Estimacion del agua corporal total y del peso seco usando impedancia bioelectrica tetrapolar de multifrecuencia en pacientes en hemodialisis. Universidad Nacional de Colombia, Unidad Renal Fundacion Hospital San Carlos, Cruz Roja y Centro de Investigacion

Dry weight assessment in renal patients has got difcult because of many variables which are taken into account to do it. Because it is used to determine the dialytic, pharmacological and nutritional treatment in such patients, it has worked on different equations and methods in order to obtain it. 20 Agua corporal y hemodilisis: 19-31 Objetive. To describe body composition, total body water and dry weight of patiens who suffer from renal disease and are under hemodialysis. Materials and methods. A transversal descriptive study was carried out by six phases from the year 2001 to 2010. It was used the Unifrequency Tetrapolar Bioimpedance (BIA-1), the Multifrequency Tetrapolar Bioimpedance (BIA-4) and the Ramrez-Almanza equation. Normovolemia and hipervolemia values were used to establish dry weight and a new instrument was used in nutritional diagnosis to global subjective valuation in renal patient under hemodialysis, the Malnutrition Inammation Score (MIS). Results. 50% of the studied patients had a diabetes and hipertension diagnosis, 87% were in a low risk of desnutrition, just 3% without any risk of desnutrition. The Resistance cohort point given by the bioimpedance of 550 allows to determine who patients with values under of this are somatics with 73% a hight sensibility and a 50% specicity. To total water weight it is possible to use the Ramirez-Almanza equation due to it has a good mediana correlation (0.76) with the Kushner Impedance Index. VGS-MIS is the best assessment method used until know on renal patient because it involves different physic, nutritional, clinic and biochemic parameters. Conclusion. Bioimpedance use on patient under hemodialysis has led a higher precision in the total body water, dry weight and nutritional state in such patients.