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Related Concept Videos

Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

51
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...
51
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion

95
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...
95
Aging01:26

Aging

349
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
349
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism

34
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...
34
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

30
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...
30
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

33
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...
33

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Related Experiment Video

Updated: Oct 23, 2025

Generalized Psychophysiological Interaction PPI Analysis of Memory Related Connectivity in Individuals at Genetic Risk for Alzheimer's Disease
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Accelerated Epigenetic Aging in Peripheral Blood does not Predict Dementia Risk.

P D Fransquet1, P Lacaze1, R Saffery2

  • 1School of Public Health and Preventive Medicine, Monash University, Melbourne, 3004, Victoria, Australia.

Current Alzheimer Research
|August 25, 2021
PubMed
Summary
This summary is machine-generated.

Accelerated epigenetic aging, measured by DNA methylation clocks, did not strongly predict dementia risk in this study. While some acceleration was noted in males, overall findings suggest limited predictive value for dementia.

Keywords:
Accelerated AgingDNA methylationdementiaepigenetic clockgrimAgehannumhorvathphenoAge.

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Area of Science:

  • Epigenetics
  • Aging Research
  • Neurodegenerative Diseases

Background:

  • Epigenetic age acceleration is linked to increased mortality and disease risk.
  • Evidence connecting accelerated epigenetic aging to dementia risk is currently limited.

Purpose of the Study:

  • To investigate if epigenetic biomarkers of aging can predict dementia risk.
  • To address the role of aging as a primary dementia risk factor.

Main Methods:

  • DNA methylation was analyzed in blood samples from 160 participants (73 pre-symptomatic dementia cases, 87 controls) from the ASPirin in Reducing Events in the Elderly study.
  • Epigenetic age was calculated using Horvath, Hannum, GrimAge, and PhenoAge clocks.
  • Age acceleration was determined as the difference between epigenetic and chronological age.

Main Results:

  • No significant difference in overall age acceleration was found between dementia cases and controls.
  • A modest increase in Hannum's intrinsic epigenetic age acceleration was observed in pre-symptomatic male dementia cases (Δ +1.8 years, p = 0.03).

Conclusions:

  • The study found no robust evidence that peripheral blood epigenetic age acceleration predicts dementia risk.
  • Current epigenetic aging biomarkers may have limited utility in predicting dementia onset.