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The left ventricle in dogs with myxomatous mitral valve disease

remodeling and overall performance

Ljungvall, Ingrid (2011). The left ventricle in dogs with myxomatous mitral valve disease. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2011:53
ISBN 978-91-576-7597-2
[Doctoral thesis]

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Abstract

The concept of left ventricular (LV) remodeling in dogs with myxomatous mitral valve disease (MMVD) includes changes in the LV occurring in response to mitral regurgitation (MR). The general aim of this thesis was to study LV remodeling and function in dogs with different severities of naturally acquired MMVD using 1) digital signal analysis technique for murmur and heart sound assessment, 2) biomarker analyses of circulating cardiac troponin I (cTnI), C-reactive protein (CRP), and matrix metalloproteinases (MMPs), and 3) real-time three-dimensional (RT3D) echocardiography for assessment of changes in LV shape and volume.
Digital linear and nonlinear analyses (using seven different sound variables) of cardiac sounds showed that more severe MR produced a murmur of “harsher” quality, longer duration, and with more complexity in the signal. The energy of the first heart sound was not associated with MR severity (assessed by echocardiography), whereas the energy of the second heart sound decreased with increasing MR severity. Biomarker assessments showed circulating (cTnI) concentration to increase with increasing disease severity, whereas circulating C-reactive protein (CRP) concentration was not associated with disease severity. Neither MMP-2 nor -9 were associated with the MMVD severity groups (which was mainly based on volume overload status), however, MMP-9 activity decreased with worsening systolic function. The RT3D echocardiographic examinations showed prominent LV volume expansions only in dogs with more severe MMVD. The mid LV segment contributed the most to the global volume increase. The LV shape changed from elliptical to more globular in response to increasing volume overload, with the basal and apical segments contributing the most to the increase in sphericity.
In conclusion, the findings in the present thesis provide data that might contribute to the understanding of the complex pathophysiology of MMVD; thereby potentially impacting both clinical management and prediction of outcome for affected dogs in the future.

Authors/Creators:Ljungvall, Ingrid
Title:The left ventricle in dogs with myxomatous mitral valve disease
Subtitle:remodeling and overall performance
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :May 2011
Volume:2011:53
Number of Pages:93
Papers/manuscripts:
NumberReferences
ILjungvall I, Ahlstrom C, Höglund K, Hult P, Kvart C, Borgarelli M, Ask P, Häggström J. 2009. Use of signal analysis of heart sounds and murmurs to assess mitral valve regurgitation attributable to myxomatous mitral valve disease in dogs. American Journal of Veterinary Research, 70, 604-613.
IILjungvall I, Höglund K, Tidholm A, Olsen LH, Borgarelli M, Venge P, Häggström J. 2010. Cardiac troponin I is associated with severity of myxomatous mitral valve disease, age, and C-reactive protein in dogs. Journal of Veterinary Internal Medicine, 24:153-159.
IIILjungvall I, Rajamäki MM, Crosara S, Olsen LH, Kvart C, Borgarelli M, Höglund K, Häggström J Matrix metalloproteinase-9 is associated with systolic function in dogs with myxomatous mitral valve disease. American Journal of Veterinary Research. In press.
IVLjungvall I, Höglund K, Carnabuci C, Tidholm A, Häggström J. Assessment of global and regional left ventricular volume and shape using real-time-three-dimensional echocardiography in dogs with myxomatous mitral valve disease. Revised manuscript.
Place of Publication:Uppsala
Publisher:Institutionen för kliniska vetenskaper, Sveriges lantbruksuniversitet
ISBN for printed version:978-91-576-7597-2
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L73 Animal diseases
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Pathobiology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Clinical Science
Agrovoc terms:dogs, heart ventricles, heart diseases, myxomatosis, echocardiography
Keywords:cardiology, myxomatous mitral valve disease, echocardiography, heart disease, biomarkers, sound analysis, heart murmur, 3 D ultrasound
URN:NBN:urn:nbn:se:slu:epsilon-e-118
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-118
ID Code:8164
Department:(VH) > Dept. of Clinical Sciences
External funders:["funders_typename_SLU.id.fund-slu" not defined]
Deposited By: Dr Ingrid/ IL Ljungvall
Deposited On:07 Jun 2011 10:59
Metadata Last Modified:02 Dec 2014 10:46

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