Does the etiology of syncope (cardiac, unknown cause, or vasovagal) affect the risk of all-cause mortality and cardiovascular events?
The prognosis of syncope is highly dependent on its etiology, with cardiac causes carrying the highest risk for mortality and cardiovascular events.
Persons with cardiac syncope are at increased risk for death from any cause and cardiovascular events, and persons with syncope of unknown cause are at increased risk for death from any cause. Vasovagal syncope appears to have a benign prognosis.
Soteriades et al. (Wed,) studied this question.