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Pharmacokinetics in Pediatric Patients: Drug Excretion01:26

Pharmacokinetics in Pediatric Patients: Drug Excretion

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In pediatric medicine, understanding the renal function and drug elimination nuances is crucial for administering safe and effective treatments. Newborns, in particular, display markedly slower renal functions than adults, profoundly affecting how drugs are cleared from their bodies. This slower drug clearance requires clinicians to extend the dosing intervals for many medications to prevent drug accumulation and toxicity while ensuring therapeutic efficacy.One key area where these adjustments...
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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 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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Pathophysiology of Vomiting01:22

Pathophysiology of Vomiting

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Vomiting is a complex physiological response to expel harmful or irritating substances from the body. It's a defensive mechanism triggered by stimuli like poisons, microbial toxins, cytotoxic drugs, and mechanical abdominal distension. The process is centrally coordinated by the vomiting (or emetic) center located in the medulla of the brainstem. This area, rich in muscarinic M1, histamine H1, neurokinin 1 (NK1), and serotonin 5-HT3 receptors, coordinates the act of vomiting through...
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Pharmacokinetics in Pediatric Patients: Drug Distribution01:17

Pharmacokinetics in Pediatric Patients: Drug Distribution

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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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Drug Dosing: Infants and Children01:29

Drug Dosing: Infants and Children

168
Pediatric patient dosages diverge from adults due to disparities in body surface area, total body water, and extracellular fluid per kilogram of body weight. The dosing regimen considers the variations in pharmacokinetics and pharmacology across distinct age groups, encompassing preterm newborns, infants, young children, older children, and adolescents. Calculation of pediatric patient doses is predicated on determining body surface area, which exhibits a superior correlation with the child's...
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Related Experiment Video

Updated: Dec 18, 2025

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
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Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

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Pediatric Syncope: A Systematic Review.

Rennette Zavala1, Benjamin Metais2, Lynnia Tuckfield3

  • 1From the University of Colorado Anschutz Medical Campus, Aurora, CO.

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Pediatric syncope is common, with most cases stemming from benign causes like vasovagal episodes. A thorough history and physical exam are key for diagnosis, as serious conditions are rare.

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Area of Science:

  • Pediatrics
  • Cardiology
  • Neurology

Background:

  • Syncope is a frequent concern in pediatric care.
  • Understanding the diverse causes of syncope in children is crucial for accurate diagnosis and management.
  • Previous reviews have not systematically analyzed the etiologies of pediatric syncope.

Purpose of the Study:

  • To conduct the first systematic review on pediatric syncope etiologies.
  • To identify and quantify the most common causes of syncope in individuals aged 21 years or younger.
  • To determine credible intervals for the prevalence of different syncope diagnoses.

Main Methods:

  • Systematic review adhering to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines.
  • Searched Embase, Scopus, PubMed, and Cochrane Controlled Trial databases for relevant studies.
  • Included studies with at least 10 pediatric patients (≤21 years) diagnosed with syncope, using standard definitions.

Main Results:

  • Eleven studies involving 3,700 pediatric patients were analyzed.
  • The most frequent causes were vasovagal syncope (52.2%), followed by postural orthostatic tachycardia syndrome (13.1%), and cardiac causes (4.0%).
  • A significant proportion of cases (18.3%) remained undiagnosed.

Conclusions:

  • Syncope is a common pediatric issue, predominantly caused by non-serious conditions.
  • Clinical evaluation, including detailed history and physical examination, is paramount for diagnosing pediatric syncope.
  • The majority of pediatric syncope cases are diagnosed through clinical assessment or with minimal testing.