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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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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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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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Aging01:26

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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.
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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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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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A harmonized frailty index using global aging data.

Benjamin Seligman1,2, Mark Ward3, Maddalena Ferranna4

  • 1Greater Los Angeles Geriatric Research, Education, and Clinical Center, VA Greater Los Angeles Health Care System, Los Angeles, California, United States.

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
|October 10, 2025
PubMed
Summary
This summary is machine-generated.

A new harmonized frailty index (FI) was developed for older adults globally. This tool shows that increased frailty is strongly linked to higher mortality risk across diverse populations.

Keywords:
EpidemiologyFrailtyGlobal healthPublic health

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Area of Science:

  • Gerontology
  • Public Health
  • Epidemiology

Background:

  • Frailty is a prevalent geriatric syndrome linked to adverse health outcomes.
  • Harmonizing frailty measurement across diverse global settings remains a challenge.
  • A standardized definition is crucial for comparative health research.

Purpose of the Study:

  • To develop and validate a harmonized frailty index (FI) using shared variables from multiple international health surveys.
  • To assess the association between the harmonized FI and mortality across different socioeconomic contexts.

Main Methods:

  • Analysis of data from 184,715 adults aged 50+ across eight international health and retirement surveys.
  • Construction of a 30-item deficit accumulation frailty index (FI) using common variables.
  • Assessment of frailty distributions and association with mortality in four specific surveys (HRS, MHAS, SHARE, TILDA).

Main Results:

  • The mean frailty index (FI) was 0.196, with 39.2% of participants classified as frail.
  • Frailty distributions were right-skewed and higher in females than males.
  • Severe frailty (FI ≥ 0.4) was strongly associated with increased mortality risk across all analyzed surveys (p < 0.0001).

Conclusions:

  • A harmonized frailty index (FI) has been successfully developed using international data.
  • The FI demonstrates a significant association with mortality, validating its use in global aging research.
  • This tool aids in understanding aging processes and health disparities worldwide.