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Biventricular pacing has two primary (electrical) effects on the heart; the first effect is the change in atrioventricular (A-V) interval, which influences the timing of atrial contraction relative to ...

Mitral valve regurgitation is a heart condition that occurs when the mitral valve does not close properly, allowing blood to flow backward into the left atrium. Symptoms do not always occur. When they ...

The mitral valve allows blood to flow from the left atrium of the heart into the left ventricle. Mitral regurgitation occurs when the mitral valve leaks blood back into the left atrium. A person’s ...

The mitral valve is inside a person’s heart. A person with mitral valve disease may require mitral valve repair surgery as a treatment. A person’s heart contains four chambers. The two upper chambers ...