SIMPLE OXYGEN MASKS can provide 35-50% FIO2, depending on fit, at flow rates from 5-10 L/min. Flowrates should be maintained at 5 L/min or more in order to avoid re-breathing exhaled CO2 that can be retained in the mask.(1,20,28)
Caution should be taken when using a simple mask where accurate delivery of low concentrations of oxygen is required.(29) Long-term use of simple mask can lead to skin irritation and pressure sores.(30)
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