患者女性,50岁,因胸闷、咳嗽、咳痰、呼吸困难、尿少就诊,既往有风湿性心脏病二尖瓣狭窄。考虑患者出现了心力衰竭,下列检查不能反映心功能状态的是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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