Classification The broad term, "stroke" can be divided into three categories:<unk> , subarachnoid hemorrhage and intracerebral hemorrhage.<unk>  can be further subdivided, by cause, into thrombotic, embolic, and hypoperfusion. Thrombotic and embolic are generally focal or multifocal in nature while hypoperfusion affects the<unk>  globally. Focal<unk>  Focal<unk>  occurs when a blood clot has occluded a cerebral vessel. Focal<unk>  reduces blood flow to a specific<unk>  region, increasing the risk of cell death to that particular area. It can be either caused by thrombosis or embolism. Global<unk>  Global<unk>  occurs when blood flow to the<unk>  is halted or drastically reduced. This is commonly caused by cardiac arrest. If sufficient circulation is restored within a short period of time, symptoms may be transient. However, if a significant amount of time passes before restoration,<unk>  damage may be permanent. While reperfusion may be essential to protecting as much<unk>  tissue as possible, it may also lead to reperfusion injury. Reperfusion injury is classified as the damage that ensues after restoration of blood supply to<unk>  tissue. Due to different susceptibility to<unk>  of various<unk>  regions, a global<unk>  may cause focal<unk>  infarction. The cerebral cortex and striatum are more susceptible than the thalamus, and the thalamus in turn is more sensitive than the<unk> stem. Partial cerebral cortex infarction from global<unk>  typically manifests as watershed stroke.
Brain ischemia
Cerebral infarction
Cerebral edema
Stroke
Brain herniation
Intracranial hemorrhage
Heat stroke
Intracerebral hemorrhage