论文部分内容阅读
呼吸困难,容易疲劳使得体力活动受限是慢性心功能不全(CHF)的重要临床表现。CHF 是指机体组织不能获得足够氧供的病理状态,是以心脏功能不全为基础。心脏泵功能障碍的原因包括心肌缺血、心肌病所致心肌功能不全和瓣膜病、高血压等所致心脏负荷增大引起CHF 两类。此时,靠以下机制维持心搏出量和末梢循环:①心腔扩大,通过Frank—Starling 定律起作用;②心肌肥厚以纠正心壁应力;③血中儿茶酚胺类物质增加引起心率加快、心肌收缩力增强,以及末梢血管收缩使血流量重新分配来维持血压。重症CHF 者在安静时亦不能完成上述代偿机制。轻症CHF 者在运动对心脏储备力达极限,可因呼吸困
Dyspnea, fatigue, fatigue, physical activity is limited to an important clinical manifestation of chronic heart failure (CHF). CHF refers to the body tissue can not get enough oxygen for the pathological state, is based on cardiac insufficiency. Causes of cardiac pump dysfunction include myocardial ischemia, myocardial dysfunction caused by cardiomyopathy and valvular disease, hypertension and other causes of increased heart load caused by two types of CHF. At this point, by the following mechanism to maintain cardiac output and peripheral circulation: ① heart chamber expansion, through the Frank-Starling law play a role; ② myocardial hypertrophy to correct cardiac stress; ③ blood catecholamines cause increased heart rate, myocardial contraction Increased power, and peripheral vasoconstriction to redistribute blood flow to maintain blood pressure. Severe CHF were also unable to complete the above-mentioned compensatory mechanism in the quiet. Mild CHF exercise in the heart of the reserve force reached the limit, due to breathing difficulties