NCIt definition : A spontaneous loss of consciousness caused by insufficient blood supply to the brain.;
Alternative definition : NICHD: Transitory loss of consciousness and postural tone.; CTCAE: A disorder characterized by spontaneous loss of consciousness caused by insufficient
blood supply to the brain.; ACC/AHA: Sudden loss of consciousness with loss of postural tone, not related to anesthesia
with spontaneous recovery as reported by patient or observer. Patient may experience
syncope when supine.; FDA: A spontaneous, transient, loss of consciousness caused by insufficient blood
supply to the brain.; ACC/AHA: Abrupt, transient, complete loss of consciousness, associated with inability
to maintain postural tone, with rapid and spontaneous recovery.;