患某男性,70岁。有COPD病史,因近日咳嗽、咳痰、气急明显,又出现神志不清,发绀,作血气分析pH 7.3,PaO240mmHg,PaCO270mmHg,应给予( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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