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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism

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 Distribution

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 Excretion

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...

Effect of Hepatic Disease on Pharmacokinetics: Dose Adjustments Due to Hepatic Impairment

Effect of Hepatic Disease on Pharmacokinetics: Dose Adjustments Due to Hepatic Impairment

Hepatic impairment, characterized by decreased liver function, does not uniformly mandate adjustments in drug dosage. Whether dosage modifications are necessary depends on various factors related to the drug's metabolism and elimination pathways. If a drug is primarily excreted via the kidneys and bypasses significant hepatic processing, if it undergoes minimal metabolic transformation in the liver, or if it is volatile and primarily expelled through the lungs, dose adjustments may not be...

Drug Dosing: Geriatric Patients

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 Absorption

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

Extended 78% Hepatectomy in a Mouse Surgical Model

Extended 78% Hepatectomy in a Mouse Surgical Model

Published on: May 24, 2024

Hepatectomy in elderly patients: does age matter?

Yanming Zhou, Xiaofeng Zhang, Zuobing Zhang

World Journal of Surgery

|August 21, 2013

Summary

This summary is machine-generated.

Elderly patients undergoing liver surgery (hepatectomy) face higher complication rates, primarily cardiac issues and delirium. However, major surgical complications, mortality, and long-term survival are comparable to younger patients.

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Published on: June 16, 2023

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Last Updated: May 8, 2026

Extended 78% Hepatectomy in a Mouse Surgical Model

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Published on: May 24, 2024

Modified Laparoscopic Anatomic Hepatectomy: Two-Surgeon Technique Combined with the Simple Extracorporeal Pringle Maneuver

Modified Laparoscopic Anatomic Hepatectomy: Two-Surgeon Technique Combined with the Simple Extracorporeal Pringle Maneuver

Published on: June 16, 2023

Area of Science:

Hepatobiliary surgery
Geriatric surgery
Surgical outcomes research

Background:

Increasing life expectancy leads to a rise in elderly patients requiring liver surgery.
Hepatectomy is a complex procedure with potential risks, especially in older populations.

Purpose of the Study:

To evaluate the safety and efficacy of hepatectomy in elderly patients (≥70 years).
To compare outcomes of hepatectomy in elderly versus younger patient cohorts.

Main Methods:

Meta-analysis of 28 observational studies including 15,480 patients.
Data pooled and analyzed using RevMan 5.0 software.
Comparison of postoperative complications, mortality, and survival rates between age groups.

Main Results:

Elderly patients had significantly more overall complications (31.8% vs 28.7%), mainly cardiac complications and delirium.
Postoperative major surgical complications (12.6% vs 11.3%) and mortality (3.6% vs 3.3%) were comparable between elderly and younger patients.
Five-year disease-free survival (26.5% vs 26.3%) and overall survival (39.5% vs 40.7%) were similar for patients with malignancies.

Conclusions:

Age alone should not be a contraindication for hepatectomy.
Elderly patients experience similar major surgical outcomes and long-term survival compared to younger patients.
Careful patient selection and management are crucial for optimizing hepatectomy outcomes in the elderly.