title: [Analysis of the heart sound with arrhythmia based on nonlinear chaos theory].
abstract: In this paper, a new method based on the nonlinear chaos theory was proposed to study the arrhythmia with the combination of the correlation dimension and largest Lyapunov exponent, through computing and analyzing these two parameters of 30 cases normal heart sound and 30 cases with arrhythmia. The results showed that the two parameters of the heart sounds with arrhythmia were higher than those with the normal, and there was significant difference between these two kinds of heart sounds. That is probably due to the irregularity of the arrhythmia which causes the decrease of predictability, and it's more complex than the normal heart sound. Therefore, the correlation dimension and the largest Lyapunov exponent can be used to analyze the arrhythmia and for its feature extraction.
authors.affiliation: College of Bioengineering, Chongqing University, Chongqing 400044, China.
authors.forename: Xiaorong
authors.initials: X
authors.lastname: Ding
authors.forename: Xingming
authors.initials: X
authors.lastname: Guo
authors.forename: Lisha
authors.initials: L
authors.lastname: Zhong
authors.forename: Shouzhong
authors.initials: S
authors.lastname: Xiao
mesh_terms: D001145:Arrhythmias, Cardiac / Q000175:diagnosis / Q000503:physiopathology*; D006347:Heart Sounds / Q000502:physiology*; D006801:Humans; D016015:Logistic Models; D017711:Nonlinear Dynamics; D010701:Phonocardiography; D012815:Signal Processing, Computer-Assisted