@ min before anesthesia induction , bilateral Neiguan ( PC @ ) , Neimadian , Hegu ( LI @ ) , Yangxi ( LI @ ) , Zhongji ( CV @ ) , Qichong ( ST @ ) , Zuwuli ( LR @ ) were selected and punctured in the treatment group , and elecctroacupuncture was given after arrival of qi until @ min after the wake-up from anesthesia and withdrawal of endotracheal tube .