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Drug Dosing: Infants and Children01:29

Drug Dosing: Infants and Children

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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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Pharmacokinetics in Pediatric Patients: Drug Excretion01:26

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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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Dose Size and Dosing Frequency: Determination Methods01:21

Dose Size and Dosing Frequency: Determination Methods

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Determining the optimal dose size and dosing frequency in pharmacotherapy is crucial for achieving therapeutic effectiveness while minimizing adverse effects. This article explores the methodologies employed in determining these parameters, focusing on their significance and interplay to tailor dosing regimens.Dose Size: Dose size refers to the amount of a drug administered in a single dose. It is determined based on the drug's pharmacodynamics and pharmacokinetics properties and...
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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Pharmacokinetics in Pediatric Patients: Drug Distribution01:17

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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 in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant01:25

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In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...
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Dose Estimation in Pediatric Nuclear Medicine.

Frederic H Fahey1, Alison B Goodkind2, Donika Plyku3

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Seminars in Nuclear Medicine
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PubMed
Summary

Pediatric nuclear medicine requires careful radiation dose optimization. Developing better pharmacokinetic and anatomical models for children is crucial for accurate dosimetry and improved imaging practices.

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Whole-body PET/MRI of Pediatric Patients: The Details That Matter
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Area of Science:

  • Pediatric Nuclear Medicine
  • Radiation Dosimetry
  • Medical Imaging

Background:

  • Pediatric nuclear medicine is vital for diagnosing various conditions in children.
  • Radiopharmaceuticals used in nuclear medicine expose patients to ionizing radiation.
  • Children may be more susceptible to radiation's adverse effects than adults.

Purpose of the Study:

  • To highlight the need for optimizing radiation doses in pediatric nuclear medicine.
  • To identify current gaps in understanding pediatric radiation dosimetry.
  • To emphasize the importance of developing child-specific models for accurate dose estimation.

Main Methods:

  • Reviewing existing dosimetry models for radiopharmaceuticals.
  • Identifying the need for improved pharmacokinetic data in children.
  • Recognizing the importance of child-specific anatomical models.
  • Assessing the role and dosimetry of CT in hybrid imaging for pediatric patients.

Main Results:

  • Current dosimetry models require better pediatric-specific data for accuracy.
  • The concept of effective dose may not be appropriate for children due to age-varying radiosensitivity.
  • CT dosimetry in pediatric hybrid imaging needs further investigation.

Conclusions:

  • Addressing knowledge gaps in pediatric dosimetry and radiation risk is essential.
  • Development of accurate, child-specific models will enable better dose optimization.
  • Improved dosimetry will enhance the practice of pediatric nuclear medicine, balancing image quality and radiation safety.