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[Trans-membrane cationic flow and hemodialysis].

L A Sechi1, C Orecchioni, A Melis

  • 1Istituto di Clinica Medica Generale, Universitá di Sassari.

Bollettino Della Societa Italiana Di Biologia Sperimentale
|October 1, 1990
PubMed
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Uremic patients exhibit altered red blood cell ion concentrations, specifically increased intracellular potassium and reduced sodium-potassium pump activity. Hemodialysis did not acutely reverse these ion transport abnormalities in chronic kidney disease patients.

Area of Science:

  • Nephrology
  • Physiology
  • Red Blood Cell Biology

Background:

  • Uremia is associated with disruptions in intracellular ion balance and transmembrane transport.
  • Red blood cell (RBC) ion transport abnormalities are implicated in uremic pathophysiology.

Purpose of the Study:

  • To investigate the acute effects of hemodialysis on RBC ion concentrations and transport systems in chronically hemodialyzed patients.
  • To compare ion transport parameters between uremic patients and a healthy reference group.

Main Methods:

  • Evaluated intracellular Na and K concentrations, Na/K pump activity, Na/K cotransport, Na/Li countertransport, and passive Na permeability in RBCs.
  • Compared 12 hemodialyzed patients to a normal reference group, assessing changes before and after dialysis.
  • Analyzed differences between normotensive and hypertensive uremic patients.

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Main Results:

  • Uremic patients showed significantly higher intracellular K+ and lower ouabain-sensitive Na+/K+ pump activity compared to controls.
  • Intracellular Na+ levels were not elevated, and other transport systems were comparable to normal.
  • No significant changes in ion transport were observed immediately before and after hemodialysis.
  • A trend suggested lower Na+/K+ pump activity in hypertensive uremic patients, though not statistically significant.

Conclusions:

  • Ion transport derangements are present in uremia.
  • Hemodialysis does not acutely correct these RBC ion transport abnormalities.
  • Further research is needed to understand the long-term implications and potential interventions for uremic ion transport defects.