A blood clot, or embolus, can form and break-off from the heart. The clot travels through the bloodstream where it can lodge in an artery of the brain, blocking the flow of oxygen-rich blood. The lack of oxygen results in damage, destruction, or even tissue death of the brain beyond the affected area. The result is a stroke.
Reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.