What medical event is known as a cerebrovascular accident (CVA) caused by a lack of oxygen to the brain?

A cerebrovascular accident (CVA), commonly known as a stroke, occurs when there is a sudden disruption of blood flow to the brain, resulting in a lack of oxygen. This can lead to brain cells dying and can cause various neurological deficits. Strokes can be ischemic, caused by a blockage in a blood vessel, or hemorrhagic, caused by bleeding in the brain. The key aspect of a stroke is that it is a direct medical event linked specifically to oxygen deprivation in the brain due to interrupted blood flow.

The other options refer to medical events that affect the brain but do not specifically denote the interruption of blood flow leading to oxygen deprivation in the same way that a stroke does. Seizures are electrical disturbances in the brain's activity, transient ischemic attacks (TIAs) are often considered "mini-strokes" that resolve quickly without permanent damage, and hemorrhages refer to excessive bleeding not necessarily linked to a sudden oxygen deprivation event like a stroke. Thus, stroke is the term that most accurately defines a cerebrovascular accident caused by a lack of oxygen to the brain.