According to the 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease, there are 4 stages of<unk>  stenosis based on the valve anatomy, valve hemodynamics, the left ventricular and vascular consequences of<unk>  obstruction, and the symptoms. The stages include at risk of AS, progressive hemodynamic obstruction, severe asymptomatic AS, and symptomatic AS.
Aortic stenosis classification
Left ventricular aneurysm classification
Aortic insufficiency classification of severity
Tricuspid stenosis classification
Tricuspid regurgitation classification
Mitral regurgitation classification
Heart murmur classification
European society of cardiology guidelines classification scheme