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一、以泵机能障碍为中心的心力衰竭急性心肌梗塞合并心力衰竭的病例,应用洋地黄不增加心肌的耗养量(MVO_2),因正性变力作用使心肌收缩力增强,改善泵机能,降低室充盈压和左室舒张终压(VEDP),从而增加心排血量,此外,在减轻肺水肿上也有效。但对不合并心力衰竭的病例,则难以使症状得到改善,且伴有(MVO_2)增加倾向,有可能使梗塞范围扩大和病变的恶化,以不用洋地黄治疗为宜。
First, to pump dysfunction as the center of heart failure in patients with acute myocardial infarction complicated by heart failure, the application of digitalis does not increase the amount of myocardial cells (MVO_2), due to positive variable force to enhance myocardial contractility, improve pump function, Reduce ventricular filling pressure and left ventricular diastolic pressure (VEDP), thereby increasing cardiac output, in addition, the reduction of pulmonary edema is also effective. However, the cases without heart failure, it is difficult to make the symptoms improved, and associated with (MVO_2) tend to increase, it is possible to expand the infarct size and pathological deterioration, without digitalis treatment is appropriate.