Heart valve surgery is a surgical procedure performed with the aim of repairing or replacing a damaged heart valve. The heart valve must be repaired if it has an abnormality that causes it to not function properly. Conditions that can cause heart valves to experience dysfunction are stiffness (stenosis) or leakage (regurgitation). The heart has 4 valves that function to regulate blood flow when the organ is pumping blood, and serves as a barrier to heart space. Among others are: Tricuspid valve. The tricuspid valve is the valve that forms the boundary between the right atrium (foyer) and the right ventricle (chamber) of the heart. Mitral valve. The mitral valve is the valve that forms the boundary between the left atrium and the left ventricle of the heart. Pulmonary valve. Pulmonary valve or valve of the lungs is a valve that regulates blood flow from the right ventricle to the arteries of the lungs. Aortic valve. Aortic valve is a valve that regulates blood flow from the l