DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Feet in COPD. Close-up of the feet of an 89-year-old female patient with COPD (chronic obstructive pulmonary disease). COPD is an obstructive lung disease that causes poor airflow. Here, the patient's feet have turned blue due to a lack of oxygen supply as a result of the disease.
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