Medical Gas Therapy Practice Test

The correct answer highlights that the statement regarding the simple oxygen mask being able to deliver high FIO2 values greater than 0.6 to 0.7 is false. This is because a simple oxygen mask primarily works by mixing oxygen from the mask with ambient air, which limits its ability to consistently deliver high concentrations of oxygen. Typically, the FIO2 achieved with a simple mask ranges from approximately 35% to 50% under normal circumstances, depending on the patient's breathing pattern and the flow rate of oxygen supplied.

The other aspects of simple O2 masks are accurate representations of their function. The FIO2 is indeed variable, influenced by factors such as the flow rate and the patient's tidal volume. In terms of flow rates, using a range of 5-10 L/min is appropriate for ensuring that there is enough oxygen flow to prevent CO2 buildup and adequately deliver supplementary oxygen.