患者,男性,72岁。慢性支气管炎伴肺气肿20年,2周来痰液不易咳出,常有喘鸣,头痛、烦躁,白天嗜睡、夜间失眠,应考虑为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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