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Distance between mitral anulus and papillary muscles: anatomic study in normal human hearts
1Department of Cardiovascular Surgery, Tenri Hospital, Nara, Osaka, Japan. tedsakai@hotmail.com
The Journal of Thoracic and Cardiovascular Surgery
|October 3, 1999
Summary
Restoring annulo-papillary muscle continuity during mitral valve surgery is crucial. This study measured distances in cadaveric hearts, finding consistent annulo-papillary muscle lengths that correlate with mitral annular diameter.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anatomy
- Mitral Valve Repair
Background:
- Preserving annulo-papillary muscle continuity is vital in mitral valve replacement.
- Restoration is possible even after mitral apparatus excision, but resuspension length guidance is lacking.
Purpose of the Study:
- To establish standard annulo-papillary muscle distances for mitral valve reconstruction.
- To provide anatomical data for surgical resuspension techniques.
Main Methods:
- Direct measurement of distances from papillary muscle tips to mitral annulus landmarks in 57 normal cadaveric hearts.
- Measurements taken at 2-, 4-, 8-, and 10-o'clock positions.
Main Results:
- Annulo-papillary muscle distances were consistent across the four measured positions (approx. 23.5 mm).
- These distances were significantly longer than corresponding chordae tendineae lengths.
- A significant correlation was found between mean annulo-papillary distance and mitral annular diameter.
Conclusions:
- Annulo-papillary muscle distances in normal hearts are uniform at key positions.
- These distances are related to the overall size of the mitral annulus.
- Findings offer a basis for guiding papillary muscle resuspension length in mitral valve surgery.