AJ PHOTO / SCIENCE PHOTO LIBRARY AJ PHOTO / SCIENCE PHOTO LIBRARY
Emergency treatment. Elderly man wearing an oxygen mask for the treatment of breathing difficulties. The face mask provides oxygen-enriched air to treat hypoxia (inadequate oxygen in the body tissues), which can be caused by lung and breathing disorders such as asthma, emphysema and chronic bronchitis. A reservoir in the mask holds a solution (blue) of a bronchodilator drug.
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