Syncope
A temporary, insufficient blood supply to the brain which causes a loss of consciousness. Usually caused by a serious arrhythmia.
Cardiac
Supra Aortic Stenosis
Narrowing above the aortic valve. This results from narrowing of the aorta just above the valve.
Subarachnoid hemorrhage
Bleeding from a blood vessel on the surface of the brain into the space between the brain and the skull.