Author(s)

Wei-Ling Chen^1,2, Chung-Dann Kan³, Chia-Hung Lin^4*

¹Department of Biomedical Engineering, National Cheng Kung University, Tainan City.
²Department of Engineering and Maintenance, Kaohsiung Veterans General Hospital, Kaohsiung City.
³Department of Surgery, National Cheng Kung University Hospital, Tainan City.
⁴Department of Electrical Engineering, Kao-Yuan University, Kaohsiung City.

This paper proposes the evaluation of arteriovenous shunt (AVS) stenosis using a fractional-order Fuzzy Petri net based screening system for long-term hemodialysis treatment of patients. The screening system uses the Burg method, the fractional-order chaos system, and the Fuzzy Petri net (FPN) for early detection of AVS dysfunction. The Burg method is an autoregressive (AR) model that is used to estimate the frequency spectra of a phonoangiographic signal and to identify the spectral peaks in the region from 25 Hz to 800 Hz. In AVS, the frequency spectrum varies between normal blood flow and turbulent flow. The power spectra demonstrate changes in frequency and amplitude as the degree of stenosis changes. A screening system combining fractional-order chaos system and FPN is used to track the differences in the frequency spectra between the normal and stenosis access. The dynamic errors are indexes that can be used to evaluate the degree of AVS stenosis using a FPN. For 42 long-term follow-up patients, testing results show that the proposed screening system is more efficient in the evaluation of AVS stenosis.

Arteriovenous Shunt (AVS); Fractional-Order Self-Synchronization Error; Burg Method; Phonoangiographic Signal; Fuzzy Petri Net (PN)

Chen, W. , Kan, C. and Lin, C. (2014) Arteriovenous Shunt Stenosis Evaluation Using a Fractional-Order Fuzzy Petri Net Based Screening System for Long-Term Hemodialysis Patients. Journal of Biomedical Science and Engineering, 7, 258-275. doi: 10.4236/jbise.2014.75029.