title: 48-Year-Old Man With Dyspnea on Exertion.
authors.affiliation: Resident in Internal Medicine, Mayo School of Graduate Medical Education, Rochester, MN.
authors.forename: Jared T
authors.initials: JT
authors.lastname: Perrin
authors.affiliation: Advisor to resident and Consultant in Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN. Electronic address: kennedy.cassie@mayo.edu.
authors.forename: Cassie C
authors.initials: CC
authors.lastname: Kennedy
mesh_terms: D003937:Diagnosis, Differential; D004417:Dyspnea / Q000175:diagnosis* / Q000209:etiology / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D005082:Physical Exertion / Q000502:physiology*; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications* / Q000235:genetics*; D016896:Treatment Outcome; D014481:United States; D019896:alpha 1-Antitrypsin Deficiency / Q000175:diagnosis* / Q000235:genetics / Q000628:therapy*