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Related Experiment Videos

An equation for calculating postdialysis plasma sodium.

F Lopot1, J Bláha, A Válek

  • 1University Hospital 2, Department of Internal Medicine, Strahov, Czechoslovakia.

The International Journal of Artificial Organs
|June 1, 1992
PubMed
Summary

Excessive thirst and weight gain during hemodialysis (HD) can be managed by optimizing post-dialysis plasma sodium. The ideal post-dialysis sodium level should be slightly higher than the pre-dialysis level to maintain osmotic balance.

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Area of Science:

  • Nephrology
  • Physiology

Background:

  • Adequate ultrafiltration (UF) control in hemodialysis (HD) requires a precise dry weight.
  • Excessive interdialytic weight gain (delta BW) is linked to interdialytic thirst, influenced by post-dialysis plasma sodium (CPNa post).

Purpose of the Study:

  • To establish the desired post-dialysis plasma sodium level (CPNa post) to manage interdialytic thirst and weight gain.
  • To understand the relationship between plasma sodium, electrolytes, and fluid intake between dialysis sessions.

Main Methods:

  • Analysis of the correlation between delta BW and intradialytic plasma sodium changes.
  • Consideration of thirst mediation by osmoreceptors.
  • Evaluation of pre-dialysis plasma sodium stability as a patient's osmotic set value.
  • Calculation based on potassium removal from intra- and extracellular spaces during HD.

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Main Results:

  • Fluid intake between dialyses is primarily driven by electrolytes, not urea.
  • Pre-dialysis plasma sodium is a stable indicator of a patient's osmotic equilibrium.
  • A recommended CPNa post is approximately 1-2 mmol/l higher than the pre-dialysis plasma sodium (CPNa pre).

Conclusions:

  • Optimizing CPNa post is crucial for controlling interdialytic thirst and weight gain in HD patients.
  • Maintaining osmotic steady state by adjusting CPNa post can improve HD outcomes.
  • The findings provide a basis for setting target CPNa post values in clinical practice.