Open AccessProjection and Simulation Results of an Adaptive Fuzzy Control Module for Blood Pressure and Blood Volume During Hemodialysis
Author(s) -
Maurizio Nordio,
Silvio Giove,
S Lorenzi,
P Marchini,
Fabio Mirandoli,
E Saporiti
Publication year - 1994
Publication title -
asaio journal
Language(s) - English
Resource type - Journals
eISSN - 1538-943X
pISSN - 1058-2916
DOI - 10.1097/00002480-199407000-00086
Subject(s) - fuzzy logic , control theory (sociology) , volume (thermodynamics) , fuzzy control system , hemodialysis , blood pressure , pressure control , mathematics , dialysis , adaptive control , blood volume , computer science , control (management) , surgery , artificial intelligence , engineering , medicine , anesthesia , mechanical engineering , physics , quantum mechanics
This paper proposes a fuzzy logic based procedure able to control the behavior of a patient's blood pressure during a dialysis session, allowing him to reach the planned dry weight. A proportional integrative discrete-time fuzzy control is used to subject the controlled variables (blood pressure and blood volume) to the reference values. Two different tables that refer to pressure and volume errors and rates are consulted and the proposed control actions are taken to obtain the final value (net ultrafiltration rate). A saturation-threshold function of volemia acts on the second control variable, Na concentration in the dialysate. The adaptive control system was simulated on an IBM PC, and rules and terms were expressed by linguistic judgments such as: IF "situation," THEN "action." A pre processor converts the rules into the numerical values in the tables. The obtained simulation results are satisfactory, and the introduction of Na control allows achievement of the target dry weight of the patient with a stable blood pressure.