For the prior-to-catheter group , one week before the removal of catheter , acupoints on the abdomen and back such as Guanyuan ( CV @ ) , Zhongji ( CV @ ) , Baliao ( Shangliao ( BL @ ) , Ciliao ( BL @ ) , Zhongliao ( BL @ ) , Xialiao ( BL @ ) , Jiaji ( EX-B @ ) and acupoints at distal end such as Zusanli ( ST @ ) and Sanyinjiao ( SP @ ) were selected ; after the catheter removal , simple method .