Syncope Vasovagal syncope 2014-02-15T01:33:13Z Neurocardiogenic syncope SNOMEDCT_US:398652001 UMLS:C0340854 Situational syncope Reflex syncope A vasovagal episode or vasovagal syncope is the most common form of reflex syncope. Reflex syncope is a general term used to describe types of syncope resulting from a failure in autoregulation of blood pressure, and ultimately, in cerebral perfusion pressure resulting in transient loss of consciousness. The mechanisms responsible for this are complex and involve both depression of cardiac output as well as a decrease in vascular tone. SNOMEDCT_US:398665005 SNOMEDCT_US:234167006 HP:0012668 Vasovagal episode UMLS:C0042420