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Related Experiment Videos

Renal functional reserve in elderly patients

J Böhler1, D Glöer, P Reetze-Bonorden

  • 1Department of Nephrology, University of Freiburg, Germany.

Clinical Nephrology
|March 1, 1993
PubMed
Summary

Elderly individuals maintain good renal functional reserve (RFR) despite age-related decreases in glomerular filtration rate (GFR). This suggests factors beyond glomerulosclerosis contribute to lower baseline GFR in older adults.

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Area of Science:

  • Nephrology
  • Geriatric Medicine
  • Physiology

Background:

  • Renal functional reserve (RFR) assesses kidney function, defined as the difference between resting and maximal glomerular filtration rate (GFR).
  • GFR naturally declines with age, approximately 1 ml/min per year.
  • Understanding how age-related GFR decline impacts RFR is crucial for evaluating kidney health in the elderly.

Purpose of the Study:

  • To determine the effect of age-related GFR decline on absolute and relative RFR values.
  • To investigate RFR in hospitalized elderly patients recovering from non-renal conditions.

Main Methods:

  • Studied 12 hospitalized patients aged 60-85 years.
  • Measured inulin and para-aminohippuric acid (PAH) clearance over 4 hours on two consecutive days.

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  • Administered intravenous glucose solution on day A and amino acid solution on day B.

    • Main Results:

    • Baseline GFR in elderly patients was 73.2 ml/min per 1.73 m2, increasing to 99.1 ml/min per 1.73 m2 (35.3% increase) after amino acid stimulation (p < 0.025).
    • Renal functional reserve (RFR) was measured at 25.9 ml/min per 1.73 m2.
    • PAH clearance showed a significant increase from 329.0 to 438.8 ml/min per 1.73 m2 (p < 0.025).

    Conclusions:

    • Elderly individuals exhibit a lower baseline GFR compared to younger adults.
    • Despite lower baseline GFR, renal functional reserve (RFR) is well-maintained in elderly subjects.
    • Age-related glomerulosclerosis may not solely explain the reduced baseline GFR observed in the elderly.