A stroke is an injury to the brain caused by interruption of its blood flow, or by bleeding into or around the brain. Stroke produces focal neurologic deficits that can have a relatively sudden onset and persist for more than 24 hours or severe sudden headache.
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. Strokes can be classified as either: ischemic or hemorrhagic.
In an embolic stroke, a piece of material (or embolus) travels from a distant location and lodges in the blood vessel, occluding it. The most common type of embolus is a blood clot. Because the blockage arrives from another location, the onset of embolic strokes is usually quicker than that of thrombotic strokes.
Although less common (~15% of strokes), hemorrhagic (or bleeding) strokes can be much more serious. This is because in addition to the interruption of blood supply to the target tissue, the hemorrhage (bleed) can also cause increasing intracranial pressure which can physically impinge on brain tissue, further impairing perfusion of the cerebrum.
Strokes can be classified as either: ischemic or hemorrhagic. Ischemic strokes are the most common, accounting for up to 80% of strokes, 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
(stroke) 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.
Stroke (also called cerebrovascular accident) is a condition that reduces blood flow to the central nervous system—specifically, the brain.
They happen when a blood clot blocks the flow of blood and oxygen to the brain. These blood clots typically form in areas where the arteries have been narrowed or blocked over time by fatty deposits known as plaques.
Its origin as a medical term goes back to the 1500s when it was shortened from "the Stroke of God's Hand."
A stroke is defined as the clinical syndrome of rapid onset of cerebral deficit lasting more than 24 hours or leading to death with no apparent cause other than a vascular one. A stroke is a rapid loss of brain function due to the disturbance in the blood supply to brain.
There are two types of stroke:Ischemic stroke.Hemorrhagic stroke.
A stroke occurs when a blood vessel that carries oxygen and nutrients to the brain is either blocked by a clot or bursts (or ruptures). When that happens, part of the brain cannot get the blood (and oxygen) it needs, so it and brain cells die. 80 percent of strokes are preventable.
What Are the Types of Strokes?Ischemic Stroke.Hemorrhagic Stroke.Transient Ischemic Attack (Mini-Stroke)Brain Stem Stroke.Cryptogenic Stroke (stroke of unknown cause)