Diffusion hypoxia may occur if insufficient 100% oxygen is delivered at the termination of a nitrous oxide procedure because

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Diffusion hypoxia occurs because of the rapid outward flow of nitrous oxide accompanied by oxygen and carbon dioxide.The loss of carbon dioxide,a stimulant to the respiratory drive,could decrease ventilation with resultant hypoxia.The patient may complain of headaches or other side effects if this occurs.Nitrous oxide does not cause deflation of the lungs.Nitrous oxide is very insoluble in blood,which leads to quick onset and recovery.

Diffusion Hypoxia May Occur If Insufficient 100% Oxygen Is Delivered