(undetermined stroke) An acute episode of focal or global neurological dysfunction caused by presumed brain, spinal cord, or retinal vascular injury as a result of hemorrhage or infarction but with insufficient information to allow categorization as ischemic or hemorrhagic.

A group of pathological conditions characterized by sudden, non-convulsive loss of neurological function due to BRAIN ISCHEMIA or INTRACRANIAL HEMORRHAGES. Stroke is classified by the type of tissue NECROSIS, such as the anatomic location, vasculature involved, etiology, age of the affected individual, and hemorrhagic vs. non-hemorrhagic nature. (From Adams et al., Principles of Neurology, 6th ed, pp777-810)

Blockage or rupture of a blood vessel supplying the brain; often leads to impaired brain function or death.

In medicine, a loss of blood flow to part of the brain, which damages brain tissue. Strokes are caused by blood clots and broken blood vessels in the brain. Symptoms include dizziness, numbness, weakness on one side of the body, and problems with talking, writing, or understanding language. The risk of stroke is increased by high blood pressure, older age, smoking, diabetes, high cholesterol, heart disease, atherosclerosis (a build-up of fatty material and plaque inside the coronary arteries), and a family history of stroke.

Sudden impairment of blood flow to a part of the brain due to occlusion or rupture of an artery to the brain.

Sudden neurologic impairment due to a cerebrovascular disorder, either an arterial occlusion or an intracranial hemorrhage.

A stroke happens when there is a loss of blood flow to part of the brain. Your brain cells cannot get the oxygen and nutrients they need from blood, and they start to die within a few minutes. This can cause lasting brain damage, long-term disability, or even death. If you think that you or someone else is having a stroke, call 911 right away. Immediate treatment may save someone's life and increase the chances for successful rehabilitation and recovery. There are two types of stroke: Ischemic stroke is caused by a blood clot that blocks or plugs a blood vessel in the brain. This is the most common type; about 80% of strokes are ischemic.; Hemorrhagic stroke is caused by a blood vessel that breaks and bleeds into the brain. Another condition that's similar to a stroke is a transient ischemic attack (TIA). It's sometimes called a "mini-stroke." TIAs happen when the blood supply to the brain is blocked for a short time. The damage to the brain cells isn't permanent, but if you have had a TIA, you are at a much higher risk of having a stroke. Certain factors can raise your risk of a stroke. The major risk factors include: High blood pressure. This is the primary risk factor for a stroke.; Diabetes.; Heart diseases. Atrial fibrillation and other heart diseases can cause blood clots that lead to stroke.; Smoking. When you smoke, you damage your blood vessels and raise your blood pressure.; A personal or family history of stroke or TIA.; Age. Your risk of stroke increases as you get older.; Race and ethnicity. African Americans have a higher risk of stroke. There are also other factors that are linked to a higher risk of stroke, such as: Alcohol and illegal drug use; Not getting enough physical activity; High cholesterol; Unhealthy diet; Having obesity. The symptoms of stroke often happen quickly. They include: Sudden numbness or weakness of the face, arm, or leg (especially on one side of the body); Sudden confusion, trouble speaking, or understanding speech; Sudden trouble seeing in one or both eyes; Sudden difficulty walking, dizziness, loss of balance or coordination; Sudden severe headache with no known cause. If you think that you or someone else is having a stroke, call 911 right away. To make a diagnosis, your health care provider will: Ask about your symptoms and medical history; Do a physical exam, including a check of Your mental alertness; Your coordination and balance; Any numbness or weakness in your face, arms, and legs; Any trouble speaking and seeing clearly.; Run some tests, which may include Diagnostic imaging of the brain, such as a CT scan or MRI; Heart tests, which can help detect heart problems or blood clots that may have led to a stroke. Possible tests include an electrocardiogram (EKG) and an echocardiography. . Treatments for stroke include medicines, surgery, and rehabilitation. Which treatments you get depend on the type of stroke and the stage of treatment. The different stages are: Acute treatment, to try to stop a stroke while it is happening; Post-stroke rehabilitation, to overcome the disabilities caused by the stroke; Prevention, to prevent a first stroke or, if you have already had one, prevent another stroke. Acute treatments for ischemic stroke are usually...

(cerebrovascular accident) Brain tissue necrosis due to a disturbance in the blood flow or hemorrhage.

A disorder characterized by a decrease or absence of blood supply to the brain caused by obstruction (thrombosis or embolism) of an artery resulting in neurological damage.

Strokes are a heterogeneous group of disorders involving sudden, focal interruption of cerebral blood flow that causes neurologic deficit. Strokes can be�

A stroke occurs when the blood supply to part of your brain is interrupted or reduced, preventing brain tissue from getting oxygen and nutrients. Brain cells begin to die in minutes.

Stroke, sudden impairment of brain function resulting either from a substantial reduction in blood flow to some part of the brain or from intracranial bleeding. The consequences of stroke may include transient or lasting paralysis on one or both sides of the body, difficulties in speaking or...