The anatomy of the mitral valve is described using which nomenclature?

• A. Smith nomenclature
• B. Binet nomenclature
• C. Mitchell nomenclature
• D. Carpentier nomenclature

Answer: (D)

Carpentier nomenclature describes mitral valve anatomy and pathology by how the leaflets move, which is exactly what ultrasound observations focus on when assessing MR. This system groups leaflet motion into three broad patterns that directly relate to the mechanism of regurgitation and to repair planning.

• Type I: normal leaflet motion, with MR due to an enlarged annulus, perforation, or other lesions that don’t alter how the leaflets themselves move.

• Type II: excessive leaflet motion, such as prolapse or flail, where one or more leaflets move beyond normal excursion.

• Type III: restricted leaflet motion, with subtypes IIIa and IIIb. IIIa involves restriction that affects the leaflets in diastole (often rheumatic changes), while IIIb involves restriction primarily in systole (often due to ischemic or tethered leaflets).

This framework is preferred because it links what you see on echo to the underlying structures involved (leaflets, chordae, papillary muscles) and helps guide the repair strategy. Other named systems aren’t the standard reference used to describe mitral valve anatomy in clinical practice.