有下列哪几项指标应考虑呼吸衰竭 ( )

• A.PaO<img src="http://timg.fentiku.com/262/2016/11/24/33lmpRFrAM.png" title='33lmpRFrAM.png' alt='33lmpRFrAM.png'/><6.7 kPa(50mmHg)
• B.PaCO<img src="http://timg.fentiku.com/262/2016/11/24/Y7s5RuDCiU.png" title='Y7s5RuDCiU.png' alt='Y7s5RuDCiU.png'/>>6.7 kPa(50mmHg)
• C.SaO<img src="http://timg.fentiku.com/262/2016/11/24/ZPywa4IJcF.png" title='ZPywa4IJcF.png' alt='ZPywa4IJcF.png'/><85%
• D.PaCO<img src="http://timg.fentiku.com/262/2016/11/24/D3cK2VI70E.png" title='D3cK2VI70E.png' alt='D3cK2VI70E.png'/><6.7 kPa(50mmHg)
• E.动脉血pH>7.45

正确答案：ABC