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心脏有效而有节律地收缩,将回到心脏的血液妥善处理,排出适量的血液以满足人体各器官和组织在休息时以及在适量劳动时代谢之需要。健康的心脏有较大的工作储备能力,以适应人体代谢和负荷变化之所需。患病的心脏工作能力下降,心输出量降低,但可通过下列几个因素使降低了的心脏工作能力得到代偿,使心输出量接近或达到正常水平,此即心脏病的心功能代偿期。起代偿作用的因素有:(1)心室舒张期末容量增加(回心的血量增加,心脏扩大);(2)肾上腺素能的活性增加,使心率加快及心肌收缩力加强;(3)心肌肥厚。当原有的心脏病加重到一定程度
The heart contracts effectively and rhythmically, returning the blood to the heart for proper disposal, expelling the right amount of blood to meet the needs of the body’s organs and tissues at rest and during times of work-time metabolism. A healthy heart has a greater work reserve capacity to accommodate the body’s metabolic and load changes. Decreased ability to work with a diseased heart and reduced cardiac output can be compensated for by reduced heart work capacity by bringing the cardiac output close to or at a normal level by several factors, period. (2) increase in adrenergic activity, so that the heart rate and myocardial contractility; (3) the role of ventricular diastolic volume increased Cardiac hypertrophy. When the original heart disease increased to a certain extent