患者男性,28岁。幼时曾患百日咳。咳嗽、咳痰3个月,近日咳大量脓痰今日早晨突然咯血3口。一旦出现支气管扩张大咯血,患者最危险且最常见的并发症是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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