None: It simply makes oxygen from the air. Hence, no effect on the respiratory system at low concentration of oxygen.
Answered 11/23/2013
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None: An oxygen concentrator simply provides a higher level of oxygen to the lungs than room air can. It has no effect on the lungs themselves. It can be very helpful if a person's oxygen level is too low from either lung or heart disease.
Answered 2/2/2015
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