药理作用一、对心脏的作用: 洋地黄进入机体后,能选择地直接作用于心肌,使心肌收缩力加强,心脏收缩期缩短,舒张期延长。由于舒张期延长,使心脏:一、能获得充分的休息,二、能使心室充盈血量增加,并能有效的排空血液,使血液循环得到改善。洋地黄能使心肌收缩力增强的机制,目前尚未完全阐明,有认为是“收缩蛋白说”;有认为是“离子说”;目前许多学者主张为离子说中的“阻钠外流说”,即心肌于受到神经冲动而去极化时,钠随浓度差进入细胞内,复极化时,又再流出细胞外。在心甙的影响下,进 Pharmacological effects First, the role of the heart: Digitalis into the body, can selectively act directly on the myocardium, myocardial contractility to strengthen the systolic shortening, diastolic prolongation. Due to prolonged diastolic, so that the heart: one, can get adequate rest, two, can make the ventricular filling blood increased, and can effectively empty the blood, so that blood circulation is improved. At present, the mechanism that digitalis can increase myocardial contractility is not yet completely elucidated, and it is thought to be “contractile protein”. Some scholars think that it is “ion-speaking.” At present, many scholars advocate that " Myocardial nerve impulses and depolarization, sodium with the concentration difference into the cell, repolarization, and then out of the cell. Under the influence of the glycosides, into