Is the long-term use of supplemental oxygen beneficial for people with COPD?

Chronic obstructive pulmonary disease (COPD) affects millions of Americans and is the third leading cause of death in the U.S. COPD is not a single disease, but rather a group of diseases that make it difficult to breathe. This includes diseases such as emphysema, chronic bronchitis, and occasionally, asthma. COPD can be caused by a variety of factors, but the biggest factor in its development is tobacco smoke1. Symptoms of COPD worsen over time and include wheezing, shortness of breath, chest tightness, and coughing with profuse mucus2.

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