【单选题】【消耗次数：1】
撤离经鼻高流量氧疗的指征
①
原发病控制，但呼吸情况未好转
②
原发病未控制，但呼吸情况好转
③
先提高氧浓度，后逐步降低气体流量(每次 5-8L/min )
④
当流量降到15L/min时，停止经鼻高流量氧疗，改为普通氧疗
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