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Related Experiment Videos

Oxygen consumption during maintenance hemodialysis.

A Blumberg, G Keller

    Nephron
    |January 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Hemodialysis did not impair oxygen delivery in patients undergoing treatment. Despite increased blood pH and hemoglobin affinity, oxygen consumption remained stable, indicating effective oxygen transport during dialysis.

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    Area of Science:

    • Nephrology
    • Physiology
    • Biochemistry

    Background:

    • Hemodialysis can alter blood pH, potentially affecting hemoglobin's oxygen affinity.
    • Previous assumptions suggested hemodialysis might impair oxygen delivery due to these changes.

    Purpose of the Study:

    • To investigate the influence of hemodialysis on oxygen consumption and delivery.
    • To assess changes in hemoglobin oxygen affinity and related physiological parameters during dialysis.

    Main Methods:

    • Measured 2,3-diphosphoglycerate (2,3-DPG), P50, blood gases, and cardiac index in 15 patients on maintenance dialysis.
    • Analyzed arterial and central venous blood samples before and after hemodialysis.
    • Calculated oxygen consumption and corrected for changes in cardiac index and hemoconcentration.

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    Main Results:

    • In vivo P50 significantly decreased during dialysis due to increased pH (Bohr effect), indicating higher oxygen-hemoglobin affinity.
    • Arterial PO2 decreased post-dialysis, but oxygen saturations remained unchanged.
    • Cardiac index increased, and oxygen consumption rose significantly (p < 0.05), explained by increased cardiac output and hemoconcentration.

    Conclusions:

    • Hemodialysis-induced rise in pH and subsequent increase in oxygen-hemoglobin affinity did not impair oxygen delivery in patients on maintenance dialysis.
    • Oxygen consumption increased post-dialysis, driven by increased cardiac index and hemoconcentration, not by impaired oxygen delivery.
    • Findings challenge previous assumptions regarding the impact of hemodialysis on oxygen transport efficiency.