| Mitral opening snap |
| Organic mitral stenosis |
| Rarely, pure mitral regurgitation |
| Tricuspid opening snap |
| Organic tricuspid stenosis |
| Functional tricuspid stenosis (rare) |
| Atrial septal defect |
| "Tumor plop" |
| Left atrial myxoma |
| Right atrial myxoma |
| Opening clicks of mitral stenosis |
| Mitral valve prolapse |
