On M-mode imaging for mitral stenosis, what is the typical appearance of the mitral valve?

On M-mode imaging for mitral stenosis, what is the typical appearance of the mitral valve?

• A. Thickened MV leaflets
• B. Normal MV leaflets
• C. Prolapse
• D. Calcified aortic valve

Answer: (A)

Thickened MV leaflets. Mitral stenosis, usually from rheumatic disease, causes the mitral valve leaflets to become thickened and rigid with restricted motion. On M-mode this shows up as markedly thickened leaflets with reduced excursion and decreased separation during diastole, which is the hallmark finding. Normal leaflets, prolapse, or a calcified aortic valve describe other conditions and don’t fit the characteristic M-mode appearance of rheumatic mitral stenosis.

Thickened MV leaflets. Mitral stenosis, usually from rheumatic disease, causes the mitral valve leaflets to become thickened and rigid with restricted motion. On M-mode this shows up as markedly thickened leaflets with reduced excursion and decreased separation during diastole, which is the hallmark finding. Normal leaflets, prolapse, or a calcified aortic valve describe other conditions and don’t fit the characteristic M-mode appearance of rheumatic mitral stenosis.