occurs either due to decrease blood supply to brain ,which can be arterial or venous ,it can also occurs when artery
rupture which we call hemorhagic stroke.A stroke occurs when there is interruption of the blood supply to a particular area of the brain, ultimately leading to cell injury
and cell death
Ischemic strokes are the most common, accounting for up to 80% of stokes, and occur when there is an occlusion of a blood vessel impairing the flow of blood to the brain. Ischemic strokes are divided into:
[A] thrombotic, [B] embolic, [C] systemic hypoprofusion.