患者女性,30岁,因患慢性风湿性心瓣膜病、二尖瓣狭窄收入院。患者近来症状严重,医生要求护士观察心律变化,及时发现心律失常的发生。风心病二尖瓣狭窄最常见的心律失常是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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