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PEFFEV 1 2 20min 1h PEF 6080 60min 2 13 h 60min PEF>70% >90% 95 PEF> 60% 2 12 h PEF 1~2 h ~ PEF<70% 2 PEF< 60 2 2 1h PEF<30% PaCO 2 >45mmhg PaO 2 <60mmhg 2 2 612h 9
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