Recurrent sudden attacks of unconsciousness caused by impaired conduction of the impulse that regulates the heartbeat WordNet 3.0 & Open English WordNet

Stokes–Adams syndrome, Adams–Stokes syndrome or Gerbec–Morgagni–Adams–Stokes syndrome is a periodic fainting spell in which there is intermittent complete heart block or other high-grade arrhythmia that results in loss of spontaneous circulation and inadequate blood flow to the brain. Wikipedia

Atrioventricular block is a type of heart block that occurs when the electrical signal traveling from the atria, or the upper chambers of the heart, to ventricles, or the lower chambers of the heart, is impaired. Wikipedia

Heart block is a disorder in the heart's rhythm due to a fault in the natural pacemaker. Wikipedia

A heart disease Wikipedia Disambiguation

Cardiovascular system disease that involves the heart's electrical conduction system Wikipedia Disambiguation

Periodic fainting spell in which there is a periodic onset and offset of blockage of heart due to disorder of heart rhythm Wikidata

Heart conduction disease that is characterized by the impairment of the conduction between the atria and ventricles of the heart Wikidata

A condition characterized by periodic fainting spells in which there is intermittent complete heart block or other high-grade arrhythmia that results in loss of spontaneous circulation and inadequate blood flow to the brain. Wiktionary

A disease in the electrical system of the heart, opposed to coronary artery disease, which is disease of the blood vessels of the heart. Wiktionary