As soon as the brain is deprived of nutrient- and oxygen-rich blood, brain neurons die. The longer the tissue is starved, the more damage is done. Neurons stop sending and receiving messages to and from parts of the body and faculties begin to falter. Symptoms can last minutes, hours or days and the effect can be large, small, temporary or permanent. About 85% of cerebrovascular accidents are caused by ischemic strokes.
Transient ischemic attacks or TIAs are referred to as mini ischemic strokes because their symptoms are temporary and typically last less than 24 hours. People who have mini TIAs are prone to a full-on stroke in the future.