AMERICAN JOURNAL OF CARDIOLOGY, cilt.93, sa.2, ss.225-227, 2004 (SCI-Expanded)
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. (C) 2004 by Excerpta Medica, Inc.