<unk>  is a condition in which there is insufficient bloodflow to the brain to meet metabolic demand. This leads to poor oxygen supply or cerebral hypoxia and thus leads to the death of brain tissue or cerebral infarction/ischemic stroke. It is a sub-type of stroke along with subarachnoid hemorrhage and intracerebral hemorrhage.<unk>  leads to alterations in brain metabolism, reduction in metabolic rates, and energy crisis. There are two types of<unk> : focal<unk> , which is confined to a specific region of the brain; and global<unk> , which encompasses wide areas of brain tissue. The main symptoms of<unk>  involve impairments in vision, body movement, and speaking. The causes of<unk>  vary from sickle cell anemia to congenital heart defects. Symptoms of<unk>  can include unconsciousness, blindness, problems with coordination, and weakness in the body. Other effects that may result from<unk>  are stroke, cardiorespiratory arrest, and irreversible brain damage. An interruption of blood flow to the brain for more than 10 seconds causes unconsciousness, and an interruption in flow for more than a few minutes generally results in irreversible brain damage. In 1974, Hossmann and Zimmermann demonstrated that<unk>  induced in mammalian brains for up to an hour can be at least partially recovered. Accordingly, this discovery raised the possibility of intervening after<unk>  before the damage becomes irreversible.
Brain ischemia
Cerebral infarction
Cerebral edema
Stroke
Brain herniation
Intracranial hemorrhage
Heat stroke
Intracerebral hemorrhage