SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
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Oxygen therapy. A patient undergoing oxygen therapy to manage chronic obstructive ling disease (COLD). The oxygen is delivered as enriched air at a concentration of 30-35% as compared with the 21% in normal air. The enriched air is administered through a nasal cannula. Chronic obstructive lung disease is a condition which presents as a combination of chronic bronchitis and emphysema. This is seen as a narrowing of the airways, leading to extreme shortness of breath. COLD is most often a result of tobacco smoking or pollution and is seen in about 1 in 60 of the general population. Although not treatable in the long term, COLD can be managed well by oxygen therapy. Photographed in Yekaterinburg, Russia.
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