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

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

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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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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 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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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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Informed Consent and Cognitive Dysfunction After Noncardiac Surgery in the Elderly.

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Post-surgery cognitive dysfunction in elderly patients occurs in 10-15% of cases, impacting memory and executive function. Informed consent requires discussing these risks and alternatives before noncardiac surgery.

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Area of Science:

  • Geriatric Medicine
  • Surgical Outcomes
  • Neuroscience

Background:

  • Cognitive dysfunction is a potential complication following noncardiac surgery in elderly individuals.
  • Existing protocols do not adequately address the informed consent process regarding these cognitive risks.

Purpose of the Study:

  • To evaluate the incidence and nature of cognitive dysfunction occurring 3 months after noncardiac surgery in the elderly.
  • To assess whether these risks meet informed consent thresholds for foreseeability and materiality.
  • To highlight the necessity of discussing surgical risks and alternatives for informed consent.

Main Methods:

  • The study assessed cognitive function in elderly patients before and 3 months after noncardiac surgery.
  • Foreseeability and materiality of cognitive dysfunction were evaluated against informed consent standards.

Main Results:

  • Cognitive dysfunction was observed in 10%-15% of elderly patients 3 months post-surgery.
  • New deficits in memory and executive function were noted in patients with previously normal cognitive tests.
  • These findings meet established thresholds for informed consent.

Conclusions:

  • The risk of post-surgical cognitive dysfunction in the elderly is significant enough to warrant explicit discussion during the informed consent process.
  • Failure to disclose these risks may compromise the validity of consent.
  • Patients must be informed about cognitive risks and alternative treatments before scheduling noncardiac surgery.