CT Stroke - Video Lesson

Hey everybody, welcome back. This lesson is about stroke as seen in CT imaging of the brain. We'll start with a general definition. A stroke refers to a sudden interruption in the blood flow to the brain, resulting in neurological deficits. For our purposes, strokes can be divided into two pathological mechanisms. There are ischemic strokes, which account for about eighty seven percent of all strokes. There are also hemorrhagic strokes, which account for about thirteen percent of all strokes. Both ischemic strokes and hemorrhagic strokes can be demonstrated in CT imaging. We'll start with ischemic strokes. Ischemic stroke is a sudden episode of neurological deficits caused by a focal disruption in blood flow to the brain as a result of embolism, thrombosis, or dissection. In other words, an ischemic stroke is caused when a blood vessel in the brain is blocked, and that area of the brain is not receiving oxygenated blood. That blockage