Mitral stenosis does not pass which part of the heart?

Mitral stenosis does not pass which part of the heart?

• A. Papillary muscles
• B. Left atrial wall
• C. Chordae tendineae
• D. Atrial septum

Answer: (A)

Mitral stenosis narrows the opening between the left atrium and the left ventricle, so the forward flow must pass through the mitral valve orifice during diastole. The papillary muscles are muscular projections inside the left ventricle that anchor the valve leaflets via the chordae tendineae to prevent prolapse; they are not a conduit for blood. Blood moves from the left atrium into the left ventricle through the valve itself, not through the papillary muscles. The left atrial wall and the atrial septum are boundaries, not channels for this flow, and the chordae tendineae are tethering cords, not pathways. Therefore, the structure the flow does not pass through in this context is the papillary muscles.

Mitral stenosis narrows the opening between the left atrium and the left ventricle, so the forward flow must pass through the mitral valve orifice during diastole. The papillary muscles are muscular projections inside the left ventricle that anchor the valve leaflets via the chordae tendineae to prevent prolapse; they are not a conduit for blood. Blood moves from the left atrium into the left ventricle through the valve itself, not through the papillary muscles. The left atrial wall and the atrial septum are boundaries, not channels for this flow, and the chordae tendineae are tethering cords, not pathways. Therefore, the structure the flow does not pass through in this context is the papillary muscles.