[The rule of changes in arterial blood gas in COPD patients with respiratory failure and efficacy of oxygen therapy].
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D000328:Adult; D000368:Aged; D001784:Blood Gas Analysis; D002940:Circadian Rhythm; D005260:Female; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000150:complications*; D008297:Male; D008875:Middle Aged; D010102:Oxygen Inhalation Therapy; D012131:Respiratory Insufficiency / Q000097:blood* / Q000209:etiology / Q000628:therapy