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2002•Acta NephrologicaRequires access

Evaluation of Ideal Body Weight in Dialysis Patients through Bioelectrical Impedance Analysis

Weng-Sheng Tsai, Chia‐Chao Wu, Shih‐Hua Lin, Pauling Chu, San‐Chiang Wu, Yu‐Juei Hsu, Yuh‐Feng Lin

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Abstract

Background: It is essential to define dry weight (DW) for each patient in clinical dialysis, but many patient remain with fluid overload even in clinical DW. Currently, bioelectrical impedance analysis (BIA) can accurately measure the compostition of different body fluid compartments. The present study was conducted to investigate the body fluid compartment by BIA in dialysis patients. Materials and Methods: Ninety three dialysis patients including 56 hemodialysis (HD) patients and 37 continuous ambulatory peritoneal dialysis (CAPD) patients and thirty six sex and age matched controls have underwent BIA measurement. The dry weight of dialysis patients was adjusted DW by nephrologists weekly. BIA was performed with a multifrequency bioimpedance analyzer (InBody 3.0(subscript TM), Biospace Co. Ltd. U.S.A). Both pre- and post-hemodialysis measurement were performed in hemodialysis patients. Body weight (BW), total body water (TBW), extracellular fluid (ECF) and intracellular fluid (ICF) were measured. For furthere evaluation, the dialysis patients were divided into edematous and nonedemaous group based on ECF/TBW ratio greater or less than 0.35. Results: There was no significant difference of TBW/BW ratio between dialysis groups or between dialysis groups and control group. Eventhough there was no difference of ECF/TBW between HD group and CAPD group, there was significant difference between HD groups and control group (HD 0.342±0.004 vs control 0.328±0.002, p＜0.05). There were significant difference of ECF/TBW and ICF/ECF ratio either between edematous group and nonedematous group (p＜0.05) or between edematous group and normal controls (p＜0.05), but no difference between non-edematous group and normal control or between edematous group and normal controls (p＜0.05). Interestingly, there were no significant relationships between TBW/BW and ECF/TBW. Conclusions: BIA is an appropriate noninvasive method for DW determination and the ECF/TBW and ICF/ECF ratio was more accurate than TBW/BW ratio to evaluate the optimal DW in dialysis patient.

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Background: It is essential to define dry weight (DW) for each patient in clinical dialysis, but many patient remain with fluid overload even in clinical DW. Currently, bioelectrical impedance analysis (BIA) can accurately measure the compostition of different body fluid compartments. The present study was conducted to investigate the body fluid compartment by BIA in dialysis patients. Materials and Methods: Ninety three dialysis patients including 56 hemodialysis (HD) patients and 37 continuous ambulatory peritoneal dialysis (CAPD) patients and thirty six sex and age matched controls have underwent BIA measurement. The dry weight of dialysis patients was adjusted DW by nephrologists weekly. BIA was performed with a multifrequency bioimpedance analyzer (InBody 3.0(subscript TM), Biospace Co. Ltd. U.S.A). Both pre- and post-hemodialysis measurement were performed in hemodialysis patients. Body weight (BW), total body water (TBW), extracellular fluid (ECF) and intracellular fluid (ICF) were measured. For furthere evaluation, the dialysis patients were divided into edematous and nonedemaous group based on ECF/TBW ratio greater or less than 0.35. Results: There was no significant difference of TBW/BW ratio between dialysis groups or between dialysis groups and control group. Eventhough there was no difference of ECF/TBW between HD group and CAPD group, there was significant difference between HD groups and control group (HD 0.342±0.004 vs control 0.328±0.002, p＜0.05). There were significant difference of ECF/TBW and ICF/ECF ratio either between edematous group and nonedematous group (p＜0.05) or between edematous group and normal controls (p＜0.05), but no difference between non-edematous group and normal control or between edematous group and normal controls (p＜0.05). Interestingly, there were no significant relationships between TBW/BW and ECF/TBW. Conclusions: BIA is an appropriate noninvasive method for DW determination and the ECF/TBW and ICF/ECF ratio was more accurate than TBW/BW ratio to evaluate the optimal DW in dialysis patient.

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Available abstract

Background: It is essential to define dry weight (DW) for each patient in clinical dialysis, but many patient remain with fluid overload even in clinical DW. Currently, bioelectrical impedance analysis (BIA) can accurately measure the compostition of different body fluid compartments. The present study was conducted to investigate the body fluid compartment by BIA in dialysis patients. Materials and Methods: Ninety three dialysis patients including 56 hemodialysis (HD) patients and 37 continuous ambulatory peritoneal dialysis (CAPD) patients and thirty six sex and age matched controls have underwent BIA measurement. The dry weight of dialysis patients was adjusted DW by nephrologists weekly. BIA was performed with a multifrequency bioimpedance analyzer (InBody 3.0(subscript TM), Biospace Co. Ltd. U.S.A). Both pre- and post-hemodialysis measurement were performed in hemodialysis patients. Body weight (BW), total body water (TBW), extracellular fluid (ECF) and intracellular fluid (ICF) were measured. For furthere evaluation, the dialysis patients were divided into edematous and nonedemaous group based on ECF/TBW ratio greater or less than 0.35. Results: There was no significant difference of TBW/BW ratio between dialysis groups or between dialysis groups and control group. Eventhough there was no difference of ECF/TBW between HD group and CAPD group, there was significant difference between HD groups and control group (HD 0.342±0.004 vs control 0.328±0.002, p＜0.05). There were significant difference of ECF/TBW and ICF/ECF ratio either between edematous group and nonedematous group (p＜0.05) or between edematous group and normal controls (p＜0.05), but no difference between non-edematous group and normal control or between edematous group and normal controls (p＜0.05). Interestingly, there were no significant relationships between TBW/BW and ECF/TBW. Conclusions: BIA is an appropriate noninvasive method for DW determination and the ECF/TBW and ICF/ECF ratio was more accurate than TBW/BW ratio to evaluate the optimal DW in dialysis patient.

Key concepts: Bioelectrical impedance analysis, Body water, Medicine, Hemodialysis, Dialysis, Body fluid, Extracellular fluid, Peritoneal dialysis

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