An Application for Diagnosis by Chaotic Approach (An Application to Discrimination of Arrhythmia)
Tadashi Iokibe*, Masaya Koyama* and Toshifumi Sugiura**
*System Technology Division, Meidensha Corporation, Hakozaki 36-2, Nihonbashi, Chuo-ku, Tokyo, 103 Japan
**Research Institute of Electronics, Shizuoka University, Jyohoku 3-5-1, Hamamatsu, Shizuoka, 432 Japan
In a healthy state, the human heart beat shows an extensive spectrum and its attractor has a chaotic orbit. However, in a damaged state, fluctuations in the heart beat become periodical. An Implantable Cardioverter/Difibrillator (ICD), along with an implanted pace maker until in either the subcutaneous chest wall, or subpectoral or subcutaneous abdomen, or sub-muscles rectus abdominis serve to detect abnormalities and eliminate them quickly. The abnormalities affected include: ventricular fibrillation (non-regulated electrical activity in a ventricle) and other arrhythmia, such as ventricular tachycardia (VT) or supra ventricular tachycardia (SVT). There are two methods for detecting arrhythmia available with the present ICD. One is to investigate the heart beat or period, and the other is to investigate the electrocardiographic wave. However, the employment of these techniques, either singly or in combination, doesn’t always provide the required accuracy. This paper describes traditional analysis methods and the problems of ICD in brief. Subsequently, it discusses the chaotic approach. Finally, the results suitable for real testing, as well as future topics, are presented.