Mitral and Atrial Regurgitation Explained with Simple Animations

The heart contains four valves that ensure blood flows in the correct direction.We'll focus on the mitral valve between the left atrium and ventricle, and the tricuspid valve between the right atrium and ventricle.During the cardiac cycle, the valves open to allow blood flow from the atria to the ventricles.When the valves close, they create the characteristic lub sound.And when the semilunar valves close, we hear the dub sound.Each valve has special structures that ensure proper closure. The leaflets are supported by string-like chordae tendineae, which prevent the valve from opening backward.When functioning normally, the valve leaflets come together perfectly, preventing any backward flow of blood.In mitral valve regurgitation, the valve between the left atrium and ventricle fails to close properly.During ventricular contraction, blood should normally flow forward into the aorta. However, with mitral regurgitation, some blood leaks backward into the left atrium.One common cause is valve prolapse, where the valve leaflets bulge backward into the atrium.The supporting structures, called chordae tendineae, can become damaged or stretched, preventing proper valve closure.This backflow creates a characteristic whooshing sound, known as a systolic murmur.Over time, this constant backflow causes the left atrium to enlarge as it handles extra blood volume.Now let's examine regurgitation in the right side of the heart, focusing on the tricuspid and pulmonary valves.In tricuspid regurgitation, blood flows backward from the right ventricle into the right atrium during contraction.This backflow can cause the jugular veins in the neck to become distended and visible.Treatment options include medications to reduce fluid buildup and improve heart function.For severe cases, surgical options include valve repair or replacement to restore proper blood flow.