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Pharmacokinetics in Pediatric Patients: Drug Distribution01:17

Pharmacokinetics in Pediatric Patients: Drug Distribution

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, compared...
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Tonicity describes the amount of solute in a solution. The measure of the tonicity of a solution, or the total amount of solutes dissolved in a specific amount of solution, is called its osmolarity. Three terms—hypotonic, isotonic, and hypertonic—are used to relate the osmolarity of a cell to the osmolarity of the extracellular fluid that contains the cells. In a hypotonic solution, such as tap water, the extracellular fluid has a lower concentration of solutes than the fluid inside the cell,...
Tonicity in Animals00:59

Tonicity in Animals

The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane for different solutes and the concentration of nonpenetrating solutes in the solution within and outside of the cell. If a semipermeable membrane hinders the passage of some solutes but allows water to follow its concentration gradient, water moves from the side with low osmolarity (i.e., less solute) to the side with higher osmolarity (i.e.,...
Tonicity in Plants00:53

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Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity delimits the magnitude and direction of osmosis and results in three possible scenarios that alter the volume of a cell: hypertonicity, hypotonicity, and isotonicity. Due to differences in structure and physiology, tonicity of plant cells is different from that of animal cells in some scenarios.Plants and Hypotonic EnvironmentsUnlike animal cells,...
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Plant cells maintain appropriate osmotic balance in extreme conditions. For instance, plants in dry environments store water in vacuoles, limit the opening of their stoma, and have thick, waxy cuticles to prevent unnecessary water loss. Some species of plants that live in salty environments store salt in their roots. As a result, water osmosis occurs in the root from the surrounding soil.
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Adult and Pediatric Porcine Model of Acute Volume Overload
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[Plasma hypertonicity in children].

Ana Teixeira1, Augusto Ribeiro

  • 1Serviço de Cuidados Intensivos e Intermédios de Pediatria, Unidade Autónoma de Gestão da Mulher e da Criança, Hospital do São João, Porto.

Acta Medica Portuguesa
|July 27, 2010
PubMed
Summary

Plasma hypertonicity in children is a serious condition often caused by hypernatremia. Understanding its causes like dehydration, salt poisoning, and hyperosmolar coma is crucial for effective treatment.

Area of Science:

  • Pediatric Endocrinology
  • Clinical Chemistry
  • Nephrology

Context:

  • Plasma hypertonicity is a frequent and severe pediatric disorder.
  • Common etiologies include hypernatremia-related conditions, hyperglycemia, and exogenous solute accumulation.
  • Effective management necessitates a deep understanding of hydroelectrolytic imbalances.

Purpose:

  • To provide a theoretical review of plasma hypertonicity in pediatric patients.
  • To focus on the three most prevalent associated conditions: hypernatremic dehydration, salt poisoning, and hyperosmolar coma.

Summary:

  • This review examines the pathophysiology and clinical presentation of plasma hypertonicity in children.
  • Key conditions discussed include hypernatremic dehydration, salt poisoning, and hyperosmolar coma.

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  • The importance of accurate diagnosis and tailored treatment strategies for hydroelectrolytic disorders is emphasized.

    • Impact:

    • Enhances clinical understanding of pediatric plasma hypertonicity.
    • Aids healthcare professionals in diagnosing and managing critical pediatric electrolyte disturbances.
    • Contributes to improved patient outcomes by highlighting the complexities of hypertonicity management.