SYNCOPE

摘要: Syncope (Greek, synkope , meaning cessation, pause) is a transient loss of consciousness and postural tone with spontaneous recovery no neurologic sequelae. caused by global reversible reduction blood flow to the reticular activating system, neuronal network in brain stem responsible for supporting consciousness. most frequently occurs while standing because vertical position pressure are exquisitely dependent on normal functioning cardiovascular system. Thus, abnormalities cardiac output or autonomic reflexes controlling can cause syncope standing. The common orthostatic orthos straight; statikos causing stand) hypotension an acute dysfunction (i.e., neurally mediated syncope). It important keep mind, however, that may also occur without systemic when hypocapnia-induced diffuse cerebral vasoconstriction results flow. Finally, enclosed nondistensible cranium, maneuvers raise intracranial reduce drastically inducing symptoms ischemia including syncope. often, at least once 3% men 3.5% women. 76 causes numerous. Further complicating differential diagnosis other consciousness, such as seizures metabolic psychiatric disorders, which simulate This article reviews neuroendocrine mechanisms involved maintaining position, syncope, its diagnosis, treatment.