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Related Concept Videos

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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Esophageal varices often manifest as gastrointestinal bleeding episodes, presenting symptoms like hematemesis (vomiting of blood), hematochezia (passing fresh blood via the rectum), and melena (black, tarry stools). Other signs can include weight loss, anorexia, abdominal discomfort, jaundice, pruritus, altered mental status, and muscle cramps.
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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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Drug distribution in the pediatric population exhibits unique challenges and considerations due to the physiological differences between children, particularly neonates and infants, and adults. A crucial aspect of pediatric pharmacology is understanding how these differences impact the pharmacokinetics of various drugs, necessitating age-specific dosing strategies to ensure efficacy and safety.Neonates and infants have a higher total body water content, ~75%–90% of their body weight,...
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Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test

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In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess...
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Related Experiment Video

Updated: Nov 14, 2025

Isolation of Neonatal Extrahepatic Cholangiocytes
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A Patient with neonatal cholestasis.

Kristl G Claeys1,2, Luc Breysem3, Eric Legius4,5

  • 1Department of Neurology, University Hospital Leuven, Leuven, Belgium.

Journal of Mother and Child
|March 8, 2021
PubMed
Summary

This study identifies a novel pathogenic variant in the SLC7A2 gene associated with elevated arginine and lysine levels in a family. The findings contribute to understanding genetic contributions to amino acid metabolism disorders.

Keywords:
CAT-2Gilbert syndromedynamin-2 deficiencypolyostotic fibrous dysplasia

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Area of Science:

  • Genetics
  • Metabolic Disorders
  • Neurology

Background:

  • McCune-Albright syndrome is a rare genetic disorder.
  • Charcot-Marie-Tooth neuropathy is a group of inherited disorders.
  • Gilbert syndrome is a common liver condition.

Purpose of the Study:

  • To investigate the genetic basis of polyostotic fibrous dysplasia, Charcot-Marie-Tooth neuropathy, and amino acid level abnormalities in a patient and his family.
  • To identify novel genetic variants contributing to these conditions.

Main Methods:

  • Clinical examination and genetic analysis of the patient and his family members.
  • Whole exome sequencing to identify pathogenic variants.
  • Biochemical analysis of plasma amino acid levels.

Main Results:

  • The patient presented with McCune-Albright syndrome, Charcot-Marie-Tooth neuropathy due to a DNM2 mutation, and Gilbert syndrome.
  • A novel pathogenic SLC7A2 variant was identified in the patient and affected family members, correlating with increased plasma arginine and lysine levels.

Conclusions:

  • The study highlights a novel SLC7A2 variant as a likely cause of familial hyperargininemia and hyperlysinemia.
  • Genetic factors play a significant role in the complex phenotype observed in this family, including neurological and metabolic manifestations.