stroke

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stroke,

destruction of brain tissue as a result of intracerebral hemorrhage or infarctioninfarction,
blockage of blood circulation to a localized area or organ of the body resulting in tissue death. Infarctions commonly occur in the spleen, kidney, lungs, brain, and heart.
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 caused by thrombosisthrombosis
, obstruction of an artery or vein by a blood clot (thrombus). Arterial thrombosis is generally more serious because the supply of oxygen and nutrition to an area of the body is halted.
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 (clotting) or embolusembolus
, foreign matter circulating in and obstructing a blood vessel. It may be a portion of a clot that has separated from the wall of a vessel (see thrombosis), a bubble of gas or air (known as an air embolus), a globule of fat, a clump of bacterial matter, or a clump of
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 (obstruction in a blood vessel caused by clotted blood or other foreign matter circulating in the bloodstream); formerly called apoplexy. Cerebral hemorrhage or thrombosis occurs most often in elderly persons with constricted arteries (see arteriosclerosisarteriosclerosis
, general term for a condition characterized by thickening, hardening, and loss of elasticity of the walls of the blood vessels. These changes are frequently accompanied by accumulations inside the vessel walls of lipids, e.g.
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), although either may also be caused by inflammatory or toxic damage to the cerebral blood vessels. Cerebral embolism may occur at any age, even in children.

Symptoms of stroke develop suddenly. In cases of severe brain damage there may be deep coma, paralysis of one side of the body, and loss of speech, followed by death or permanent neurological disturbances after recovery. If the brain damage sustained has been slight, there is usually complete recovery, but most survivors of stroke require extensive rehabilitation. Hypertensionhypertension
or high blood pressure,
elevated blood pressure resulting from an increase in the amount of blood pumped by the heart or from increased resistance to the flow of blood through the small arterial blood vessels (arterioles).
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, which is a major cause of intracranial hemorrhage and stroke, can be treated by preventive measures using diet (e.g., increasing nutrients such as antioxidants and folate), drug therapy, and stress reduction techniques. Other preventive measures for people at high risk include daily aspirin to retard clot formation and surgical correction of the narrowed carotid artery. Sometimes surgical removal of the clot is possible on larger vessels, but it is usually pointless after the stroke or when blockage is widespread. The thrombolytic drugthrombolytic drug
or clot-dissolving drug,
substance, such as streptokinase or tissue plasminogen activator (tPA), that causes the breakdown of blood clots (see thrombosis) that obstruct the flow of blood through the vessels.
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 tissue plasminogen activator, widely used to treat heart attacks, has been approved for use within three hours of the onset of strokes caused by clots.

stroke

[strōk]
(computer science)
In optical character recognition, straight or curved portion of a letter, such as is commonly made with one smooth motion of a pen. Also known as character stroke.
That segment of a printed or handwritten character which has been temporarily isolated from other segments for the purpose of analyzing it, particularly with regard to its dimensions and relative reflectance. Also known as character stroke.
(electronics)
The penlike motion of a focused electron beam in cathode-ray-tube diplays.
(mechanical engineering)
The linear movement, in either direction, of a reciprocating mechanical part. Also known as throw.
(medicine)
A sudden cerebrovascular accident.

stroke

strokeclick for a larger image
The linear distance the piston moves inside the cylinder from top to bottom in a reciprocating engine.

stroke

1. Pathol apoplexy; rupture of a blood vessel in the brain resulting in loss of consciousness, often followed by paralysis, or embolism or thrombosis affecting a cerebral vessel
2. a pulsation, esp of the heart
3. Sport the act or manner of striking the ball with a racket, club, bat, etc.
4. any one of the repeated movements used by a swimmer to propel himself through the water
5. a manner of swimming, esp one of several named styles such as the crawl or butterfly
6. 
a. any one of a series of linear movements of a reciprocating part, such as a piston
b. the distance travelled by such a part from one end of its movement to the other
7. a single pull on an oar or oars in rowing
8. manner or style of rowing
9. the oarsman who sits nearest the stern of a shell, facing the cox, and sets the rate of striking for the rest of the crew
www.neuro.wustl.edu/stroke
http://209.107.44.93/NationalStroke/default.htm

stroke

The oblique stroke character, "/", ASCII 47.

See ASCII for other synonyms.

stroke

(1) In printing, the weight, or thickness, of a character. For example, in the LaserJet, one of the specifications of the font description is the stroke weight from lightest to boldest. See stroke weight.

(2) In computer graphics, a pen or brush stroke. The stroke function lets you set the width of the line being drawn.
References in classic literature ?
Yankees have a trick of being generous to their enemies," said Jo, with a look that made the lad redden, "especially when they beat them," she added, as, leaving Kate's ball untouched, she won the game by a clever stroke.
Neither squeals of hogs nor tears of visitors made any difference to them; one by one they hooked up the hogs, and one by one with a swift stroke they slit their throats.
Contempt for the outburst of miserly gratitude of which he was the object; triumph in the sense of successful conspiracy against a man who had rated the offer of his protection at five pounds; regret at the lost opportunity of effecting a fine stroke of moral agriculture, which his dread of involving himself in coming consequences had forced him to let slip -- all these varied emotions agitated the captain's mind; all strove together to find their way to the surface through the outlets of his face or his tongue.
I am as bad as you; that was the worst stroke I ever made, I think.
They heard, I say, strokes falling with a measured beat, and a certain rattling of iron and chains that, together with the furious din of the water, would have struck terror into any heart but Don Quixote's.
That it should have taken him three strokes to hole out from this promising position was unfortunate, but not fatal, for Gossett, who seemed suddenly to have fallen off his game, only reached the green in seven.
His mighty strokes bade fair to close up the distance between us in short order, for at best I could make but slow progress with my unfamiliar craft, which nosed stubbornly in every direction but that which I desired to follow, so that fully half my energy was expended in turning its blunt prow back into the course.
Again she dove and with strong strokes headed for the shore.
The whole was written in a large, loose-jointed, and school-boyish hand, very thin on the up strokes and thick on the down, as though care and pains had gone to the fashioning of it.
There were many men in San Francisco against whom he had registered black marks, and now and again, with one of his lightning strokes, he erased such a mark.
The echoing chamber of his soul was a narrow room, a conning tower, whence were directed his arm and shoulder muscles, his ten nimble fingers, and the swift-moving iron along its steaming path in broad, sweeping strokes, just so many strokes and no more, just so far with each stroke and not a fraction of an inch farther, rushing along interminable sleeves, sides, backs, and tails, and tossing the finished shirts, without rumpling, upon the receiving frame.
But he was too feeble, panting and wheezing continually from the exertion and pausing to rest off strokes between strokes.