title: Comparison of catecholamine response during tilt-table-induced vasovagal syncope in patients <35 to those >65 years of age.
abstract: This study compared alterations in arterial catecholamine concentrations associated with tilt-induced vasovagal syncope that differed in older (>65 years) and younger patients (<35 years). Older patients with tilt-positive tests tended to exhibit higher baseline epinephrine (E) concentrations and lesser E surge before development of syncope than younger patients (<35 years), whereas both groups manifested comparable norepinephrine (NE) responsiveness.
authors.affiliation: Cardiac Arrhythmia Center, Department of Medicine, Cardiovascular Division, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA
authors.forename: Cengiz
authors.initials: C
authors.lastname: Ermis
authors.forename: Nemer
authors.initials: N
authors.lastname: Samniah
authors.forename: Scott
authors.initials: S
authors.lastname: Sakaguchi
authors.forename: Keith G
authors.initials: KG
authors.lastname: Lurie
authors.forename: Scott
authors.initials: S
authors.lastname: Pham
authors.forename: Fei
authors.initials: F
authors.lastname: Lu
authors.forename: David G
authors.initials: DG
authors.lastname: Benditt
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D004837:Epinephrine / Q000097:blood*; D006801:Humans; D009638:Norepinephrine / Q000097:blood*; D011187:Posture / Q000502:physiology; D019462:Syncope, Vasovagal / Q000097:blood* / Q000503:physiopathology; D018667:Tilt-Table Test
chemical_list: D009638:Norepinephrine; D004837:Epinephrine