What is mitral stenosis? 

Mitral stenosis is narrowing of the valve between the left atrium and left ventricle. Left atrium is the left upper chamber which receives oxygenated blood from the lungs. Left ventricle is the lower muscular chamber of the heart which pumps oxygenated blood to the whole body. Mitral stenosis is usually a sequelae of rheumatic fever, a disease which affects the major joints and heart valves. Another form of mitral stenosis is due to calcification of the mitral valve base, seen in elderly.