Chronic obstructive pulmonary disease, or COPD, is often diagnosed in late stages, as it is a slowly progressing condition. How can physicians diagnose patients with this deadly disease in its earlier stages, to increase the success of reversing some of its symptoms? Dr. Sidney Braman, professor of medicine at the Warren Alpert Medical School of Brown University, describes who is affected by COPD, and how physicians can best treat these patients. Dr. Todd Mahr hosts.