transient ischemic attack

transient ischemic attack An event that affects the central nervous system and has the signs and symptoms of a stroke but that goes away within a short period of time. Abbreviated TIA. A TIA is due to a temporary lack of adequate blood and oxygen (ischemia) to the brain. This is often caused by the narrowing (or, less often, ulceration) of the carotid arteries (the major arteries in the neck that supply blood to the brain). TIAs typically last 2 to 30 minutes and can produce problems with vision, dizziness, weakness, and trouble speaking. If a TIA is not treated, there is a high risk of a stroke in the near future, usually within 90 days. A person who even remotely suspects a TIA should seek medical attention right away. Medication and/or a procedure to clean out the carotid artery and restore normal blood flow through the artery (carotid endarterectomy) can markedly reduce the risk of a subsequent stroke. Also known as mini-stroke.