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当前学科：心血管疾病
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患者，女性，38岁。患风心病、二尖瓣病变、心房颤动多年。服用地高辛0.25mg，每天1次，共12天，突然心室律变为规整，室率50次/分。出现以上心电图变化最可能的原因为（）。
A . A.心衰控制
B . 洋地黄中毒
C . 洋地黄剂量不足
D . 洋地黄剂量合适
E . 未用利尿剂
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