Sleep syncope: a new clinical entity or just a vasovagal syncope during wakefulness after sleep onset?

Keywords: Nocturnal syncope; Neurally mediated syncope; Gastrointestinal; Loss of consciousness EN Nocturnal syncope Neurally mediated syncope Gastrointestinal Loss of consciousness 5 6 2 03/09/22 20220201 NES 220201 Vasovagal syncope is conventionally defined as a neurally mediated reflex triggered by central hypovolemia, associated with vasodilation of arterial and venous beds and bradycardia. At the risk of being pedantic, it remains unclear whether sleep syncope is true syncope, or whether the experience is possibly better described as nocturnal syncope because the predominantly abdominal symptoms are upon wakening, and syncope can obviously only occur once conscious. [Extracted from the article]