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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 Distribution01:00

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

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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

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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 Absorption01:22

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As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
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Drug Dosing: Geriatric Patients01:15

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Elderly individuals encompass a diverse population with varying degrees of age-related physiological changes. Defining the elderly presents challenges, as the geriatric population is often arbitrarily categorized as individuals older than 65. However, many individuals in this group lead active and healthy lives, with an increasing number surpassing 85 years and falling into the older elderly category. Physiological changes associated with aging impact performance capacity and homeostatic...
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Copeptin kinetics in healthy aging.

Sven Lustenberger1,2, Friederike Riehle1,2, Leyla Blattmann1,2

  • 1Department of Endocrinology, Diabetology and Metabolism, University Hospital Basel, 4031 Basel, Switzerland.

The Journal of Clinical Endocrinology and Metabolism
|April 11, 2026
PubMed
Summary
This summary is machine-generated.

Older adults maintain arginine vasopressin (AVP) kinetics but show reduced copeptin suppression after hydration. This diminished response may increase hyponatremia risk in the elderly.

Keywords:
AVPRCTcopeptinhealthy agingvasopressin

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Area of Science:

  • Endocrinology
  • Gerontology
  • Physiology

Background:

  • Disturbances in water homeostasis, leading to hypo- or hypernatremia, are more common in older adults.
  • Age-related changes in arginine vasopressin (AVP) kinetics are suspected but difficult to confirm due to AVP measurement challenges.
  • Copeptin, a stable marker for AVP secretion, has not been studied regarding age-related kinetic changes.

Purpose of the Study:

  • To investigate copeptin kinetics in healthy aging individuals.
  • To test the hypothesis that older adults have a reduced within-subject range of copeptin compared to younger adults.

Main Methods:

  • A randomized controlled cross-over trial involving 16 healthy older adults (≥60 years) and 16 younger adults (18-30 years).
  • Participants underwent standardized copeptin stimulation (3% saline infusion) and suppression (tap water ingestion) tests.
  • Copeptin levels were measured at baseline and various time points up to 120 minutes post-intervention.

Main Results:

  • The within-subject copeptin range was comparable between older adults (12.6 pmol/L) and younger controls (14.2 pmol/L).
  • Copeptin response to stimulation was similar between the age groups.
  • Older adults demonstrated a significantly smaller decrease in copeptin during the suppression test compared to younger adults (P = .005).

Conclusions:

  • Copeptin kinetics are largely preserved in healthy older adults.
  • The capacity to suppress copeptin levels following hydration is impaired in older individuals.
  • This impaired suppression may contribute to the increased prevalence of hyponatremia observed in the elderly population.