Comparison of catecholamine response during tilt-table-induced vasovagal syncope in patients <35 to those >65 years of age.
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.
Ermis
Cengiz
C
Cardiac Arrhythmia Center, Department of Medicine, Cardiovascular Division, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA
Samniah
Nemer
N
Sakaguchi
Scott
S
Lurie
Keith G
KG
Pham
Scott
S
Lu
Fei
F
Benditt
David G
DG
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
D009638:Norepinephrine; D004837:Epinephrine