Extraction of the aortic and pulmonary components of the second heart sound using a nonlinear transient chirp signal model

Authors: Sun, Jingping; Durand, Louis-Gilles; Pibarot, Philippe
Abstract: The objective of this paper is to adapt and validate a nonlinear transient chirp signal modeling approach for the analysis and synthesis of overlapping aortic (A/sub 2/) and pulmonary (P/sub 2/) components of the second heart sound (S/sub 2/) The approach is based on the time-frequency representation of multicomponent signals for estimating and reconstructing the instantaneous phase and amplitude functions of each component. To evaluate the accuracy of the approach, a simulated S/sub 2/ with A/sub 2/ and P/sub 2/ components having different overlapping intervals (5-30 ms) was synthesized. The simulation results show that the technique is very effective for extracting the two components, even in the presence of noise (-15 dB). The normalized root-mean-squared error between the original A/sub 2/ and P/sub 2/ components and their reconstructed versions varied between 1% and 6%, proportionally to the duration of the overlapping interval, and it increased by less than 2% in the presence of noise. The validated technique was then applied to S/sub 2/ components recorded in pigs under normal or high pulmonary artery pressures. The results show that this approach can successfully isolate and extract overlapping A/sub 2/ and P/sub 2/ components from successive S/sub 2/ recordings obtained from different heartbeats of the same animal as well from different animals.
Document Type: Article de recherche
Issue Date: 1 March 2001
Open Access Date: Restricted access
Document version: VoR
Permalink: http://hdl.handle.net/20.500.11794/5468
This document was published in: IEEE Transactions on Biomedical Engineering, Vol. 48 (3), 277–283 (2001)
Institute of Electrical and Electronics Engineers
Alternative version: 10.1109/10.914790
Collection:Articles publiés dans des revues avec comité de lecture

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