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Exploring better methods to preserve the chordae tendineae during mitral valve replacement
M Komeda1, A DeAnda, J R Glasson
1Department of Cardiovascular and Thoracic Surgery, Stanford University School of Medicine, California 94305-5247, USA.
The Annals of Thoracic Surgery
|December 1, 1995
Summary
The oblique method for resuspending mitral chordae tendineae during valve replacement showed the best left ventricular (LV) systolic function. However, the counter technique impaired diastolic function, suggesting further research is needed for optimal LV performance preservation.
Area of Science:
- Cardiovascular Surgery
- Cardiac Mechanics
- Surgical Techniques
Background:
- Optimal preservation of mitral chordae tendineae during mitral valve replacement is crucial for postoperative left ventricular (LV) function.
- Current techniques for chordal resuspension lack established best practices for maximizing LV systolic and diastolic performance.
Purpose of the Study:
- To compare the efficacy of six different techniques for resuspending mitral chordae tendineae in preserving LV systolic and diastolic function post-mitral valve replacement.
- To identify the optimal chordal resuspension strategy for maintaining cardiac performance.
Main Methods:
- Six techniques (conventional, anterior, partial, posterior, oblique, counter) for chordal preservation were evaluated in 12 canine models.
- A nondistorting isovolumic preparation technique was employed, with control measurements taken between each experimental condition.
Main Results:
- The oblique method demonstrated the best LV systolic function (Emax = 4.0 +/- 1.8 mm Hg/mL) compared to the conventional method (3.3 +/- 1.2 mm Hg/mL).
- The posterior method exhibited the best diastolic LV performance (LV diastolic stiffness = 0.46 +/- 0.23 mm Hg/mL), while the counter method showed impaired diastolic properties (0.65 +/- 0.37 mm Hg/mL).
Conclusions:
- In canine models, the oblique chordal resuspension technique was associated with superior LV systolic function.
- The counter technique negatively impacted LV diastolic function, highlighting the importance of chordal orientation in preserving overall LV performance after mitral valve replacement.