Title: Adaptive neuro-fuzzy system as a novel approach for predicting post-dialysis urea rebound

Authors: Ahmad Taher Azar

Addresses: Department of Electrical Communication and Electronics Systems Engineering, Modern Science and Arts University (MSA), 26 July Mehwar Road Intersection with Wahat Road, 6th of October City, Egypt

Abstract: Total dialysis dose (Kt/V) is considered to be a major determinant of morbidity and mortality in haemodialysed patients. The continuous growth of the blood urea concentration over the 30–60-min period following dialysis, a phenomenon known as urea rebound, is a critical factor in determining the true dose of haemodialysis (HD). The misestimation of the equilibrated (true) post-dialysis blood urea or equilibrated Kt/V results in an inadequate HD prescription, with predictably poor clinical outcomes for the patients. The estimation of the equilibrated post-dialysis blood urea (C_eq) is therefore crucial in order to estimate the equilibrated (true) Kt/V. Measuring post-dialysis urea rebound (PDUR) requires a 30- or 60-min post-dialysis sampling, which is inconvenient. This paper presents a novel technique for predicting equilibrated urea concentration and PDUR in the form of a Takagi–Sugeno–Kang fuzzy inference system. The advantage of this neuro-fuzzy hybrid approach is that it does not require 30–60-min post-dialysis urea sample. Adaptive neuro-fuzzy inference system (ANFIS) was constructed to predict equilibrated urea (C_eq)taken at 60 min after the end of the HD session in order to predict PDUR. The accuracy of the ANFIS was prospectively compared with other traditional methods for predicting equilibrated urea (C_eq), PDUR and equilibrated dialysis dose (_eqKt/V). The results are highly promising, and a comparative analysis suggests that the proposed modelling approach outperforms other traditional urea kinetic models.

Keywords: neural networks; Takagi–Sugeno–Kang FIS; TSK fuzzy inference system; ANFIS; adaptive neuro-fuzzy inference system; Ceq; equilibrated urea concentration; PDUR; post-dialysis urea rebound; equilibrated dialysis adequacy; haemodialysis; fuzzy logic; total dialysis dose; blood urea concentration; modelling.

DOI: 10.1504/IJISTA.2011.040352

International Journal of Intelligent Systems Technologies and Applications, 2011 Vol.10 No.3, pp.302 - 330

Received: 26 Oct 2010
Accepted: 11 Jan 2011
Published online: 24 May 2011 *

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