Oxygen therapy for interstitial lung disease: a systematic review

Area of Science:

• Pulmonary Medicine
• Respiratory Research
• Clinical Trials

Background:

• Interstitial lung disease (ILD) is characterized by progressive lung scarring, leading to debilitating symptoms like dyspnoea.
• The role of oxygen therapy in managing ILD symptoms and improving patient outcomes remains incompletely understood.
• Existing evidence on oxygen's impact on health-related quality of life (HRQoL), exercise capacity, and mortality is limited.

Purpose of the Study:

• To systematically review the impact of oxygen therapy on dyspnoea, HRQoL, exercise capacity, and mortality in adults with ILD.
• To evaluate both acute and long-term effects of oxygen administration in the ILD population.
• To identify gaps in current research and guide future clinical trials.

Main Methods:

• A systematic review of studies comparing oxygen therapy to no oxygen therapy in adult ILD patients.
• Inclusion of studies regardless of design or intervention type, with independent review and data extraction by two researchers.
• Primary outcome assessed was dyspnoea, with secondary outcomes including HRQoL, exercise capacity, and mortality.

Main Results:

• Eight studies evaluated acute oxygen effects (n=1509), showing no significant impact on end-exercise dyspnoea (MD -0.06 units).
• Exercise outcomes consistently favored oxygen therapy, with one study noting reduced resting dyspnoea in acutely unwell patients (VAS 30mm vs 48mm).
• Four long-term oxygen therapy studies (n=2670) had high risk of bias, precluding definitive conclusions.

Conclusions:

• Oxygen therapy does not appear to improve exercise-induced dyspnoea in ILD patients.
• Acute administration of oxygen can increase exercise capacity in this population.
• Further research is needed to determine if improved exercise capacity translates to enhanced physical activity and HRQoL.