风湿性心脏瓣膜病伴心力衰 竭患者，服用地高辛治疗1 周，前3天每天服用0.5mg, 后4天每天服用0_25mg,现 症状体征均明显改善，心率 80次/分，心电图示ST段呈 龟钩样改变。丨丨前正确的治疗 措施就是

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