A method for the computational modeling of the physics of heart murmurs

JOURNAL OF COMPUTATIONAL PHYSICS

卷:336

Article

Seo, Jung Hee¹  Bakhshaee, Hani¹  Garreau, Guillaume²  Zhu, Chi¹  Andreou, Andreas²  Thompson, William R.³  Mittal, Rajat¹ 

[1] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA

[2] Johns Hopkins Univ, Dept Elect & Comp Engn, Baltimore, MD 21218 USA

[3] Johns Hopkins Univ, Sch Med, Baltimore, MD 21218 USA

关键词: Heart sound;    Cardiovascular flow;    Immersed boundary method;    Hemodynamics;    Elastic waves;    Systolic murmur;   

DOI  :  10.1016/j.jcp.2017.02.018

来源: Elsevier

【 摘 要 】

A computational method for direct simulation of the generation and propagation of blood flow induced sounds is proposed. This computational hemoacoustic method is based on the immersed boundary approach and employs high-order finite difference methods to resolve wave propagation and scattering accurately. The current method employs a two-step, one-way coupled approach for the sound generation and its propagation through the tissue. The blood flow is simulated by solving the incompressible Navier Stokes equations using the sharp-interface immersed boundary method, and the equations corresponding to the generation and propagation of the three-dimensional elastic wave corresponding to the murmur are resolved with a high-order, immersed boundary based, finite-difference methods in the time-domain. The proposed method is applied to a model problem of aortic stenosis murmur and the simulation results are verified and validated by comparing with known solutions as well as experimental measurements. The murmur propagation in a realistic model of a human thorax is also simulated by using the computational method. The roles of hemodynamics and elastic wave propagation on the murmur are discussed based on the simulation results. (C) 2017 Elsevier Inc. All rights reserved.

【 授权许可】

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