Journal ArticleDOI
Spectral analysis and acoustic transmission of mitral and aortic valve closure sounds in dogs. Part 2. Effects of neuromuscular blockade, sternotomy and pacemaker control, and a two-week recovery period.
Louis-Gilles Durand,Y. E. Langlois,T. Lanthier,R. Chiarella,P. Coppens,S. Carioto,S. Bertrand-Bradley +6 more
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In this article, the effects of neuromuscular blockade, sternotomy and atrio-ventricular pacing, and a two-week recovery period on the spectra and acoustic transmission of mitral M1 and aortic A2 sound components in dogs are described.Abstract:
The paper describes the effects of neuromuscular blockade, sternotomy and atrio-ventricular pacing, and a two-week recovery period on the spectra and acoustic transmission of mitral M1 and aortic A2 sound components in dogs. Results indicate that neuromuscular blockade does not affect the attenuation properties of the heart/thorax acoustic system even if it modifies the intensity of M1 and the phase of the transfer function. The immediate effect of sternotomy and cardiac pacing is an important increase in the attenuation of the heart/thorax acoustic system. This increased attenuation is different for both sounds (20 dB for M1 and 11 dB for A2) and disappears after a two-week recovery period. However, the resulting controlled dog model shows slightly different acoustic characteristics than those of the normal animal model.read more
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Nonlinear transient chirp signal modeling of the aortic and pulmonary components of the second heart sound
TL;DR: It is demonstrated that each component is a narrow-band signal with decreasing instantaneous frequency defined by its instantaneous amplitude and its instantaneous phase, which can be accurately represented by a polynomial having an order of thirty.
Journal ArticleDOI
Heart sounds and murmurs: changes related to severity of chronic valvular disease in the Cavalier King Charles spaniel.
TL;DR: Cardiac murmurs were present in 59 of the dogs and the intensity of the systolic cardiac murmur was correlated to the severity of CVD and to the echocardiographic dimensions of the heart (left atrial ratio, La/Ao-d, and left ventricular end diastolic diameter).
Journal ArticleDOI
Time-frequency analysis of the first heart sound
J.C. Wood,D.T. Barry +1 more
TL;DR: In this paper, the first heart sound is composed of valve-initiated myocardial traveling waves superimposed upon the acceleration of myocardium contraction, and it is shown that a better understanding of first-heart sound mechanics may facilitate the diagnosis of miocardial and native-valve pathology.
Journal Article
Non-linear fluid-coupled computational model of the mitral valve.
TL;DR: This model is the first coupled fluid-structure computational model of the mitral valve in which valvular kinematics result from the interaction of local blood flow and a continuum representation ofValvular microstructure.
Journal ArticleDOI
Cluster analysis and classification of heart sounds
TL;DR: In this article, a hierarchical clustering-based approach was proposed for identifying distinct morphologies of heart sounds and classifying them into physiological states based on the feature space of cluster distances and a classification algorithm.
References
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Book
Engineering Applications of Correlation and Spectral Analysis
TL;DR: This chapter discusses single-Input/Single-Output Relationships, nonstationary data analysis techniques, and procedures to Solve Multiple- Input/Multiple-Output Problems.
Journal ArticleDOI
Time-frequency representation of digital signals and systems based on short-time Fourier analysis
TL;DR: In this article, the authors developed a representation for discrete-time signals and systems based on short-time Fourier analysis and showed that a class of linear-filtering problems can be represented as the product of the time-varying frequency response of the filter multiplied by the short time Fourier transform of the input signal.
Journal ArticleDOI
A simple technique for production of chronic complete heart block in dogs.
C Steiner,A T Kovalik +1 more
Journal Article
Phonocardiogram signal analysis: a review.
Rangaraj M. Rangayyan,R J Lehner +1 more
TL;DR: The nature of the heart sound signal and the various signal-processing techniques that have been applied to PCG analysis are reviewed and some new research directions are outlined.