Causes of aortic regurgitation
| Primary (valve apparatus) | ||
| Congenital | Bicuspid, quadricuspid | |
| Ventricular septal defect | ||
| Myxomatous | Fibroelastic deficiency | |
| Degenerative | Age-related | IIIB |
| Mucopolysaccharidoses | IIIA | |
| Inflammatory | Rheumatic | IIIA |
| Radiation (lymphoma, breast) | IIIA | |
| Drugs (dopamine agonists) | IIIA | |
| Infective endocarditis | IB | |
| Collagen vascular diseases | ||
| Secondary (aortic) | ||
| Congenital | Annuloaortic ectasia | I |
| Loezs-Dietz, Marfan, Ehlers-Danloss | I | |
| Acquired | Hypertension | I |
| Atherosclerotic | I | |
| Infection (syphilis) | I | |
| Inflammation (Takayasu) | I |