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心功能不全或心力衰竭是一种常见的临床综合征,是指因各种心肌病变和心室负荷(容量或压力负荷)过重,导致心肌收缩力的原发或继发性减弱,使心脏不能泵出足够的血量来满足机体各种组织代谢需要的一种病理生理状态。心功能不全时血液动力学变化的特点为:(1)心排血量、心脏指数减低。这是由于心肌收缩力降低、心搏量减低所致,减低程度与心功能不全程度一致;(2)心室残留血量增加,心室舒张末期压力或肺毛细臂楔嵌压升高,升高程度与心室功能减低程度一致;(3)射血分数下降,这是反映心室排血功
Cardiac insufficiency or heart failure is a common clinical syndrome, refers to a variety of cardiomyopathy and ventricular load (capacity or pressure overload), leading to myocardial contractility of the primary or secondary weakening, so that the heart can not Pump enough blood to meet the body’s various metabolic needs of a pathophysiological state. Cardiac dysfunction, hemodynamic changes are characterized by: (1) cardiac output, cardiac index decreased. This is due to reduced myocardial contractility, decreased stroke volume due to the degree of reduction and cardiac insufficiency the same extent; (2) increase in ventricular residual blood pressure, ventricular end-diastolic pressure or pulmonary capillary wedge pressure increases, the degree of increase And reduce the degree of ventricular function consistent; (3) ejection fraction decreased, which is reflected in ventricular discharge