One hundred and sixty patients undergoing laparoscopic surgery were randomly assigned to one of four groups : ( @ ) group P ( placebo-control ) : intravenous normal saline + bilateral non-acupuncture point injection of vitamin B@ ( n = @ ) ; ( @ ) group O ( ondansetron ) : intravenous ondansetron + bilateral ST@ sham injection ( n = @ ) ; ( @ ) group A ( acupuncture point injection ) : intravenous normal saline + bilateral acupuncture point injection at ST@ of vitamin B@ ( n = @ ) ; ( @ ) group C ( combination ) : intravenous ondansetron + bilateral acupuncture point injection at ST@ of vitamin B@ ( n = @ ) .