Asymptomatic Bradycardia and Normal Chest Radiography in a Patient With Spontaneous Pneumomediastinum: A Case Report of a Rare Entity.

Spontaneous pneumomediastinum (SPM) is an uncommon condition caused by alveolar rupture due to increased intra-alveolar pressure resulting in air tracking along the tracheobronchial tree. While chest pain, neck pain, and dyspnea are the most commonly described symptoms, bradycardia could be an associated manifestation occasionally. In the majority of cases, pneumomediastinum is usually diagnosed on chest X-ray. We present an atypical case of chest X-ray-negative SPM complicated by marked bradycardia, which has been sparsely documented in published literature.