Classification The broad term, "stroke" can be divided into three categories: brain ischemia, subarachnoid hemorrhage and intracerebral hemorrhage. Brain ischemia can be further subdivided, by<unk> , into thrombotic, embolic, and hypoperfusion. Thrombotic and embolic are generally focal or multifocal in nature while hypoperfusion affects the brain globally. Focal brain ischemia Focal brain ischemia occurs when a blood clot has occluded a cerebral vessel. Focal brain ischemia reduces blood flow to a specific brain region, increasing the risk of cell death to that particular area. It can be either<unk> d by thrombosis or embolism. Global brain ischemia Global brain ischemia occurs when blood flow to the brain is halted or drastically reduced. This is commonly<unk> d 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, brain damage may be permanent. While reperfusion may be essential to protecting as much brain 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 ischemic tissue. Due to different susceptibility to ischemia of various brain regions, a global brain ischemia may<unk>  focal brain infarction. The cerebral cortex and striatum are more susceptible than the thalamus, and the thalamus in turn is more sensitive than the brainstem. Partial cerebral cortex infarction from global brain ischemia typically manifests as watershed stroke.
medical cause of Stroke
complications of Stroke
medical cause of Subarachnoid hemorrhage
medical cause of Lightheadedness
symptom of Intracerebral hemorrhage
symptom of Stroke
medical cause of Intracerebral hemorrhage
symptom of Intracranial aneurysm