Noninvasive Clinical Assessment of Systolic Torsional Motions by Two-Dimensional Speckle-Tracking Echocardiography in Dogs with Myxomatous Mitral Valve Disease

Background 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...

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Bibliographic Details
Published in:Journal of veterinary internal medicine 2013-01, Vol.27 (1), p.69-75
Main Authors: Suzuki, R., Matsumoto, H., Teshima, T., Koyama, H.
Format: Article
Language:English
Subjects:
Animals
Biomechanical Phenomena
Cardiology
Cardiovascular disease
Dog Diseases - classification
Dog Diseases - diagnostic imaging
Dog Diseases - physiopathology
Dogs
Doppler effect
Echocardiography - methods
Echocardiography - veterinary
Female
Heart - physiology
Heart failure
Male
Mechanics
Mitral regurgitation
Mitral Valve Prolapse - classification
Mitral Valve Prolapse - diagnostic imaging
Mitral Valve Prolapse - physiopathology
Mitral Valve Prolapse - veterinary
Myocardial function
Rotation
Systole
Torsion
Torsion Abnormality - diagnostic imaging
Torsion Abnormality - veterinary
Ultrasonic imaging
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Summary:Background 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. Hypothesis 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. Animals 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. Methods 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. Results Peak systolic torsion was higher in class II than in class I (P 
ISSN:0891-6640
1939-1676
DOI:10.1111/jvim.12024