Time-frequency and complexity analyses for differentiation of physiologic murmurs from heart murmurs caused by aortic stenosis in Boxers

To investigate whether time-frequency and complexity analyses of heart murmurs can be used to differentiate physiologic murmurs from murmurs caused by aortic stenosis (AS) in Boxers. 27 Boxers with murmurs. Dogs were evaluated via auscultation and echocardiography. Analyses of time-frequency propert...

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Bibliographic Details
Published in:	American journal of veterinary research Vol. 68; no. 9; pp. 962 - 969
Main Authors:	Hoglund, K, Ahlstrom, C.H.G, Haggstrom, J, Ask, P.N.A, Hult, P.H.P, Kvart, C
Format:	Journal Article
Language:	English
Published:	United States 01-09-2007
Subjects:	adults animal age Animals aorta aortic stenosis Aortic Valve Stenosis - diagnosis Aortic Valve Stenosis - diagnostic imaging Aortic Valve Stenosis - physiopathology Aortic Valve Stenosis - veterinary Boxer Data Interpretation, Statistical diagnostic techniques disease diagnosis dog diseases Dog Diseases - diagnosis Dog Diseases - diagnostic imaging Dog Diseases - physiopathology Dogs echocardiography Echocardiography, Doppler, Color - veterinary Female frequency Heart Auscultation - veterinary heart diseases heart murmurs Heart Murmurs - diagnosis Heart Murmurs - diagnostic imaging Heart Murmurs - physiopathology Heart Murmurs - veterinary heart sounds heart valves Male pets phonocardiography puppies TECHNOLOGY TEKNIKVETENSKAP
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Summary:	To investigate whether time-frequency and complexity analyses of heart murmurs can be used to differentiate physiologic murmurs from murmurs caused by aortic stenosis (AS) in Boxers. 27 Boxers with murmurs. Dogs were evaluated via auscultation and echocardiography. Analyses of time-frequency properties (TFPs; ie, maximal murmur frequency and duration of murmur frequency > 200 Hz) and correlation dimension (T(2)) of murmurs were performed on phonocardiographic sound data. Time-frequency property and T(2) analyses of low-intensity murmurs in 16 dogs without AS were performed at 7 weeks and 12 months of age. Additionally, TFP and T(2) analyses were performed on data obtained from 11 adult AS-affected dogs with murmurs. In dogs with low-intensity murmurs, TFP or T(2) values at 7 weeks and 12 months did not differ significantly. For differentiation of physiologic murmurs from murmurs caused by mild AS, duration of murmur frequency > 200 Hz was useful and the combination assessment of duration of frequency > 200 Hz and T(2) of the murmur had a sensitivity of 94% and a specificity of 82%. Maximal murmur frequency did not differentiate dogs with AS from those without AS. Results suggested that assessment of the duration of murmur frequency > 200 Hz can be used to distinguish physiologic heart murmurs from murmurs caused by mild AS in Boxers. Combination of this analysis with T(2) analysis may be a useful complementary method for diagnostic assessment of cardiovascular function in dogs.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0002-9645 1943-5681 1943-5681
DOI:	10.2460/ajvr.68.9.962