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Adaptive hyperfiltration in the aging kidney after contralateral nephrectomy.

Anjali Bhatt Saxena1, Bryan D Myers, Geraldine Derby

  • 1Stanford University Medical Center, Division of Nephrology, 750 Welch Rd., Suite 200, Palo Alto, CA 94304-1590, USA.

American Journal of Physiology. Renal Physiology
|March 10, 2006
PubMed
Summary
This summary is machine-generated.

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Adaptive hyperfiltration, the kidney's compensatory response after nephrectomy, is similar in aging and youthful individuals. However, aging subjects exhibit greater arterial hypertension, potentially increasing risks for kidney damage.

Area of Science:

  • Nephrology
  • Physiology
  • Gerontology

Background:

  • Individuals undergoing nephrectomy exhibit adaptive hyperfiltration in the remaining kidney.
  • Aging may influence the compensatory mechanisms of renal adaptation post-nephrectomy.

Purpose of the Study:

  • To compare the magnitude of adaptive hyperfiltration in aging versus youthful individuals after contralateral nephrectomy.
  • To investigate the physiological factors contributing to hyperfiltration in uninephric subjects across different age groups.

Main Methods:

  • Compared glomerular filtration rate (GFR), renal plasma flow, plasma oncotic pressure, and mean arterial pressure in uninephric (one kidney) versus binephric (two kidneys) subjects.
  • Utilized mathematical modeling to determine the contribution of ultrafiltration coefficient (K(f)) and transcapillary hydraulic pressure gradient (DeltaP) to hyperfiltration.

Related Experiment Videos

Main Results:

  • Both youthful and aging uninephric subjects demonstrated increased GFR, renal plasma flow, plasma oncotic pressure, and mean arterial pressure compared to binephric controls.
  • Hyperfiltration in youthful subjects could be explained by a 110% increase in K(f) or a 7 mmHg increase in DeltaP.
  • In aging subjects, hyperfiltration was associated with a 61% increase in K(f) or a 5 mmHg increase in DeltaP, with greater adaptive arterial hypertension observed.

Conclusions:

  • The magnitude of adaptive hyperfiltration is comparable between aging and youthful uninephric individuals, though absolute GFR is lower in aging subjects.
  • Both K(f) and DeltaP play roles in hyperfiltration, with a potentially disproportionate contribution of glomerular hypertension (DeltaP) in aging individuals.
  • Increased glomerular hypertension in aging uninephric subjects may accelerate age-related kidney damage and lead to renal insufficiency, warranting caution with older living kidney donors.