Our impact Podcasts What you may not know about strokes and how they can be prevented Podcast featuring Ronen Leker, MD, Head of the Cerebrovascular Service and The Peritz and Chantel Scheinberg Cerebrovascular Disease Research Laboratory at the Hebrew University-Hadassah Medical Center in Jerusalem. Download Podcast Stroke (also known as cerebrovascular disease) occurs when a blood vessel that carries oxygen and nutrients to the brain is either blocked by a clot or bursts. When that happens, part of the brain cannot get the blood and oxygen it needs, so it starts to die. Yet, few may realize that not only is time of the essence during a stroke, but as The American Stroke Association notes 80% of stroke cases are preventable. Getting medical care as quickly as possible can help prevent death or minimize some of the lasting effects of stroke.