心血管病(心脏和血管的疾病),在美国是死亡的首要原因。患本病人数达2800多万人,仅在美国,每年即约有100万人因此类疾病而死亡。这意味着,在这个国家,全部死者的一半是死于心血管病。虽然这种病的发病率随着年龄而增长,但它又不限于高龄者。例如,因心脏病发作而死亡者当中,有四分之一死在六十五岁之前。不用说,医学科学家们很想知道,究竟是什么原因引起心血管病。他们希望,掌握了这 Cardiovascular disease (heart and vascular disease) is the leading cause of death in the United States. The number of affected patients amounts to more than 28 million people. In the United States alone, about 1 million people die each year from such diseases. This means that in this country, half of all the dead are dying of cardiovascular disease. Although the incidence of this disease increases with age, it is not limited to the elderly. For example, a quarter of those who died of a heart attack died before the age of 65. Needless to say, medical scientists are wondering exactly what causes cardiovascular disease. They hope, have mastered this