Author/Authors :
Ermis، نويسنده , , Cengiz and Samniah، نويسنده , , Nemer and Sakaguchi، نويسنده , , Scott and Lurie، نويسنده , , Keith G. and Pham، نويسنده , , Scott and Lu، نويسنده , , Fei and Benditt، نويسنده , , David G.، نويسنده ,
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.
