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Related Experiment Videos

Ionometry versus flame photometry in dialysis therapy.

S Stiller1, H Mann

  • 1Dept. Internal Medicine III, Technical University of Aachen, GFR.

Life Support Systems : the Journal of the European Society for Artificial Organs
|January 1, 1985
PubMed
Summary

Ionometry is a viable alternative to flame photometry for measuring potassium and sodium during dialysis. While excellent for potassium, sodium measurements showed lower correlation, attributed to flame photometry errors.

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Area of Science:

  • Clinical Chemistry
  • Biomedical Engineering
  • Medical Diagnostics

Background:

  • Flame photometry is a standard method for measuring electrolytes like sodium and potassium.
  • Ion-selective electrodes (ionometry) offer a potential alternative for electrolyte measurement.
  • Dialysis therapy requires accurate monitoring of electrolytes in serum and dialysis fluid.

Purpose of the Study:

  • To evaluate ionometry as an alternative to flame photometry for sodium and potassium measurement.
  • To compare the accuracy and reliability of both methods in serum and dialysis fluid.
  • To investigate the influence of various parameters on measurement accuracy.

Main Methods:

  • Parallel measurements of sodium and potassium using ionometry and flame photometry.
  • Analysis of samples from patients undergoing dialysis (serum and dialysis fluid).
  • Investigation of factors including protein concentration, pH, acetate, and bicarbonate.

Main Results:

  • Excellent correlation (r > 0.95) for potassium measurements between ionometry and flame photometry.
  • Unsatisfactory correlation for sodium measurements (serum r = 0.77, dialysis fluid r < 0.85).
  • Attributed lower sodium correlation to random errors in flame photometry rather than ionometry.

Conclusions:

  • Ionometry can be accepted as a reliable alternative to flame photometry for potassium measurement in dialysis.
  • Further investigation is needed for sodium measurement, but ionometry shows promise.
  • Ionometry is suitable for routine electrolyte monitoring during dialysis therapy.

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