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Related Concept Videos

Drug Dosing: Geriatric Patients01:15

Drug Dosing: Geriatric Patients

357
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...
357
Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

324
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...
324
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

344
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...
344
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion

321
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...
321
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

813
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...
813
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism

326
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...
326

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Getting to Compliance in Forced Exercise in Rodents: A Critical Standard to Evaluate Exercise Impact in Aging-related Disorders and Disease
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Physiology Considerations in Geriatric Patients.

Bret D Alvis1, Christopher G Hughes1

  • 1Division of Critical Care Medicine, Department of Anesthesiology, Vanderbilt University School of Medicine, 1211 21st Avenue South, 526 MAB, Nashville, TN 37212, USA.

Anesthesiology Clinics
|August 29, 2015
PubMed
Summary
This summary is machine-generated.

Aging significantly alters body systems, impacting nervous, cardiovascular, respiratory, gastrointestinal, and renal functions. Understanding these physiological changes is crucial for safe geriatric anesthesia.

Keywords:
AgingCardiovascular agingGeriatricNeurologic agingPhysiology

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Area of Science:

  • Geriatric Medicine
  • Anesthesiology
  • Physiology

Background:

  • Aging causes progressive structural, functional, and molecular changes across all major organ systems.
  • These age-related physiological shifts create a complex condition unique to older adults.

Purpose of the Study:

  • To outline the key physiological alterations occurring with aging.
  • To emphasize the importance of considering these changes in geriatric patients receiving general anesthesia.

Main Methods:

  • Review of physiological changes in major organ systems with aging.
  • Analysis of the implications of these changes for general anesthesia in the elderly.

Main Results:

  • Nervous system: cognitive impairments.
  • Cardiovascular system: hypertension, reduced cardiac output.
  • Respiratory system: decreased arterial oxygenation.
  • Gastrointestinal system: delayed gastric emptying, reduced hepatic metabolism.
  • Renal system: diminished glomerular filtration rate.

Conclusions:

  • Age-associated physiological changes necessitate tailored anesthetic management for geriatric patients.
  • A comprehensive understanding of geriatric physiology is essential for optimizing patient safety and outcomes during general anesthesia.