#valvular_heart_disease  heart disease caused by stenosis of the cardiac valves and obstructed blood flow or caused by degeneration and blood regurgitation
  supertype:  #heart_disease__heartdisease__heart_condition__heartcondition__cardiopathy  a disease of the heart
  subtype:  #aortic_stenosis  abnormal narrowing of the aortic valve
  subtype:  #mitral_valve_prolapse  cardiopathy resulting from the mitral valve not regulating the flow of blood between the left atrium and left ventricle of the heart
  subtype:  #mitral_stenosis__mitral_valve_stenosis  obstruction or narrowing of the mitral valve (as by scarring from rheumatic fever)

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