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Images in clinical medicine. Dahl's sign.
New England Journal of Medicine 2014 July 25
A 76-year-old woman was admitted to the hospital with shortness of breath. She had tachypnea and was breathing through pursed lips. The patient had a long history of advanced chronic obstructive pulmonary disease (COPD), with a forced expiratory volume in 1 second of 21% of the predicted value. The..
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