An oxygen delivery system with an entrainment flow has a patient peak inspiratory flow of 60 L/min. The system's total flow is 70 L/min. Is the flow adequate to meet the patient's peak inspiratory demand?

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The main idea is that the total flow from an oxygen delivery system with entrainment must meet or exceed the patient’s peak inspiratory flow. When the patient can inhale up to 60 L/min and the system can deliver a total of 70 L/min, there is enough capacity to meet that peak demand without needing to entrain additional room air. This margin helps keep the delivered flow consistent and maintains the intended oxygen delivery. If the total flow were less than the peak inspiratory flow, the patient would draw in more ambient air, diluting the oxygen concentration. So, a total flow of 70 L/min meeting a 60 L/min peak means the flow is adequate.