[Bioimpedance vector analysis as a tool for the determination and adjustment of dry weight in patients undergoing hemodialysis].
OBJECTIVE
Overhydration in hemodialysis patients is associated with cardiovascular mortality. Adequate removal of liquids and achievement of dry weight is one of the main goals of therapy. So far there are no clinical or laboratory parameters that are reliable, simple and affordable for its determination. The bioelectrical impedance vector analysis (BIVE) is a tool that allows identifying and monitoring hydration status, so the aim of this study was to use BIVE to adjust the intensity of ultrafiltration and achieve dry weight in hemodialysis patients.


METHODS
We studied 26 patients on hemodialysis, which were performed monthly measurements of bioelectrical impedance for four months. Corresponding vectors were plotted to know in an individual way the state of hydration, according to which the dry weight was adjusted when necessary.


RESULTS
Dry weight adjustment was performed in 13 patients, 7 of which required increase and 6 decrease of dry weight. The displacement of vectors on the ellipses corresponded to the type of intervention made. Dry weight was reached in 84.6% of patients at the end of the study with a significant decrease in mean arterial blood pressure and an increase in phase angle in the group of decrease of dry weight.


CONCLUSIONS
Bioelectrical impedance vector analysis is an useful tool for adjusting the dry weight in patients undergoing hemodialysis.
Departamento de Nefrología. Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán. Distrito Federal, México.. xime1879@hotmail.com.
Ximena
X
Atilano-Carsi
Servicio de Nefrología. Hospital Universitario La Paz. IdiPAZ. IRSIN. REDinREN. Madrid, España.. xime1879@hotmail.com.
José Luis
JL
Miguel
Servicio de Nefrología. Hospital Universitario La Paz. IdiPAZ. IRSIN. REDinREN. Madrid, España.. xime1879@hotmail.com.
Jorge
J
Martínez Ara
Servicio de Nefrología. Hospital Universitario La Paz. IdiPAZ. IRSIN. REDinREN. Madrid, España.. xime1879@hotmail.com.
Rafael
R
Sánchez Villanueva
Servicio de Nefrología. Hospital Universitario La Paz. IdiPAZ. IRSIN. REDinREN. Madrid, España.. xime1879@hotmail.com.
Elena
E
González García
Servicio de Nefrología. Hospital Universitario La Paz. IdiPAZ. IRSIN. REDinREN. Madrid, España.. xime1879@hotmail.com.
Rafael
R
Selgas Gutiérrez
D000368:Aged; D001823:Body Composition; D001835:Body Weight; D003627:Data Interpretation, Statistical; D017097:Electric Impedance; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D006435:Renal Dialysis / Q000379:methods*