title: Endogenous opioids, catecholamines and vasovagal syncope.
authors.forename: H E
authors.initials: HE
authors.lastname: Kulbertus
mesh_terms: D002395:Catecholamines / Q000502:physiology*; D018847:Opioid Peptides / Q000502:physiology*; D019462:Syncope, Vasovagal / Q000209:etiology*
chemical_list: D002395:Catecholamines; D018847:Opioid Peptides