CONCLUSIONS : Methadone is associated with QT prolongation and higher reporting of syncope in a population of heroin addicts .
O O B-ChemicalEntity O O O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O O O O B-DiseaseOrPhenotypicFeature O O O O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O