RESULTS : Omission of fentanyl did not reduce the overall incidence of postoperative nausea and vomiting , but did reduce the incidence of vomiting and/or moderate to severe nausea prior to discharge from 20 % and 17 % with fentanyl and fentanyl-dexamethasone , respectively , to 5 % ( P = 0.013 ) .
O O O O B-ChemicalEntity O O O O O O O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O O O O O O O B-DiseaseOrPhenotypicFeature O O O O B-DiseaseOrPhenotypicFeature O O O O O O O O O O B-ChemicalEntity O I-ChemicalEntity O O O O O O O O O O O O