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Related Concept Videos

Drug Dosing: Geriatric Patients01:15

Drug Dosing: Geriatric Patients

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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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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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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 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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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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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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Immune System Dysfunction in the Elderly.

Eduardo Fuentes1,2, Manuel Fuentes1, Marcelo Alarcón1

  • 1Platelet Research Laboratory, Department of Clinical Biochemistry and Immunohematology, Faculty of Health Sciences, Interdisciplinary Excellence Research Program on Healthy Aging/ PIEI-ES, Universidad de Talca, Postal Code 3460000, Casilla 747, Talca, Chile.

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Aging significantly impacts the immune system, leading to immunosenescence, characterized by reduced immune function and increased susceptibility to disease in older adults. Understanding these changes is crucial for developing effective immune senescence treatments.

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Area of Science:

  • Immunology
  • Gerontology
  • Cellular Biology

Background:

  • Human aging involves physical and physiological frailty, significantly impacting the immune system.
  • Immunosenescence describes age-associated changes in both innate and adaptive immunity.
  • Elderly individuals often experience chronic inflammation, increased infection rates, and higher incidence of chronic diseases.

Purpose of the Study:

  • To explore the function of the immune system during the aging process.
  • To investigate the impact of aging on the interplay between innate and adaptive immunity.
  • To identify potential biomarkers for evaluating immune senescence treatments.

Main Methods:

  • Review of existing literature on immunosenescence.
  • Analysis of age-related alterations in immune cell function.
  • Exploration of the interplay between innate and adaptive immunity in aging.

Main Results:

  • Aging leads to a decline in both adaptive and innate immune functions (immunosenescence).
  • Elderly individuals exhibit chronic low-level inflammation and are more prone to infections and chronic diseases.
  • The precise impact of aging on the integrated function of the immune system requires further investigation.

Conclusions:

  • Immunosenescence is a key characteristic of aging, affecting immune system efficacy.
  • Further research into immune system alterations during aging may yield valuable biomarkers for therapeutic interventions.
  • Understanding age-associated immune changes is vital for improving health outcomes in the elderly.