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Related Concept Videos

Pharmacokinetics in Pediatric Patients: Drug Metabolism01:24

Pharmacokinetics in Pediatric Patients: Drug Metabolism

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In pediatric care, understanding the nuances of hepatic drug metabolism is crucial, as it significantly differs from that of adults. This divergence is primarily due to the developmental stage of drug-metabolizing enzymes, which affects how medications are processed in the body. In neonates, for instance, the activity of Phase I enzymes—critical for the initial breakdown of drugs—is markedly reduced, functioning at just 20–40% of the levels seen in adults. This reduction poses...
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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 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 Pediatric Patients: Overview and Drug Absorption01:23

Pharmacokinetics in Pediatric Patients: Overview and Drug Absorption

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Understanding the physiological differences in the pediatric population is crucial for effective pharmacotherapy. Neonates, infants, and children exhibit significant variations in gastric pH, gastric emptying time, intestinal transit time, and biliary function. These variations profoundly affect oral drug absorption, necessitating a nuanced approach to pediatric dosing.Neonates present with a unique physiological profile, having a gastric pH greater than 4 and faster and more irregular gastric...
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Hepatic Drug Excretion: Influencing Factors01:16

Hepatic Drug Excretion: Influencing Factors

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The biliary system of the liver, crucial for bile secretion and drug excretion, comprises intrahepatic bile ducts that merge to form the common hepatic duct. This duct, carrying hepatic bile, combines with the cystic duct, draining the gallbladder and forming the common bile duct, which empties into the duodenum. Bile, produced by hepatic cells lining the bile canaliculi, is composed primarily of water, bile salts, pigments, electrolytes, and lesser amounts of cholesterol and fatty acids. Bile...
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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

131
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: Dec 8, 2025

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport
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Changes in conjugated urinary bile acids across age groups.

Keiko Sato1, Genta Kakiyama2, Mitsuyoshi Suzuki1

  • 1Department of Pediatrics, Juntendo University, Faculty of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan.

Steroids
|September 22, 2020
PubMed
Summary
This summary is machine-generated.

Urinary bile acids change significantly from birth to adulthood, with peak excretion around 6-8 days after birth. A shift in bile acid conjugation from taurine to glycine occurs by 2-4 months old.

Keywords:
ConjugationHydrophobicityLC-MS/MSPhysiologic cholestasisUrinary bile acids

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Real Time Monitoring of Intracellular Bile Acid Dynamics Using a Genetically Encoded FRET-based Bile Acid Sensor
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Area of Science:

  • Biochemistry
  • Pediatrics
  • Metabolomics

Background:

  • Bile acid composition undergoes significant changes post-birth and with aging.
  • Understanding the transition of conjugated urinary bile acids offers noninvasive insights into hepatic function.
  • Previous studies have not detailed the neonatal to adult urinary bile acid profile shifts.

Purpose of the Study:

  • To investigate age-related differences in urinary bile acid species, conjugation rates, and patterns.
  • To characterize bile acid profiles across different age groups from neonates to adults.
  • To establish a baseline for normal urinary bile acid transitions.

Main Methods:

  • Analysis of spot urine samples from 92 healthy individuals (birth to 58 years).
  • Utilized liquid chromatography-tandem mass spectrometry (LC/ESI-MS/MS) for precise measurement.
  • Systematically determined 66 unconjugated and conjugated bile acid species.

Main Results:

  • Observed a dramatic shift in urinary bile acids post-birth, from fetal types to mature forms (CA, CDCA).
  • Peak bile acid excretion occurred 6-8 days after birth, followed by a steady decline.
  • A significant change in bile acid conjugation from taurine to glycine was noted at 2-4 months of age.

Conclusions:

  • The study provides crucial data on the developmental transitions in bile acid biosynthesis and conjugation.
  • Findings support the presence of physiological cholestasis in neonates.
  • The results shed light on the establishment of infant intestinal bacterial flora and its impact on bile acids.