 vs 7.192.01 , P = 0.000 ; at first dressing change : 2.640.87 vs 4.341.15 , P = 0.000 ; first defecation : 3.911.47 vs 5.631.98 , P = 0.001 ) , urine retention ( n = 22 vs n = 47 , P = 0.001 ) , anal pendant expansion after the surgery ( 2.350.56 vs 5.161.42 , P = 0.000 ) , operation time ( 18.35.6 min vs 29.58.2 min , P = 0.000 ) , and the length of hospital stay ( 5.30.6 d vs 11.41.8 d , P = 0.000 ) .