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.
Original language | English (US) |
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Pages (from-to) | 225-227 |
Number of pages | 3 |
Journal | American Journal of Cardiology |
Volume | 93 |
Issue number | 2 |
DOIs | |
State | Published - Jan 15 2004 |