Recently a close friend has experienced two TIAs, Transient Ischemic Attacks. While not as serious as a stroke a TIA is considered a warning sign of stroke. Although it only lasts a few minutes and the symptoms are mild, most people who have a TIA are likely to suffer a full blown stroke within the next year if left unattended.
Monitoring your heart and the cardiovascular system for blockages naturally includes keeping arteries running to your brain clear and healthy. If they are towing debris that causes blood flow to diminish and nutrients are cut off to a part of the brain, you are likely to experience a TIA or worse, a stroke.