Adaptive Fuzzy Control of Mean Arterial Pressure in Critically-ill Patients

Author

Ying, Hao ; McEachern, Michael ; Eddleman, Donald W. ; Sheppard, Louis C.

Author_Institution

Department of Physiology and Biophysics, University of Texas Medical Branch, Galveston, TX 77555, USA; Biomedical Engineering Center, University of Texas Medical Branch, Galveston, TX 77555, USA; Office of Academic Computing, University of Texas Medical B

fYear

1993

fDate

2-4 June 1993

Firstpage

1845

Lastpage

1849

Abstract

A fuzzy control sodium nitroprusside delivery system was developed to closed-loop control mean arterial pressure (MAP) in postsurgical patients who exhibited high MAP following coronary artery bypass grafting procedures in a cardiac surgical intensive care unit. The core of the control system was a nonlinear adaptive PI controller, which precisely represented a simplest fuzzy controller. The proportional-gain and integral-gain adjusted continuously according to error and rate change of error of MAP. Twelve patients took part in the study. The length of time that the patients were on the fuzzy control system ranged from 1 hour 45 minutes to 18 hours 7 minutes. The total fuzzy-control-run time was 95 hours 13 minutes. The clinical results was satisfactory, since the average percentage of time in which MAP stayed between 90% and 110% of the MAP setpoint was 89.31%, with a standard deviation of 4.96%.

Keywords

Adaptive control; Arteries; Blood pressure; Control systems; Fuzzy control; Fuzzy systems; Nonlinear control systems; Pressure control; Programmable control; Surgery;

fLanguage

English

Publisher

ieee

Conference_Titel

American Control Conference, 1993

Conference_Location

San Francisco, CA, USA

Print_ISBN

0-7803-0860-3

Type

conf

Filename

4793197