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Pathophysiological Mechanisms Underlying Vasovagal Syncope in Young Subjects
Author(s) -
WIELING WOUTER,
SMIT ADRIANUS A.J.,
C.E CATHERINE,
STEENWIJK DE JONGDE VOS,
J JOHANNNES,
LIESHOUT VAN,
KAREMAKER JOHN M.
Publication year - 1997
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1997.tb03622.x
Subject(s) - fainting , vasovagal syncope , medicine , hemodynamics , cardiology , vasomotor , pathophysiology , vascular resistance , mechanism (biology) , syncope (phonology) , anesthesia , philosophy , epistemology
The occurrence of vasovagal fainting is common in young subjects, but the origin of the precipitating hemodynamic mechanisms involved remain a subject of considerable speculation. Vasovagal fainting is not a sudden onset phenomenon, early failure of vascular resistance responses occurs in faint‐prone young subjects. The variability of hemodynamic responses during the actual faint is large, but the main mechanism operative during, is withdrawal of sympathetic outflow to blood vessels in skeletal muscle with impairment of ability to maintain vasomotor tone.