How deep do you think the kids are? The air is ‘thin’ to those who do not live at Mile High City. What if you were deep underground? And came up to sea level?
https://scienceline.org/2015/02/why-do-you-feel-so-awful-at-high-altitudes/
However, my quick perusal of the literature does not show the need for mechanical ventilation as a therapy.
But, if the patient is in very poor health...?
Good points. ThankQ!