METHODS	87 patients scheduled for Le Fort I osteotomy and bilateral sagittal split ramus osteotomy ( BSSRO ) and genioplasty were randomly divided into 2 groups : experiment roup ( n = 43 ) given with Yunnan Baiyao capsules orally 4 days before operation once daily and then via nasal feeding tube after operation once a day for 5 days , and placebo group given with placebo capsules .\