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动脉粥样硬化自然疗法

动脉粥样硬化

动脉粥样硬化 (atherosclerosis) 是45岁以上人群的主要死亡原因,也是导致绝大多数心脏病发作和脑中风的原因。虽然动脉粥样硬化的起因还没有完全搞懂,但我们知道某些因素可以加速它的形成,如高血压、高胆固醇、糖尿病及相对较轻的糖耐量受损、吸烟、活动不积极、肥胖等。体内慢性炎症可能也起到一定的作用。

目前的理论提示动脉粥样硬化起于动脉内膜受损。高血压对内膜的应力作用,加上血循环中低密度脂蛋白(LDL)胆固醇、高半胱氨酸、自由基、尼古丁等物质的破坏作用,从而造成内膜受损。随后,白细胞粘附到受损的内膜上,胆固醇及其他脂类也在内膜上积聚。血小板同样也会黏附,并释放成纤维组织的物质。最后,总的效应就是动脉壁的增厚和管腔的狭窄。

当冠状动脉(供应心脏血液的动脉)狭窄达到75-90%,就会发生心绞痛。下肢动脉狭窄,就会造成运动时腿痛,称为间歇性跛行。另外,动脉的不规则表面会发生血栓,而血栓脱落会堵塞血流。同样,粥样硬化斑块也会脱落。心脏病的发作通常是由这种血栓脱落引起;而中风更多的是由斑块脱落或血管逐渐闭塞所致。还有,发生粥样硬化的动脉变得非常薄弱,可能突然破裂。

动脉粥样硬化

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最后修改日期 : 2008-12-08

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