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Racial differences in potassium disposal.

Annie Suh1, Ernest DeJesus, Karol Rosner

  • 1Department of Medicine, Division of Nephrology/Hypertension and Endocrinology, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611-3008, USA.

Kidney International
|August 26, 2004
PubMed
Summary

African Americans exhibit reduced potassium (K+) disposal compared to Caucasian Americans. This difference persists even with controlled diets, suggesting underlying physiological variations in electrolyte handling.

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Area of Science:

  • Nephrology
  • Physiology
  • Human Health

Background:

  • African Americans show lower potassium (K+) levels than Caucasian Americans on various diets.
  • This study investigates racial differences in potassium handling.

Purpose of the Study:

  • To determine if race affects extrarenal potassium disposal.
  • To compare the body's response to an intravenous potassium load between African Americans and Caucasian Americans.

Main Methods:

  • 12 African American and 12 Caucasian American subjects received intravenous potassium chloride (KCl) infusions.
  • Serum K+, glucose, insulin, renin, and aldosterone were measured.
  • Urinary K+ and Na+ were also monitored during the study.

Main Results:

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  • African Americans showed a greater rise in serum K+ after KCl infusion compared to Caucasians.
  • This difference in K+ disposal was observed even after 10 days of controlled electrolyte intake.
  • African Americans had lower baseline aldosterone and higher insulin levels post-infusion.

Conclusions:

  • Potassium (K+) disposal is impaired in African Americans compared to Caucasian Americans.
  • This may be linked to reduced Na+,K+-ATPase activity in African Americans.