患者女性,70岁,有风湿性心脏病二尖瓣狭窄,反复住院治疗,此次住院治疗效果不佳,病情不稳定而死亡。风湿性心瓣膜病最主要的致死原因是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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