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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion01:18

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In geriatric patients, renal physiology undergoes significant changes, including diminished renal blood flow and a lower glomerular filtration rate (GFR), leading to alterations in medication clearance. Drugs such as aminoglycoside antibiotics, lithium, and digoxin, which rely on glomerular filtration for removal from the body, particularly impact pharmacokinetics. These drugs tend to have slower clearance rates in older adults, necessitating careful dosage considerations.Evaluation of renal...
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Renal function tests are crucial for assessing kidney health, monitoring disease progression, and evaluating the kidneys' efficiency in waste elimination, fluid balance, and electrolyte regulation. These tests offer critical insights into kidney function, even though routine measurements may appear normal until there is a significant decline in the glomerular filtration rate or GFR. Typically, signs of kidney impairment only become evident when the GFR falls to about 50% of its normal level.
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Physiology Lab Demonstration: Glomerular Filtration Rate in a Rat
06:58

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Published on: July 26, 2015

Renal function and functional reserve in healthy elderly individuals.

Ciro Esposito1, AnnaRita Plati, Tiziana Mazzullo

  • 1Unit of Nephrology, Dialysis and Transplantation, IRCCS Policlinico San Matteo, University of Pavia, Pavia - Italy. espositociro56@hotmail.com

Journal of Nephrology
|October 6, 2007
PubMed
Summary

Healthy aging preserves kidney function but reduces renal functional reserve (RFR) due to structural changes. Elderly kidneys show reduced responsiveness to vasodilators, indicating advanced vascular changes.

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Area of Science:

  • Nephrology
  • Gerontology
  • Physiology

Background:

  • Aging is associated with decreased renal function and increased susceptibility to kidney diseases.
  • The specific contributions of hemodynamic and structural changes to age-related renal decline are not fully understood.
  • This study investigates renal function, functional reserve, and morphology in healthy elderly individuals.

Purpose of the Study:

  • To evaluate age-related changes in renal function and renal functional reserve (RFR) in healthy individuals.
  • To assess the impact of aging on renal hemodynamics and vascular morphology.
  • To determine the responsiveness of elderly kidneys to maximal vasodilating stimuli.

Main Methods:

  • Healthy participants were categorized into young, middle-aged, and elderly groups.
  • Renal plasma flow (RPF) and glomerular filtration rate (GFR) were measured before and during maximal vasodilation induced by dopamine and amino acids.
  • Kidney biopsies were analyzed for glomerular sclerosis and afferent arteriole structure.

Main Results:

  • Elderly individuals exhibited reduced GFR and RPF, with no increase during vasodilation, unlike younger groups.
  • Nitric oxide (NO) levels increased at baseline but did not further elevate with vasodilation in the elderly.
  • Aging led to increased glomerular sclerosis and reduced afferent arteriole lumen size, while wall thickness remained unchanged.

Conclusions:

  • Renal function is maintained in healthy aging at the cost of a complete loss of RFR.
  • Reduced RFR in the elderly may compensate for increased glomerular sclerosis.
  • Advanced vascular changes, evidenced by reduced arteriolar lumen, impair kidney responsiveness to vasodilators even with high NO levels.