Heart Valve Surgery Overview Heart valve surgery is an operation that fixes or replaces one or more of the four valves in your heart. Your valves, located between your heart’s four chambers, keep your blood moving the right way. Valves act like doors that open and close with each heartbeat, letting blood flow in and out of the chambers. When valves are working right, your blood should flow through your heart in one direction each time your heart beats. Your four heart valves are: Tricuspid , between your right upper and lower chambers. Pulmonary, between your right ventricle (lower chamber) and your pulmonary artery. Mitral, between your left upper and lower chambers. Aortic, between your left ventricle (lower chamber) and your aorta. Some of the blood may go back to the chamber or room it just left. Other times, a valve may become narrow, which may prevent blood from moving forward. This is a problem because it keeps your heart from working efficiently. Although heart valve surgery...