Title: Postoperative blood pressure control using gain-scheduling controller

Authors: H. Zheng, K.Y. Zhu

Addresses: School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore. ' School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore

Abstract: Postoperative hypertension is commonly found in cardiac patients, and untreated hypertension patients may develop severe complications. This paper presents a gain-scheduling control system for postoperative blood pressure management. The system is based on a controller bank designed a priori using multiple-model control. A tuning method, which can effectively select a suitable control output, is then adopted. Each controller in the controller bank is a non-linear Proportional-Integral (PI) controller. The proportional and integral gains of the controller are updated using the error and the change of the plant, so that a wide range of parameter changes and non-linearities of the plant can also be handled. In simulation study, a non-linear pulsatile-flow model is used. This model can accurately describe the patient|s plant. The simulation results show that the proposed gain-scheduling control system can effectively handle the changes in the patient|s dynamics and provide satisfactory control performance.

Keywords: gain-scheduling control; multiple-model control; blood pressure control; cardiovascular system; postoperative hypertension; healthcare; cardiac patients; blood pressure management; simulation; pulsatile flow modelling.

DOI: 10.1504/IJMIC.2006.012617

International Journal of Modelling, Identification and Control, 2006 Vol.1 No.4, pp.292 - 300

Published online: 27 Feb 2007 *

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