Assessment of a change of blood volume during hemodialysis

Hemodialysis influences intradialytic hypotension, decreasing the blood volume (BV) in circulation. If intradialytic hypotension has continued, the patient may occur an unconscious. In this study, we focused on the changes of the BV in circulation to prevent them from intradialytic hypotension and unconscious. Based of hematocrit value correlate with the reflected light intensity from blood, we estimated BV. We constructed the mathematical model to explain the water movement from the extracellular to the intravascular compartment during hemodialysis. As a result, the changing pattern of BV differed on each patient, a coefficient of the water movement were estimated in this study. The coefficient of the water movement was invariable in the individual case and differed among patients. We could expect the individual change of BV by using the coefficient.