The attacks are caused by any temporary lack of cardiac output caused by a transient abnormal heart rhythm. Paroxysmal supraventricular tachycardia or atrial fibrillation has been reported as the underlying cause in up to 5% of patients in one series. The resulting lack of blood flow to the brain is responsible for the loss of consciousness and associated fainting episode.
Adams–Stokes syndrome
Hopkins syndrome
SUNCT syndrome
Michels Caskey syndrome
PHACE syndrome
Hennekam syndrome
Dressler syndrome
Wunderlich syndrome