心脏彩超检查结果，舒张期左房内径:46mm，舒张期左室内径：65mm，舒张期右房内径：39mm，舒张期右室内fe:23mm，并提示:各室壁运动普遍减弱，二尖瓣有轻度反流，EF0.34。其病因诊断考虑为

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