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Loss of consciousness and postural tone caused by diminished cerebral blood flow. [G. synkope, a cutting short, a swoon]

- Adams-Stokes s. s. due to complete AV block. SYN: Morgagni-Adams-Stokes s..

- cardiac s. fainting with unconsciousness of any cardiac cause.

- carotid sinus s. s. resulting from overactivity of the carotid sinus; attacks may be spontaneous or produced by pressure on a sensitive carotid sinus.

- deglutition s. faintness or unconsciousness upon swallowing. This is nearly always due to excessive vagal effect on a heart that may already have bradycardia or atrioventricular block. SYN: swallow s..

- hysterical s. fainting due to, or to avoid, emotional stress.

- laryngeal s. a paroxysmal neurosis characterized by attacks of coughing, with unusual sensations, as of tickling, in the throat, followed by a brief period of unconsciousness.

- local s. limited numbness in a part, especially of the fingers; one of the symptoms, usually associated with local asphyxia, of Raynaud disease.

- micturition s. s. occurring in association with the act of emptying the bladder.

- Morgagni-Adams-Stokes s. SYN: Adams-Stokes s..

- postural s. s. upon assuming an upright position; caused by failure of normal vasoconstrictive mechanisms.

- swallow s. SYN: deglutition s..

- tussive s. fainting as a result of a coughing spell, caused by persistent increased intrathoracic pressure diminishing venous return to the heart, thus lowering cardiac output; most often occurs in heavy-set male smokers who have chronic bronchitis. SYN: Charcot vertigo, laryngeal vertigo.

- vasodepressor s. faintness or loss of consciousness due to reflex reduction in blood pressure. SYN: vasovagal s..

- vasovagal s. SYN: vasodepressor s..

syn·co·pe 'siŋ-kə-pē, 'sin- n loss of consciousness resulting from insufficient blood flow to the brain: FAINT

loss of consciousness induced by a temporarily insufficient flow of blood to the brain. It commonly occurs in otherwise healthy people and may be caused by an emotional shock, by standing for prolonged periods, or by injury and profuse bleeding. An attack comes on gradually, with lightheadedness, sweating, and blurred vision. Recovery is normally prompt and without any persisting ill-effects.