An oxygen mask is a disposable clear plastic mask that fits over the chin, mouth and nose to allow the patient to breathe nearly pure oxygen.  Because of the higher risk, it is only used in preference with a nose tube when it is felt the patient will have trouble breathing through their nose.  

In House M.D. - Critical Cases, the oxygen mask is one of the Supplies required to progress through the game's stages.  It is associated with the color green and the heart.

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