55-year-old Male with Exertional Dyspnea.

Introduction: Dyspnea is a common presenting complaint for many patients in the emergency department.
Case Presentation: A 55-year-old man with type I diabetes presented to the emergency department with one month of intermittent palpitations and dyspnea. His lungs were clear to auscultation, and his chest radiograph was normal.
Discussion: This case takes the reader through the differential diagnosis and systematic work-up of dyspnea with discussion of the diagnostic study, which ultimately led to this patient's diagnosis and successful treatment.
Competing Interests: Conflicts of Interest: By the CPC-EM article submission agreement, all authors are required to disclose all affiliations, funding sources and financial or management relationships that could be perceived as potential sources of bias. The authors disclosed none.
(Copyright: © 2020 Friedman et al.)