简述氧治疗的适应证。
参考答案：
氧治疗的目的是：
（1）低氧血性缺氧：低氧血症是由PaO2降低、血红蛋白含量减少或血红蛋白饱和异常引起CaO减少的一种状态。
（2）低血流性缺氧：循环衰竭：心跳骤停、休克、心衰和严重心律失常导致循环衰竭，引起广泛组织低灌注，发生缺血、缺氧。局部灌注减少：AMI、脑卒中时，引起局部组织缺血、缺氧、代酸和组织坏死。
（3）氧利用障碍型缺氧：又称组织中毒性缺氧，细胞利用氧能力降低。如氰化物中毒。脓毒性休克、ARDS等时，组织VO2依赖DO2，提示氧利用障碍。
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| Peter is thirteen years old. He is 1 Grade Two this year. He likes to play football and watch football matches. And he often 2 newspapers. He does his best to know where and when a football match will be. Now Peter is having lunch. He is 3 the radio, too. He is very happy 4 there will be a nice football match on TV at four 5 this afternoon. He wants 6 it very much. But he is going to have English and Chinese lessons. It's 7 for him to find a way. "Hello, Mrs Black," Peter says to his teacher 8 the phone. "Peter is ill in bed. He wants to ask for half a day's leave (请假)." "Oh, I'm 9 to hear that," says Mrs Black. "But 10 is that?" "It's my father, Mrs Black." | ||||
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