Ⅱ型呼衰的血气诊断标准是:() [单选题] *

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Ⅱ型呼衰的血气诊断标准是:() [单选题] *

A.Pa02<50mmHg,PaC02>45mmHg

B.Pa02<50mmHg,PaC02>60mmHg

C.Pa02<60mmHg,PaC02>50mmHg

D.Pa02<40mmHg,PaC02>40mmHg

E.Pa02<70mmHg,PaC02>55mmHg

答案解析