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Related Concept Videos

Drug Dosing: Geriatric Patients01:15

Drug Dosing: Geriatric Patients

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

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

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 not...
Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

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

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

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

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion

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...
Vaccinations01:51

Vaccinations

Overview

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Related Experiment Video

Updated: Jul 9, 2026

Exergaming in Older People Living with HIV Improves Balance, Mobility and Ameliorates Some Aspects of Frailty
07:27

Exergaming in Older People Living with HIV Improves Balance, Mobility and Ameliorates Some Aspects of Frailty

Published on: October 6, 2016

Challenges for vaccination in the elderly.

Richard Aspinall1, Giuseppe Del Giudice, Rita B Effros

  • 1Department of Immunology, Imperial College, London, UK. r.aspinall@imperial.ac.uk

Immunity & Ageing : I & A
|December 13, 2007
PubMed
Summary

Elderly individuals face higher infection risks due to immune system aging (immunosenescence). Enhanced vaccines are crucial to improve immune response and protection in this vulnerable population.

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Last Updated: Jul 9, 2026

Exergaming in Older People Living with HIV Improves Balance, Mobility and Ameliorates Some Aspects of Frailty
07:27

Exergaming in Older People Living with HIV Improves Balance, Mobility and Ameliorates Some Aspects of Frailty

Published on: October 6, 2016

Area of Science:

  • Immunology
  • Gerontology
  • Public Health

Background:

  • Elderly populations exhibit increased susceptibility to infections, posing significant public health challenges.
  • Immunosenescence, the aging of the immune system, underlies this heightened vulnerability but remains incompletely understood.
  • Key changes include impaired innate immunity, thymic involution affecting T cells, and altered T cell populations.

Purpose of the Study:

  • To highlight the multifaceted nature of immunosenescence in the elderly.
  • To underscore the reduced efficacy of conventional vaccines in older adults.
  • To emphasize the need for enhanced vaccine strategies for this demographic.

Main Methods:

  • Review of existing literature on immunosenescence and age-related immune changes.
  • Analysis of cellular and molecular alterations within the aging immune system.
  • Discussion of the implications for vaccine effectiveness in elderly individuals.

Main Results:

  • Immunosenescence involves malfunctioning cellular receptors, reduced naive T cells, altered T cell composition, and modified T cell phenotypes.
  • Replicative senescence of memory cells expressing naive markers contributes to immune decline.
  • Vaccine effectiveness is diminished in the elderly due to these age-related immune changes.

Conclusions:

  • Immunosenescence presents a complex challenge, impacting infection susceptibility and vaccine efficacy in the elderly.
  • Targeted vaccine enhancements are necessary to overcome reduced immune responsiveness.
  • Developing improved vaccines is critical for protecting vulnerable elderly populations from preventable diseases.