Abstract 3443: Can Mitral Valve Repair preserve the Left Ventricular Torsion better than Mitral Valve Replacement?
Recent studies reported that it is important to maintain not only systolic left ventricular (LV) function but also LV torsion after cardiac surgery. The technical innovation enabled to assess the left ventricular torsion by tissue tracking method of echocardiography and this method might be a potent procedure of evaluation of LV function. It is also well known that mitral valve repair (MVP) can maintain postoperative LV function. However, it remains unknown whether LV torsion may affect the systolic LV function or not after MVP.
Aim: To examine the relationship between systolic LV function and LV torsion after MVP in comparison with mitral valve replacement (MVR).
Method: Fifteen subjects who underwent MVP (9 male, 6 female, mean age 57.3 year-old) as group MVP, ten subjects who underwent MVR (6 male, 4 female, mean age 62.5 year-old) as group MVR, and normal fifteen subjects (10 male, 5 female, mean age 53.9 year-old) as group C were enrolled in this study. All of them were restored sinus rhythm and left LV ejection fraction over 40%. All subjects underwent transthoracic echocardiography using Sequoia 512 made by Siemens and recorded LV short axis image at apex and basal levels. LV ejection fraction was measured by Simpson method from apical view. Twist angle was measured by off-line Vector Velocity Imaging at each slice level, then LV torsion was calculated from the difference between basal and apical twist angle. These LV torsions were compared among studying groups.
Results: There was no significant difference of LV ejection fraction. LV torsion of group MVR was significantly lower than that of group MVP and group C (2.57 +/- 2.61 degree, 7.36 +/- 3.51 degree, 8.69 +/- 3.29 degree, p<0.05, p<0.05, respectively). There was no significant difference of LV torsion between group MVP and group C.
Conclusion: MVP may be a potent surgical procedure which can preserve not only LV function but LV torsion.