男性,55岁,间断咳嗽、憋气10年,间断下肢水肿1年。胸片示肺纹理增重,心脏扩大。下列哪项病史对诊断肺心病意义不大()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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