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However, COAD is largely an irreversible condition and no therapeutic intervention has been shown to be universally useful. Theophylline or corticosteroid are occasionally helpful but most patients will not benefit. Of the remaining options, only oxygen has been shown to be effective in selected patients and should be administered on a continuous basis. It is becoming increasingly evident that clinicians should be more discriminating when making therapeutic decisions for persons with COAD. Maintenance therapy with pharmacological agents should be entertained only after individually conducted therapeutic trials. 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