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Renal response to potassium loading in sickle cell trait

J R Oster, D C Lanier, C A Vaamonde

    Archives of Internal Medicine
    |April 1, 1980
    PubMed
    Summary

    Sickle cell trait (HbAS) patients show normal kidney function for excreting potassium. This study found no increased risk of hyperkalemia in HbAS individuals during high potassium intake.

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    Area of Science:

    • Nephrology
    • Hematology
    • Genetics

    Background:

    • Renal medullary abnormalities are frequent in sickle cell disease (HbSS) and sickle cell trait (HbAS).
    • Sickle cell disease (HbSS) is linked to reduced urinary potassium excretion.
    • Renal potassium handling in sickle cell trait (HbAS) remains uninvestigated.

    Purpose of the Study:

    • To investigate renal potassium handling in individuals with sickle cell trait (HbAS).
    • To determine if HbAS is associated with impaired potassium excretion or hyperkalemia risk.

    Main Methods:

    • Nine HbAS and eight black control (HbAA) volunteers received an oral potassium chloride load.
    • Urine was collected for five hours post-load.
    • Serum and urinary potassium levels were measured before and after loading.

    Main Results:

    • No significant differences were observed between HbAS and HbAA groups in serum or urinary potassium levels.
    • The percentage of administered potassium excreted was similar between groups.
    • HbAS individuals exhibited no impairment in renal potassium excretion response.

    Conclusions:

    • Individuals with sickle cell trait (HbAS) demonstrate normal renal response to oral potassium loading.
    • Despite decreased concentrating ability, HbAS does not appear to increase hyperkalemia risk during high potassium intake.

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