P1127BIOELECTRIC IMPEDANCE IN ESTIMATION OF DRY WEIGHT IN CHRONIC DIALYSIS PATIENTS

Abstract Background and Aims Fluid status evaluation is essential to adjust the dry weight(DW) in chronic hemodialysis (HD) patients. Bioelectric impedance is a non invasive technique. Its contribution in HD population is well demonatrated. The aim of this study is to compare evaluation of fluid status clinically and by bioimpedance analysis. Method It’s a transversal study conducted in December 2018.We included chronic dialysis patients( for more 3 months) having 3 dialysis sessions(DS) a week. Bioimpedance analysis (BIA) was performed before and after DS. Results There were 26 patients with an average age of 51,4 years. Sex ratio was 3,33 . Average period spent in HD was 73,7 months. Vascular access was a native arteriovenous fistula in 24 patients, and a catheter in 2 patients. Seven patients had residual diuresis. Average ultrafiltration rate was 2,82 L (10 mL/Kg/h). Before DS, 20 patients had no clinical signs of fluid overload. Unconformity with BIA was noted in 12 patients, with a subclinical overload in all cases. Six patients had clinical signs of fluid overload (including hypertension (HT) in 5 cases), which was concordant with BIA. After DS, 22 patients reached their DW with a correct hydration status, 2 patients still had clinical signs of fluid overload, and 2 had isolated HTA. BIA revealed the persistence of fluid overload in 10 patients contrasting with the absence of clinical signs of hypervolemia in 8 patients. Patients who kept only HT had a normal hydration status. Conclusion Fluid status is an important adequacy issue in the treatment of renal failure. It’s a modifiable risk factor associated to mortality. Bioimpedance analysis is a great help to precise dry weight that must be integrated into our daily practice.