The prognosis for patients presenting with syncope varies according to the underlying etiology. One populationbased study found that cardiac and neurologic syncope were associated with an increased risk of death from any cause and an increased risk of cardiovascular events and stroke, respectively [15]. By comparison, patients with vasovagal, orthostatic, medication-induced and situational syncope had no increase in the risk of death from any cause compared with patients without syncope [15]. Although laugh syncope was not specifically addressed in this study, as a type of situational syncope, we extrapolate that its prognosis is likely benign. To the best of our knowledge, no study to date has investigated the prognosis
of laugh syncope.