Noninvasive Clinical Assessment of Systolic Torsional Motions by Two-Dimensional Speckle-Tracking Echocardiography in Dogs with Myxomatous Mitral Valve Disease
Article first published online: 26 DEC 2012
Copyright © 2012 by the American College of Veterinary Internal Medicine
Journal of Veterinary Internal Medicine
Volume 27, Issue 1, pages 69–75, January/February 2013
How to Cite
Suzuki, R., Matsumoto, H., Teshima, T. and Koyama, H. (2013), Noninvasive Clinical Assessment of Systolic Torsional Motions by Two-Dimensional Speckle-Tracking Echocardiography in Dogs with Myxomatous Mitral Valve Disease. Journal of Veterinary Internal Medicine, 27: 69–75. doi: 10.1111/jvim.12024
- Issue published online: 11 JAN 2013
- Article first published online: 26 DEC 2012
- Manuscript Accepted: 24 OCT 2012
- Manuscript Revised: 13 SEP 2012
- Manuscript Received: 20 JUN 2012
- Mitral regurgitation;
- Myocardial function;
Left ventricular torsional motion plays an important role for effective pump function. However, noninvasive clinical assessment of torsional deformations by two-dimensional speckle-tracking echocardiography (2D-STE) in dogs with myxomatous mitral valve disease (MMVD) has not been reported.
Left ventricular torsion is determined by the native orientation of the helical myocardial fibers, such that it might provide better assessment of myocardial function than conventional methods.
Sixty-seven client-owned dogs with MMVD were classified into 3 classes based on the International Small Animal Cardiac Health Council classification and 16 weight- and age-matched healthy dogs.
Dogs were examined for myocardial deformations by 2D-STE and were evaluated for peak systolic rotation and rotation rate at each basal and apical view. Dogs also were evaluated for peak systolic torsion and torsion rate.
Peak systolic torsion was higher in class II than in class I (P < .001) dogs. Peak systolic torsion was lower in class III than in class II (P = .001) dogs and controls (P = .003).
Conclusions and Clinical Importance
Torsional deformations assessed by 2D-STE differed among clinical classes of MMVD. Myocardial torsional deformations by 2D-STE may provide more detailed assessment of contractile function in dogs with MMVD.