Method and a device for determining the dry weight of a patient with kidney failure
First Claim
1. A method for determining the dry weight Wgtdry(t) of a patient at a time t comprising the steps of:
- determining the extracellular water volume ECV(t) of the patient at the time t, determining the weight Wgt(t) of the patient at the time t, deriving the dry weight Wgtdry(t) of the patient from an intersection of a function derived from the determined ECV(t) and Wgt(t) values with a previously established extracellular water volume (ECV) against dry weight (Wgtdry) reference relation representing healthy subjects.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to a method and a device for monitoring the fluid status of a patient with kidney failure. In case of renal failure all forms of ingested fluid accumulate in body tissues causing increased stress on the circulatory system. This surplus fluid has to be removed during a dialysis treatment by ultrafiltration of the blood. The amount of this surplus fluid or the weight corrected for this surplus fluid, i.e. the dry weight, is an important parameter for managing the fluid status of a dialysis patient. According to the invention the dry weight Wgtdry(t) of a patient at a time t is determined by determining the extracellular water volume ECV(t) of the patient at the time t, by determining the weight Wgt(t) of the patient at the time t and by deriving the dry weight Wgtdry(t) of the patient from an intersection of a function derived from the determined ECV(t) and Wgt(t) values with a previously established extracellular water volume (ECV) against dry weight (Wgtdry) reference relation representing healthy subjects. To obtain more accurate results it is also proposed to take into account a compartimental mass correction Δm(t). The invention also relates to a device for deriving the dry weight Wgtdry(t).
-
Citations
25 Claims
-
1. A method for determining the dry weight Wgtdry(t) of a patient at a time t comprising the steps of:
-
determining the extracellular water volume ECV(t) of the patient at the time t, determining the weight Wgt(t) of the patient at the time t, deriving the dry weight Wgtdry(t) of the patient from an intersection of a function derived from the determined ECV(t) and Wgt(t) values with a previously established extracellular water volume (ECV) against dry weight (Wgtdry) reference relation representing healthy subjects. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
Specification