共用题干 Facts about Stroke

1 Every 45 seconds,someone in America has a stroke.Every 3. 1 minutes,someone
dies of one.Stroke killed an estimated 167,661 people in 2000 and is the nation"s third
leading cause of death,ranking behind diseases of the heart and all forms of cancer.
Stroke is a leading cause of serious,long-term disability in the United States.
2 Stroke is a type of cardiovascular（心血管的）disease. It affects the arteries（动脉）
leading to and within the brain.A stroke occurs when a blood vessel that carries oxygen
and nutrients（营养物）to the brain is either blocked by a clot（凝块）or bursts. When
that happens,part of the brain cannot get the blood(and oxygen)it needs,so it starts
to die.
3 The brain is an extremely complex organ that controls various body functions.If a stroke
occurs and blood flow can"t reach the region that controls a particular body function,that
part of the body won"t work as it should,If the stroke occurs toward the back of the brain,
for instance,It"s likely to result in some disablity involving vision.The effects of a stroke
depend primarily on the location of the obstruction（阻塞）and the extent of brain tissue
affected.
4 The American Stroke Association has identified several factors that increase the risk of
stroke.The more risk factors a person has,the greater the chance that he or she will have
a stroke.Some of these you can"t control,such as increasing age,family health history,
race,and prior stroke.But you can change or treat other risk factors to lower your risk.
Factors resulting from lifestyle or environment can be modified with a healthcare provider"s
help.Some of these include:high blood pressure,current smoking,heart disease,and
high red blood cell count.
5 A stroke can happen to anyone at any moment.In fact about 600,000 people have
strokes every year. For many years,there was no hope for those suffering a stroke.
However,recent breakthroughs have led to new treatments.For the treatments to work,
the person must get to a hospital immediately. Some people can reduce their risk of stroke if they_______.