Ramadurai D, et al. - Researchers assessed the physiologic and symptomatic effect of ambulatory oxygen (O₂) delivery devices in clinically stable interstitial lung disease (ILD) patients (with varying disease severity) who received supplementary O₂ therapy. Significantly greater dyspnea and shorter distances covered in timed testing were the findings in ILD patients who carried portable O₂ vs those who received O₂ via a stationary concentrator. The most impact could be seen in patients with the greatest impairment. When prescribing O₂, practitioners should alert patients to this impact and help patients decide on the best O₂ delivery mode to meet their needs.