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Related Concept Videos

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

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion

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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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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism

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Geriatric patients show significant variation in how their bodies process medications, which can change how effective and safe treatments are. The liver is the primary organ where drug metabolism occurs, involving two main types of chemical reactions: phase I and II. Phase I metabolism is driven by the cytochrome P450 enzyme system, which includes key types such as CYP3A, CYP2D6, and CYP2C9. Research indicates that while aging doesn't notably alter the levels or activity of these enzymes, it...
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Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

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Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

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Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are...
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Longitudinal Research02:20

Longitudinal Research

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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration

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Glomerular filtration rate (GFR) can be estimated from serum creatinine using the modification of diet in renal disease (MDRD) formula or the chronic kidney disease–epidemiology collaboration (CKD–EPI) equation. Both methods are widely used in clinical practice to assess kidney function and guide treatment decisions.The MDRD equation does not require weight or height measurements and is normalized to the body surface area of 1.73 m², considered the average adult surface area.
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Related Experiment Video

Updated: Apr 5, 2026

A Mouse Model to Evaluate the Long-Term Structural and Functional Outcomes after the Reversal of Prolonged Unilateral Ureteric Obstruction
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A Mouse Model to Evaluate the Long-Term Structural and Functional Outcomes after the Reversal of Prolonged Unilateral Ureteric Obstruction

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Kidney function changes with aging in adults: comparison between cross-sectional and longitudinal data analyses in

Sang M Chung1, David J Lee1, Austin Hand2

  • 1Office of Clinical Pharmacology (OCP), Office of Translational Sciences, Center for Drug Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, USA.

Biopharmaceutics & Drug Disposition
|August 25, 2015
PubMed
Summary

Renal function decline rates in adults differ based on statistical analysis methods. Longitudinal analysis, considering repeated measurements, reveals slower decline compared to cross-sectional analysis, offering more reliable individual estimates.

Keywords:
cross-sectional analysislongitudinal analysisrenal function decline rates

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Assessment of Vascular Function in Patients With Chronic Kidney Disease
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Quantitative Real-Time Polymerase Chain Reaction Evaluation of MicroRNA Expression in Kidney and Serum of Mice with Age-Dependent Renal Impairment
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Assessment of Vascular Function in Patients With Chronic Kidney Disease
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Area of Science:

  • Gerontology
  • Nephrology
  • Biostatistics

Background:

  • Age-related decline in renal function is a significant health concern.
  • Accurate estimation of renal function decline rates is crucial for clinical decision-making.

Purpose of the Study:

  • To compare renal function decline rates estimated by cross-sectional (CS) and longitudinal (LT) statistical analyses.
  • To determine the impact of statistical methodology on the perceived rate of age-related renal function decline in adults.

Main Methods:

  • Utilized a dataset of 16,628 creatinine clearance records from 3,946 adult subjects (aged 30-92).
  • Employed simple linear regression for CS analysis and random coefficient models for LT analysis.
  • LT analysis incorporated multiple observations per subject over an average of 793 days.

Main Results:

  • CS analysis estimated an annual renal function decline rate of 1.33 ml/min/year.
  • LT analysis, accounting for individual repeated measurements, estimated a slower decline rate of 0.95 ml/min/year.
  • The study confirmed significant differences in estimated decline rates based on the statistical approach.

Conclusions:

  • Renal function decline rate estimations are highly dependent on the statistical analysis employed.
  • Longitudinal analysis provides more reliable individual and population estimates of age-related renal function decline.
  • Caution is advised when interpreting renal function decline data; longitudinal models are recommended for personalized assessments, such as medication dose adjustments.