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Related Experiment Videos

[Glomerular function and urine acidification in chronic renal diseases].

K Mizukami1

  • 1Department of Medicine, Kidney Center, Tokyo Women's Medical College, Japan.

Nihon Jinzo Gakkai Shi
|January 1, 1990
PubMed
Summary

In chronic kidney disease, urine acidifying capacity can be assessed using urine-to-blood carbon dioxide tension gradient and furosemide loading tests. These methods help evaluate distal tubular function in patients with renal dysfunction.

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Area of Science:

  • Nephrology
  • Renal Physiology
  • Acid-Base Balance

Context:

  • Chronic renal diseases, including chronic glomerulonephritis (CGN) and distal renal tubular acidosis (dRTA), often present with impaired acid-base regulation.
  • Assessing urinary acidifying capacity is crucial for managing these conditions and understanding their impact on renal function.

Purpose:

  • To evaluate urinary acidifying capacity in patients with chronic renal diseases using intravenous sodium bicarbonate and furosemide loading tests.
  • To compare acidifying capacity with glomerular filtration rate (creatinine clearance) and concentrating ability in CGN and dRTA patients.

Summary:

  • Intravenous sodium bicarbonate loading revealed increased proximal tubular bicarbonate reabsorption in CGN as creatinine clearance decreased. Urine-to-blood carbon dioxide tension gradient (U-B PCO2) in alkaline urine and lowered urine pH after furosemide loading were identified as useful indices of distal tubular acid excretion.

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  • In CGN with moderate renal dysfunction (creatinine clearance ≥ 30 ml/min), urinary acidifying capacity remained normal despite decreased urine concentrating ability, differentiating it from dRTA.

    • Impact:

    • The study highlights U-B PCO2 in alkaline urine and furosemide-induced urine pH changes as valuable indicators for assessing distal tubular acidification in renal dysfunction.
    • Findings aid in differentiating between various renal conditions and provide insights into the specific functional impairments in chronic kidney disease.