|A||At risk||Patients with risk factors for development of VHD|
|B||Progressive||Patients with progressive VHD (mild to moderate severity and asymptomatic)|
|C||Asymptomatic severe||Asymptomatic patients who meet criteria for severe VHD:|
|D||Symptomatic severe||Patients who have developed symptoms as a result of severe VHD|
Reproduced from Nishimura et al. (8).
VHD = valvular heart disease.