Which of the following cardiovascular diseases or conditions may result in syncope?

Question

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Syncope (loss of consciousness) may result from electrical or mechanical causes, neurological or psychological causes, and autonomic diseases. Electrical causes of cardiac syncope include heart blocks and arrhythmias-when the heart beats either too slow or too fast, inadequate blood may flow to the brain and a person may lose consciousness. Mechanical causes of cardiac syncope include aortic stenosis (inadequate blood may leave the ventricle through the obstructed valve to perfuse the brain) and aortic dissection (massive internal hemorrhage may deprive the brain of adequate blood flow).

Which of the Following Cardiovascular Diseases or Conditions May Result