BACKGROUND: Bioimpedance analysis (BIA) is well established to assess body composition. Agreements between single- and multi-frequency bioimpedance (SF-BIA, MF-BIS) measurements in subjects undergoing 6 or 3 times/week hemodialysis (HD) were analyzed. METHODS:Total body water (TBW) and intra- and extracellular fluid (ICF, ECF) of subjects enrolled in the Frequent Hemodialysis Network (FHN) Daily Trial (www.clinicaltrials.gov No. NCT00264758) were measured with a Hydra 4200 at baseline (BL) and at 5 months (M5). Volumes were computed using SF (at 50 kHz) and MF approaches. Agreement was assessed by means of linear regression and Bland-Altman analysis and treatment effects by t test. RESULTS:35 subjects (17 on the more frequent regimen, 26 males, 20 African-American, 48 ± 9 years, pre-HD weight 84 ± 19 kg) were studied. Assessments with SF-BIA and MF-BIS correlated significantly at BL and M5 in both arms. No proportional errors, but systematic biases over the entire range of values were found at BL and M5. Agreement did not differ between subjects randomized to either HD treatment arm at both time points. MF-BIS appears to have better precision than SF-BIA allowing the observation of a significant treatment effect by the intervention [-1.5 (95% CI -2.5 to -0.5) l] on ECF, not found for ECF SF-BIA. Precision also affected the statistical power of the SF-BIA data in the current analysis. CONCLUSION: Both methods showed agreement without significant proportional errors regardless of HD frequency and can be used for longitudinal analyses. SF-BIA has lower precision which needs thorough consideration in the design of future trials with similar outcomes.
RCT Entities:
BACKGROUND: Bioimpedance analysis (BIA) is well established to assess body composition. Agreements between single- and multi-frequency bioimpedance (SF-BIA, MF-BIS) measurements in subjects undergoing 6 or 3 times/week hemodialysis (HD) were analyzed. METHODS: Total body water (TBW) and intra- and extracellular fluid (ICF, ECF) of subjects enrolled in the Frequent Hemodialysis Network (FHN) Daily Trial (www.clinicaltrials.gov No. NCT00264758) were measured with a Hydra 4200 at baseline (BL) and at 5 months (M5). Volumes were computed using SF (at 50 kHz) and MF approaches. Agreement was assessed by means of linear regression and Bland-Altman analysis and treatment effects by t test. RESULTS: 35 subjects (17 on the more frequent regimen, 26 males, 20 African-American, 48 ± 9 years, pre-HD weight 84 ± 19 kg) were studied. Assessments with SF-BIA and MF-BIS correlated significantly at BL and M5 in both arms. No proportional errors, but systematic biases over the entire range of values were found at BL and M5. Agreement did not differ between subjects randomized to either HD treatment arm at both time points. MF-BIS appears to have better precision than SF-BIA allowing the observation of a significant treatment effect by the intervention [-1.5 (95% CI -2.5 to -0.5) l] on ECF, not found for ECF SF-BIA. Precision also affected the statistical power of the SF-BIA data in the current analysis. CONCLUSION: Both methods showed agreement without significant proportional errors regardless of HD frequency and can be used for longitudinal analyses. SF-BIA has lower precision which needs thorough consideration in the design of future trials with similar outcomes.
Authors: G M Chertow; E G Lowrie; D W Wilmore; J Gonzalez; N L Lew; J Ling; M S Leboff; M N Gottlieb; W Huang; B Zebrowski Journal: J Am Soc Nephrol Date: 1995-07 Impact factor: 10.121
Authors: ZiMian Wang; Marie-Pierre St-Onge; Beatriz Lecumberri; F Xavier Pi-Sunyer; Stanley Heshka; Jack Wang; Donald P Kotler; Dympna Gallagher; Lucian Wielopolski; Richard N Pierson; Steven B Heymsfield Journal: Am J Physiol Endocrinol Metab Date: 2003-10-07 Impact factor: 4.310
Authors: Jochen G Raimann; Christopher T Chan; John T Daugirdas; Thomas Depner; Tom Greene; George A Kaysen; Alan S Kliger; Peter Kotanko; Brett Larive; Gerald Beck; Robert McGregor Lindsay; Michael V Rocco; Glenn M Chertow; Nathan W Levin Journal: Kidney Blood Press Res Date: 2021-10-13 Impact factor: 3.096
Authors: Natália T Bellafronte; Marina R Batistuti; Nathália Z Dos Santos; Héric Holland; Elen A Romão; Paula G Chiarello Journal: J Electr Bioimpedance Date: 2018-12-31