Final answer:
In pure rheumatic mitral valve stenosis, the left atrium is increased and the left ventricle is normal or unchanged.
Step-by-step explanation:
In pure rheumatic mitral valve stenosis, the left atrium is increased and the left ventricle is normal or unchanged.
Mitral valve stenosis is a condition where the mitral valve (also known as the bicuspid valve or left atrioventricular valve) becomes narrowed, leading to reduced blood flow from the left atrium to the left ventricle. As a result, the left atrium has to work harder to pump blood through the narrowed valve, causing it to become enlarged. The left ventricle, on the other hand, can be normal or unchanged in size.