This usually arises from a dislodged atherosclerotic plaque in one of the carotid arteries ("i.e. " two of the four major arteries supplying the brain) or from a thrombus ("i.e." a blood clot) in the heart because of atrial fibrillation.
This usually arises from a dislodged atherosclerotic plaque in one of the carotid arteries ("i.e. " two of the four major arteries supplying the brain) or from the vertebral-basilar arteries. Another common cause is from a thrombus ("i.e." a blood clot) that has originated from the (usually left) atrium of the heart due to atrial fibrillation.