Spontaneous Pneumomediastinum: A Rare Case of BradycardiaRaya, Nischal, MD; Gamino, Amie, MDClinical Pulmonary Medicine: March 2018 - Volume 25 - Issue 2 - p 74–76 doi: 10.1097/CPM.0000000000000241 Images in Pulmonary Medicine Abstract Author InformationAuthors Article MetricsMetrics Pneumomediastinum is an uncommon phenomenon that may occur in a number of clinical contexts, such as chest trauma, barotrauma, esophageal rupture, or asthma, but it may also occur idiopathically; the latter condition is often referred to as “spontaneous pneumomediastinum” (SPM), formerly as Hamman syndrome. Typically, symptoms associated with SPM are benign, and the condition is self-limited, despite an impressive physical examination largely owing to the presence of subcutaneous emphysema. We illustrate 2 patients who presented with SPM associated with asymptomatic bradycardia, most likely due to the increased stimulation of receptors in the aortic arch and/or carotid sinus, producing increased vagal tone. Rush University Medical Center, Pulmonary and Critical Care Medicine, Chicago, IL Disclosure: The authors declare that they have no conflicts of interest. Address correspondence to: Nischal Raya, MD, Rush University Medical Center, 1653 W Congress Parkway, Chicago, IL 60612. E-mail: email@example.com. Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved.