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doesn't there have to be an airway obstruction (mucus, foreign object etc.) in order for this to happen? 100% O2 without any airway obstruction should not cause absorption atelectasis, right?
And Tension Pneumothorax is wrong bc PEEP would furthur exacerbate that.
@iloveallpotatoes yea i realized that now after getting it wrong :(
@bighead478, they are using a cuffed endotracheal tube and mechanically ventilating this patient which is creating an iatrogenic "obstruction" and as @haliburton mentioned, having a high FiO2 leads to over-absorption by the blood which leads to absorption atelectasis if no other gas is allowed to enter/there is no communication with atmospheric pressure during expiration. Thus, we add positive end-expiratory pressure which keeps alveoli open at the end of expiration to prevent collapse