Diffusion hypoxia

The Fink effect, also known as "diffusion anoxia", "diffusion hypoxia", or the "third gas effect", is a factor that influences the pO₂ (partial pressure of oxygen) within the alveolus. When soluble gases (e.g. nitrous oxide, N₂O) are breathed in large quantities they can be dissolved in body fluids rapidly. This can lead to a temporary increase in the concentration of oxygen and carbon dioxide in the alveolus, causing an increase in their respective partial pressures.