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Related Concept Videos

Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

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

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion

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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 Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

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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 Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

21
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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Two-Way ANOVA01:17

Two-Way ANOVA

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The two-way ANOVA is an extension of the one-way ANOVA. It is a statistical test performed on three or more samples categorized by two factors - a row factor and a column factor. Ronald Fischer mentioned it in 1925 in his book 'Statistical Methods for Researchers.'
The two-way ANOVA analysis initially begins by stating the null hypothesis that there is an interaction effect between the two factors of a dataset. This effect can be visualized using line segments formed by joining the...
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism

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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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Related Experiment Video

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Do Age and Sex Influence Anorectal Manometry Parameters?

Gabrielle Jutras1, George Wahba1, Eloise Ayuso1

  • 1Centre Hospitalier Universitaire de l'Université de Montréal (CHUM), Montréal, Québec, Canada.

Journal of the Canadian Association of Gastroenterology
|October 7, 2021
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Age and sex significantly impact anorectal manometry (HRM) results. Understanding these factors is crucial for accurate interpretation of digestive function in patients undergoing HRM assessments.

Keywords:
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Area of Science:

  • Gastroenterology and Digestive Health
  • Physiology
  • Gerontology

Background:

  • High-resolution anorectal manometry (HRM) is a key diagnostic tool for anal incontinence and constipation.
  • The influence of aging and comorbidities on anorectal physiological parameters requires further elucidation.
  • This study investigates the specific effects of age on anorectal function.

Purpose of the Study:

  • To determine the impact of chronological age on key anorectal manometry parameters.
  • To identify age-related changes in rectal compliance and volume thresholds.
  • To assess the independent effects of age and other factors on anorectal function.

Main Methods:

  • Retrospective analysis of 144 patients with normal HRM results from January 2016 to May 2019.
  • Collection of clinical data and anorectal manometry parameters.
  • Multivariate regression analysis to evaluate age, sex, comorbidities, and obstetric history effects.

Main Results:

  • Age positively correlated with maximum tolerable volume and rectal compliance.
  • Females exhibited significantly lower squeeze pressures and volume at first urge compared to males, irrespective of age.
  • Vaginal birth history was associated with reduced maximum tolerable pressure.

Conclusions:

  • Age and sex are independent determinants of anorectal manometry parameters.
  • These demographic factors must be considered during the interpretation of HRM findings.
  • Clinical evaluation should account for age and sex influences on anorectal physiology.