试述洋地黄的利尿作用机理?其利尿作用有何特点?
洋地黄为强心苷类药物,能选择性地加强心肌的收缩力,增加充血性心力衰竭心脏的心输出量,肾血流量和肾小球滤过率增加,醛固酮分泌明显下降,呈现利尿作用。其利尿作用继发于循环改善,而不是对肾的直接作用。
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