Spectral analysis of second heart sound in normal children by selective linear prediction coding

Nandagopal, D.; Mazumdar, J.; Bogner, R.E.; Goldblatt, E.

doi:10.1007/bf02442748

Cited by 7 publications

(5 citation statements)

References 24 publications

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“…The following parameters were considered: a) left atrial volume, employing the monoplane ellipsoid formula16) using the transverse and longitudinal left atrial diameters from parasternal and apical four-chamber views; The echocardiographic parameters were correlated with relative energy in the frequency bands.19), 20) d) Statistics Statistical analysis was accomplished using linear regression analysis and standard programs. The echocardiographic parameters were correlated among themselves and with the relative energy in each frequency band.…”

Section: Discussionmentioning

confidence: 99%

A mass-spring model hypothesis of the genesis of the physiological third heart sound.

et al. 1989

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Section: Discussionmentioning

confidence: 99%

A mass-spring model hypothesis of the genesis of the physiological third heart sound.

et al. 1989

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“…For each of these bands, the area under the curve of the spectrum was calculated using a trapezoi dal technique and assumed as an index of the energy contained in the band. This area was normalized with respect to the total area of the curve of the entire spectrum [12][13][14],…”

Section: Methodsmentioning

confidence: 99%

Clinical Value of the Pitch of the Third Heart Sound in Ischemic Heart Disease

Aggio

Baracca²,

Brunazzi³

et al. 1990

Cardiology

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The study investigates the genesis of the third heart sound (S3) in ischemic heart disease based on a mass-spring model. In such a system, the natural frequency of vibration, Fn, depends on the elastic constant, k, and the mass, m, according to the following relationship: Fn = 1/2 π k/m. To identify the cardiac structures representing k and m, the correlations between the energy of the S3 spectrum and the echocardiographic parameters were searched for. The results are consistent with a model in which k is represented by the thickness of the left ventricle and m by its blood content. The k/m ratio emerges as an important determining factor of the acoustic quality of S3, and yields information on the dysfunction of the left ventricle in ischemic heart disease.

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“…A similar approach was used by Hearn et al [15] and Nandagopal et al [16] in their studies on first and second heart sounds respectively and by Ewing et al [17,18] on the third heart sound.…”

Section: Discussionmentioning

confidence: 97%

The Genesis of the Opening Snap in Mitral Stenosis: Correlations between Spectral Analysis and Echocardiographic Data

Longhini¹,

Toselli²,

Baracca³

et al. 1987

Am J Noninvas Cardiol

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In an effort to clarify the genesis of the opening snap (OS) of mitral stenosis (MS), the frequency versus amplitude spectra of OS of 30 patients were obtained using the FFT algorithm together with mono- and twodimensional échocardiographie parameters. Each echo parameter was correlated with the relative energy contained in each of the 20-Hz bands in which the normalized average spectrum of OS of each subject was divided. Out of these echo parameters, only left atrial volume, mitral valve area, septal and posterior left ventricular diastolic slopes showed significant correlations with the phonocardiographic signal. Besides the role of the valvular apparatus, the size of the left atrium seems to be the most important factor. The left atrium with the blood it contains appears to represent the mass of a mass-spring system which is maximally decelerated rendering manifest the forces generating the vibrations when the stenotic valve suddenly blocks the blood flow.

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Spectral analysis of second heart sound in normal children by selective linear prediction coding

Cited by 7 publications

References 24 publications

A mass-spring model hypothesis of the genesis of the physiological third heart sound.

A mass-spring model hypothesis of the genesis of the physiological third heart sound.

Clinical Value of the Pitch of the Third Heart Sound in Ischemic Heart Disease

The Genesis of the Opening Snap in Mitral Stenosis: Correlations between Spectral Analysis and Echocardiographic Data

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