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心衰是由多种原因引起或诱发的临床综合征。以往的治疗,多强调心脏本身因素而应用强心甙,虽大多数患者病情能得到控制,但也不乏疗效不佳和无效者.根据影响血流动力学的诸多因素分析,治疗上只强调心脏本身的因素,显然是片面的。60年代以来,应用血管扩张剂减轻心脏负荷,为心衰的治疗开辟了一条新途径。一、心脏前、后负荷及其影响因素健康机体为了适应休息或运动时的代谢需要,可通过四条途径调节心脏的功能,前负荷、后负荷、心肌收缩力与心率。事实上,可将心肌收缩力和心率看作是调节前后负荷并使它们处于良好工作
Heart failure is caused by a variety of causes or induced clinical syndrome. The past treatment, more emphasis on the heart itself factors and the application of cardiac glycosides, although most patients with disease can be controlled, but there are some ineffective and ineffective.According to many factors that affect hemodynamics, treatment only emphasizes the heart Their own factors are obviously one-sided. Since the 1960s, the application of vasodilators to relieve cardiac stress has opened a new avenue for the treatment of heart failure. First, the heart before and after the load and its influencing factors Healthy body in order to adapt to resting or exercise metabolic needs, through the four ways to regulate the heart function, preload, afterload, myocardial contractility and heart rate. In fact, myocardial contractility and heart rate can be thought of as adjusting the fore-and-aft load and keeping them in good working order