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Bioelectrical impedance and hemodialysis

S Mandolfo1, M Farina, E Imbasciati

  • 1Renal Unit, Ospedale Maggiore, Lodi, Italy.

The International Journal of Artificial Organs
|November 1, 1995
PubMed
Summary

Bioelectrical impedance analysis (BIA) reliably measures total body water (TBW) for urea distribution in hemodialysis patients. However, BIA is not accurate for tracking acute fluid changes or predicting hypotension during dialysis.

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Area of Science:

  • Nephrology
  • Physiology
  • Medical Technology

Background:

  • Bioimpedance is a non-invasive technique for assessing body fluid composition.
  • Accurate body fluid assessment is crucial in hemodialysis patients.

Purpose of the Study:

  • Evaluate the reliability of bioelectrical impedance analysis (BIA) for measuring urea distribution volume, a proxy for total body water (TBW).
  • Assess BIA's ability to track body fluid changes before and after dialysis.
  • Determine BIA's efficacy in predicting hypotensive episodes during hemodialysis.

Main Methods:

  • Bioelectrical impedance analysis (BIA) was performed on twelve hemodialysis patients.
  • Measurements were taken before, during, and after dialysis sessions.
  • Results were compared with urea distribution volume, Watson equation, and anthropometric values.

Main Results:

  • BIA-measured TBW correlated significantly with urea distribution volume (r=0.64) and Watson equation (r=0.65).
  • BIA overestimated fluid losses post-dialysis (14-70%), but reflected weight loss 6 hours after treatment.
  • On-line BIA showed low predictive value (41.6%) and sensitivity (66%) for hypotension.

Conclusions:

  • BIA is a useful tool for assessing urea distribution volume in hemodialysis patients.
  • BIA is not reliable for monitoring acute fluid shifts or predicting dialysis-induced hypotension.

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