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一、何谓心力衰竭? 当心肌的收缩性减弱(心肌的收缩力减弱和收缩速度减慢),在休息或一般活动情况下,心脏仍不能将静脉回流的血液充分地搏入动脉,使心输出量减少到不能满足机体需要的病理过程,称为心力衰竭。临床上主要表现为呼吸困难、颈静脉怒张、肝脏肿大、下肢或全身水肿等。要了解心力衰竭的机理,首先必须知道心肌收缩的原理。二、心肌是怎样收缩的? 心肌细胞中含有大量肌原纤维、线粒体和肌浆小
First, what is heart failure? When the contractility of myocardial weakening (myocardial contractility decreased and the rate of contraction slowed down), rest or general activity, the heart still can not be fully venous return of the blood into the artery, the heart output Reduced to the pathological process can not meet the needs of the body, known as heart failure. The main clinical manifestations of dyspnea, jugular vein engorgement, liver enlargement, lower extremity or systemic edema. To understand the mechanism of heart failure, we must first know the principle of myocardial contraction. Second, how the myocardial contraction? Myocardial cells contain a large number of myofibrils, mitochondria and sarcoplasia small