洋地黄类药物是具有正性肌力作用的强心甙,目前最常用的为地戈辛、西地兰以及毒毛旋花子甙等。洋地黄直接加强心脏收缩的作用机理尚未完全明确。目前多数学者倾向于认为:它使心肌细胞肌膜—横管系统内流的钙离子增多,供兴奋—收缩偶联用的游离钙离子增加,收缩蛋白就更加有力地收缩。但是钙离子内流增加的原因迄今尚无一致的意见。有人认为洋 Digitalis is a positive cardiac muscle function of cardiac glycosides, the most commonly used for the geoxincin, ceddiolan, and venom aglycone and so on. Digitalis directly to strengthen the mechanism of systolic action is not yet fully clear. At present, most scholars tend to believe that: it makes the myocardial cell membrane - horizontal duct influx of calcium increased for excitement - shrinkage coupling with the increase of free calcium, contractile more strongly contracted. However, the reason for the increased calcium influx has so far no consensus. Some people think that ocean