Equation for Estimating Predialysis Total Body Water in Patients under Chronic Hemodialysis |Biomedgrid

Introduction: In Chile in 2018 there were 22,310 patients under chronic hemodialysis (CHD) (1,260/1,000,000 inhabitants), with an annual increase of 2,152 patients/year and a global mortality of 10.9%. First cause of death is cardiovascular (CV) disease with 32.8%. Control of total body water (TBW) helps prevent CV damage. It is necessary to know TBW to program the ultra filtration rate at the beginning of HD. Methods for estimating TBW are invasive, complex and expensive, except for multi frequency electrical Bioimpedanciometry (BCM®).However, this device has certain limitations as the 20-40 minute preparation before HD and the restriction it has in some patients. Several equations have been proposed to estimate TBW but are difficult to calculate and neither of them are local. The aim of this study was to create a total body water equation (TBWE) to estimate TBW concordant with TBW by BCM®, easy and fast to use before each CHD session.