Oxygen supplementation is used to treat tissue hypoxia and to relieve arterial hypoxemia. High concentrations of oxygen are often given to patients with chronic obstructive pulmonary disease (COPD) or acute lung injury (ALI). Supplementing oxygen is known to cause tissue damage, with toxicity increasing with the increase of oxygen concentrations and exposure pressures. Unfortunately, the supplementation of oxygen is necessary if an individual is not able to obtain sufficient oxygen through respiration and perfusion. To decrease the chances of<unk> , the therapist should use the lowest concentration of oxygen required by an individual. At this time, there are no known alternatives to oxygen supplementation.
Hyperoxia
Anoxia
Hypoxia 
Pseudohypoxia
Hypoventilation
Hyperventilation
Cerebral hypoxia
Silent hypoxia