Abnormal chordal insertion: a cause of mitral valve prolapse

Area of Science:

• Cardiovascular Research
• Cardiac Surgery
• Pathology

Background:

• Mitral valve prolapse (MVP) is a common cardiac condition.
• While leaflet morphology is known, chordal abnormalities in MVP require further investigation.

Purpose of the Study:

• To investigate the detailed morphology of mitral valve chordae in patients with MVP.
• To compare chordal arrangement and insertion patterns between MVP and control valves.

Main Methods:

• Retrospective review of 23 surgically-excised MVP valves and 10 control valves.
• Morphological measurements and two-dimensional echocardiograms (2DE) were utilized.
• Analysis of leaflet length, annular diameter, and chordal distribution patterns.

Main Results:

• MVP valves exhibited significantly larger anterior and posterior leaflets and mitral annuli compared to controls.
• Increased chordal divisions (4.2 in MVP vs. 3.1 in controls) were observed.
• Abnormal chordal insertion and random distribution were the most striking features in MVP.

Conclusions:

• Abnormal chordal architecture, including insertion and distribution, is a key feature of MVP.
• Unequal stress on valve leaflets due to aberrant chordal structure may contribute to MVP development.
• Further research into chordal mechanics is warranted for MVP understanding.