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Related Concept Videos

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

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism

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...
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...
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...

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Related Experiment Video

Updated: May 8, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
14:09

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

Published on: March 21, 2013

Gender differences in orthostatic tolerance in the elderly.

Marte Rognstad Mellingsæter1, Vegard Bruun Wyller, Torgeir Bruun Wyller

  • 1Department of Geriatric Medicine, Oslo University Hospital, Oslo, Norway, cmelling@online.no.

Aging Clinical and Experimental Research
|August 31, 2013
PubMed
Summary
This summary is machine-generated.

Elderly men exhibit poorer orthostatic tolerance than women, with higher syncope risk. This suggests vascular autonomic control differences may explain gender disparities in elderly orthostatic intolerance.

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Related Experiment Videos

Last Updated: May 8, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
14:09

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Published on: March 21, 2013

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People
12:59

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Published on: July 5, 2017

Area of Science:

  • Gerontology
  • Cardiovascular Physiology
  • Autonomic Nervous System Function

Background:

  • Orthostatic tolerance in the elderly is not well understood, particularly concerning gender-specific differences.
  • Aging is associated with changes in cardiovascular regulation, impacting the ability to maintain blood pressure upon standing.

Purpose of the Study:

  • To investigate gender differences in orthostatic tolerance among healthy elderly individuals.
  • To explore potential underlying physiological mechanisms, including autonomic nervous system function, contributing to these differences.

Main Methods:

  • 48 healthy elderly participants (24 women, 24 men, >65 years) underwent head-up tilt (HUT) tests at 30° and 70°.
  • Measurements included blood pressure, stroke volume, total peripheral resistance, heart rate variability, and baroreceptor sensitivity.
  • Test terminations due to vasovagal syncope or presyncope were recorded.

Main Results:

  • Women had lower body mass index and blood pressure at rest and during tilt compared to men.
  • Elderly men experienced significantly higher rates of vasovagal syncope (33%) compared to women (9%).
  • Higher resting heart rate was the sole predictor of syncope risk.

Conclusions:

  • Elderly men demonstrate reduced orthostatic tolerance compared to women under prolonged postural stress.
  • Observed gender differences in orthostatic tolerance may stem from variations in vascular autonomic control rather than cardiac autonomic regulation.