Abstract
The optimum dialysate Na concentration in a high Na dialysis system can be determined theoretically by the compartment model of solute and water removal. But, as the Na concentration is affected by the individual difference, the food intake during a dialysis, and by the psycological status of patients, it is thought neccessary to make a feedback of biological informations of a patient to the system.
A feedforward-feedback controled high Na dialysis was developed: the Na concentration was determined by the filtration rate as a feedforward control, and by the blood pressure as a feedback control. The blood pressure was monitord with ICU dialysis system which is conected to the high Na dialysis system. Thus, the blood pressure was maintained within a nomal limit.
