男,34岁,查体发现心尖部舒张期隆隆样杂音,心率76次/分,律齐,肝脾肋下未及,双下肢无水肿。超声心动图示风湿性二尖瓣狭窄,瓣口面积为1.7cm2。平时活动无受限。哪项处理最合适()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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