<unk>  is a disorder in which the heart's<unk> icuspid valve does not close properly, causing blood to flow backward (leak) into the right upper heart chamber (atrium) when the right lower heart chamber (ventricle) contracts.
Tricuspid regurgitation
Aortic regurgitation
Mitral regurgitation
Pulmonic regurgitation
Mitral stenosis
Tricuspid stenosis
Aortic stenosis
Bicuspid aortic stenosis