• 検索結果がありません。

Myocardial function assessed by two-dimensional speckle-tracking echocardiography in dogs Abstract of Doctor Thesis Ryohei Suzuki Graduate school of Veterinary and Life Science Nippon Veterinary and Life Science University

N/A
N/A
Info
ダウンロード
Protected

Academic year: 2021

シェア "Myocardial function assessed by two-dimensional speckle-tracking echocardiography in dogs Abstract of Doctor Thesis Ryohei Suzuki Graduate school of Veterinary and Life Science Nippon Veterinary and Life Science University"

Copied!
3
0
0

読み込み中.... (全文を見る)

今ダウンロードする ( 3 ページ )

全文

(1)

Myocardial function assessed by two-dimensional speckle-tracking echocardiography in dogs

Abstract of Doctor Thesis

Ryohei Suzuki

Graduate school of Veterinary and Life Science

Nippon Veterinary and Life Science University

(2)

Two-dimensional speckle-tracking echocardiography (2D-STE) has recently been used to assess myocardial deformations in humans and dogs. This technique provides better quantification of regional and global myocardial deformations and might have higher sensitivity than conventional echocardiographic parameters for detecting subtle myocardial function abnormalities. However, the effect of age and heart rate (HR) on 2D-STE variables has not previously been reported.

Myxomatous mitral valve disease (MMVD) is the most common cardiac disease of dogs, and some dogs with MMVD develop myocardial dysfunction due to enlargement and remodeling of the heart. Recently, systolic dysfunction is associated with poor outcomes in dogs with MMVD. However, assessment of systolic function using conventional echocardiographic methods is difficult in mitral regurgitation (MR) owing to altered hemodynamic loading conditions and sympathetic tone.

We hypothesized that myocardial deformations assessed by 2D-STE could be useful markers of systolic dysfunction in dogs with MMVD. This study was designed to assess 1) the effect of HR and age on 2D-STE variables in healthy dogs, 2) multidirectional myocardial deformations derived by 2D-STE in dogs with various stages of MMVD, and 3) myocardial deformations during a dobutamine stress test with 2D-STE in dogs with experimentally induced chronic MR.

We confirmed that the effect of HR and age on myocardial function

assessed by 2D-STE in dogs. The present study obtained normal values

for 2D-STE variables in various HR and young and old dogs, and these

can be used as preliminary data for the establishment of reference

(3)

intervals of 2D-STE in the dog. This study also indicated that

multidirectional myocardial deformations could be assessed using

2D-STE to evaluate myocardial function of non-sedated dogs with

adequate repeatability. These multidirectional myocardial deformations

might improve the clinical assessment of cardiac function in dogs with

MMVD. As the torsion is directly related to helically-oriented

myocardial fibers, the lower torsion in dogs with severe MMVD may

contribute to latent systolic dysfunction. Finally, this study suggests

that contractile reserve assessed by dobutamine stress test with 2D-STE

is useful tool for early detection of the systolic dysfunction in dogs with

MR.

参照

今ダウンロードする ( PDF - 3 ページ - 42.80 KB )

関連したドキュメント

The Faculty of Economics and Business Administration Journal, KUAS, Vol.4, March * IN N=115 Ashley, J. B. et. A

Work Values, Occupational Engagement, and Professional Quality of Life in Counselors- in Training: Assessment in Constructivist- Based Career Counseling Course.. Development of

著者 山崎 智大, 池本  敏和, 吉田 成宏, 山口 裕通, 

＊2 Kanazawa University, Institute of Science and Engineering, Faculty of Geosciences and civil Engineering, Associate Professor. ＊3 Kanazawa University, Graduate School of

PARAMETRIZATION, AND OUTPUT TRACKING OF A LINEARIZED

An idea to use frequency-domain methods and certain pseudodifferential operators for parametrization of control systems of more general systems is pointed

ONE-DIMENSIONAL GAME OF LIFE AND

Nov, this definition includ.ing the fact that new stages on fundamental configuration begin at the rows 23 imply, no matter what the starting configuration is, the new stages

Validation of the Revised Stressful Life Event

The SLE-revised (SLE-R) questionnaire despite simplicity is a high-performance screening tool for investigating the stress level of life events and its management in both community

Finite automata and algebraic extensions of function fields

To complete the “concrete” proof of the “al- gebraic implies automatic” direction of Theorem 4.1.3, we must explain why the field of p-quasi-automatic series is closed

1.Introduction JingLu andDjebbarTiab Pseudo-Steady-StateProductivityFormulaforaPartiallyPenetratingVerticalWellinaBox-ShapedReservoir ResearchArticle

Taking a partially penetrating well as a uniform line sink in three dimensional space, by the orthogonal decomposition of Dirac function and using Green’s function to

IN RINGS OF DIFFERENTIAL OPERATORS by

The commutative case is treated in chapter I, where we recall the notions of a privileged exponent of a polynomial or a power series with respect to a convenient ordering,