患者,女,44岁,因风湿性心脏病左房室瓣狭窄伴心房颤动,长期服用地高辛每天0. 25mg ,1周来腹泻,恶心呕吐,进食量少。1天来出现心悸,发作性头晕、黑朦,有短阵意识丧失来院。查体:平卧位,神清,淡漠,双肺(—),心率38次/分,律整,心尖部可闻及舒张期隆隆样杂音,下肢不肿。患者来院就诊的直接病因是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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