A NEW ESTIMATION METHOD IDENTIFYING THE INITIAL BLOOD VOLUME DURING HEMOPURIFICATION

Abstract

We have developed a new method which estimates initial blood volume during hemopurification treatment based on observer system including a hemoglobinometer (Hb meter) and a body fluid model. In this Hb meter, a pair of optical devices is set to the extracoporeal blood circuit tube, which measures an incident light at photodiode through the blood. The body fluid model adoped here consists from simplified three compartments. This estimation method is a new method which can identify the initial blood volume only by measuring the incident light through the blood without blood sampling. By using this method, the blood volume change can be observed as not only the relative volume but the absolute volume.