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第一节强心药凡在固有生理机能的限度内,能预防心力衰竭或兴奋陷於衰竭的心脏,使它恢复代偿作用的药物,叫做强心药。因此在提到强心药以前,必须对心力衰竭的一般情况有一概括的理解。一、心脏的补偿作用心脏在生理情况之下,当全身组织需血量增加时,可以依靠心率增速和心脏暂时扩张等机能来增加排血量,而在病理情况下,如心肌、心瓣膜、心包膜或血管发生病变,为了维持一定的排血量以应所需,除上述两种机能勉力支持外,更有心脏肥厚和扩大及皮肤和内脏的小血管收缩等代偿机能(后者叫做心外化偿机能),使心脏得以维持一定的排血量。
In the first quarter, a drug that can prevent heart failure or excitement from falling into a failing heart within the limits of its inherent physiological functions, and it can restore its compensatory effect, is called a cardiac drug. Therefore, before referring to cardiac drugs, we must have a general understanding of the general condition of heart failure. First, the compensatory function of the heart under the physiological conditions of the heart, when the body tissue needs increased blood volume, can rely on heart rate growth and cardiac temporary expansion and other functions to increase the discharge of blood, and in pathological conditions, such as myocardial, heart valve , pericardium or angiogenesis lesions, in order to maintain a certain amount of blood discharge should be required, in addition to the above two kinds of functional support, more cardiac hypertrophy and enlargement and skin and visceral small blood vessels shrinkage and other compensatory functions (after The so-called extracardiac function enables the heart to maintain a certain amount of blood.