Patients will be randomly allocated to three different postoperative strategies : postoperative patient-controlled intravenous analgesia with morphine ( control group , n = @ ) , a transversus abdominis plane block with ropivacaine @ % at the end of surgery plus postoperative patient-controlled intravenous analgesia with morphine ( TAP group , n = @ ) , or perioperative intravenous lidocaine plus postoperative patient-controlled intravenous analgesia with morphine ( LIDO group , n = @ ) .