to reduce dyspnea and to prevent hypoxemia. A number of studies have shown that use of oxygen during exercise can increase the duration of exercise and reduce the severity of end-exercise breathlessness. 1 In the presence of daytime hypoxemia (Pa o 2 <55 mm Hg), a hematocrit greater than 50% to 55%, morning headaches, daytime sleepiness, and poor exercise tolerance are indications of oxygen desaturation during sleep. 10 Monitoring of oxygen saturation during the night may be indicated for these patients because sleep can cause hypoventilation and nocturnal hypoxemia. Oxygen therapy at night will reduce the incidence of nocturnal hypoxemia. 10 Criteria for 24-Hour Supplemental Oxygen• Pa o 2 of 55 mm Hg or less, or an oxygen saturation of 88% or less while breathing room air• Pa o 2 of 56 to 59 mm Hg or an oxygen saturation of 89% or less with evidence of pulmonary hypertension, cor pulmonale, or erythrocytosisThe need for long-term oxygen therapy should be reassessed 30 to 90 days after an acute exacerbation if that was the situation for which oxygen was prescribed. Oxygen therapy may be discontinued if the patient no longer meets the blood gas criteria. The development of simpler and more portable oxygen tanks and devices has helped improve the quality of life and increase mobility for persons requiring long-term oxygen therapy.
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