DOI: 10.5811/westjem.2012.8.12919

A 49-year-old man was brought to the emergency department by ambulance after he sustained a stab wound to the chest. He was alert but diaphoretic, with an initial systolic blood pressure of 90 by palpation and a heart rate of 110. A 1 cm laceration was noted at the left lower sternal border. Lung sounds were clear bilaterally, and heart sounds were muted. His cervical collar was removed, revealing distended neck veins (Figure). A bedside ultrasound demonstrated pericardial fluid (Video). The patient had a pericardial effusion from penetrating chest trauma, causing cardiac tamponade. Cardiac tamponade is caused by fluid trapped in the pericardial space, compressing the heart, compromising ventricular filling, and therefore cardiac output.1 Acute traumatic cardiac tamponade presents with chest pain and respiratory distress.2 Beck’s triad may be present on exam, as it was in our case: muffled heart sounds, distende