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Bioelectrical impedance measurement: errors and artifacts.

B R Di Iorio1, V Terracciano, V Bellizzi

  • 1Dialysis & Nephrology Unit, Lentini Hospital, I-85045 Lauria (PZ), Italy.

Journal of Renal Nutrition : the Official Journal of the Council on Renal Nutrition of the National Kidney Foundation
|October 21, 1999
PubMed
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Bioelectrical impedance analysis (BIA) can estimate body water but is inaccurate in dialysis patients. Conditions like fever, cramps, lymphoedema, or medical devices significantly alter BIA measurements, affecting body composition predictions.

Area of Science:

  • Biomedical Engineering
  • Clinical Physiology
  • Medical Diagnostics

Background:

  • Bioelectrical impedance analysis (BIA) is a noninvasive method for estimating body water.
  • Total body impedance is primarily determined by limb measurements, with the trunk contributing minimally.
  • BIA's utility in clinical monitoring of body water abnormalities is recognized.

Purpose of the Study:

  • To assess prediction errors in body composition using BIA in dialysis patients.
  • To investigate the impact of specific clinical conditions on BIA measurements.
  • To evaluate BIA accuracy with measurements on the nondominant arm and in the presence of various medical interventions.

Main Methods:

  • Studied 20 healthy subjects and various groups of uremic patients (dialysis, fever, cramps, lymphoedema, vascular access).

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  • Collected BIA data from different patient cohorts under varying physiological and clinical conditions.
  • Compared BIA-derived total body water (TBW) values across different measurement scenarios.

    • Main Results:

    • BIA measurements showed variations based on posture (1.1%–1.6%), fever (6%), cramps (-0.73%), and lymphoedema (25%).
    • Presence of arteriovenous fistula, central venous catheter, or vascular graft resulted in significant TBW prediction errors (-24% to +4%).
    • These findings indicate substantial deviations from expected BIA values in specific patient populations.

    Conclusions:

    • Whole-body BIA measurements can yield significant errors in body composition prediction for dialysis patients.
    • Clinical conditions such as fever, cramps, lymphoedema, and the presence of vascular access devices compromise BIA accuracy.
    • Caution is advised when interpreting BIA results in patients with these complicating factors.