- Heart beat is audible as the Pericardium comes in contact with mediastinal air (Mediastinal Emphysema)
- Crunching sound over the precordium synchronized with the heartbeat (especially in left lateral decubitus position)
- Pneumomediastinum or pneumopericardium
- Tracheobronchial tree injury
- Esophageal Rupture
- Left Spontaneous Pneumothorax