Echocardiographic parameters correlate with the frequency spectra of the third heart sound, supporting a mass-spring model for its genesis.
Supports mass-spring model for S3 in observational data; leaves open diagnostic utility and prospective validation.
A study on the genesis of the third heart sound (S3) based on the mass-spring model is presented. In such a system the natural frequency of vibration depends on the stiffness constant and the mass according to a physical law. The amplitude versus frequency spectra of S3 of 19 patients were obtained using the FFT algorithm together with mono- and two-dimensional echocardiographic parameters. Each echo parameter was correlated with the relative energy contained in each of the 15 Hz bands in which the normalized average spectrum of S3 of each subject was divided. The relative energy of each band was related to echocardiographic parameters. Significant correlation coefficients were found between the diameter of the left ventricle measured at the end of the rapid filling phase. The thickness of the posterior wall and of the interventricular septum at this moment, and the energy contained in certain frequency bands. The statistical correlations we have revealed are consistent with the model postulated in our hypothesis.
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Longhini et al. (1989) studied this question.
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