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Related Concept Videos

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Colloids and Suspensions

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Water functions as a solvent accommodating various solutes, which can be categorized under electrolytes and non-electrolytes. Non-electrolytes are usually held together by covalent bonds, restricting them from dissociating in solution, thereby leading to a lack of electrically charged components upon dissolving in water. They are predominantly organic molecules, such as glucose, creatinine, and urea. Electrolytes, on the other hand, are compounds that can break down into ions in water.
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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...
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Crystalloid and Colloid Compositions and Their Impact.

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This review examines crystalloid and colloid intravenous fluids, detailing their electrolyte, acid-base, and rheological effects. Understanding these fluid properties is crucial for safe and effective therapeutic use in critically ill animals.

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Area of Science:

  • Veterinary Medicine
  • Critical Care
  • Pharmacology

Background:

  • Intravenous fluid therapy is essential in managing critically ill animals.
  • A wide array of crystalloid and colloid solutions are available for administration.
  • Understanding the unique properties of each fluid is vital for optimal patient outcomes.

Purpose of the Study:

  • To comprehensively review crystalloid (hypotonic, isotonic, hypertonic) and colloid (synthetic, natural) intravenous fluids.
  • To elucidate the electrolyte, acid-base, colligative, and rheological effects of these fluids.
  • To enhance the understanding of fluid influences on plasma composition, organ systems, and therapeutic efficacy in critical care settings.

Main Methods:

  • Literature review of available crystalloid and colloid intravenous fluid preparations.
  • Analysis of fluid properties including electrolyte content, acid-base balance, oncotic pressure, and viscosity.
  • Evaluation of published data on the safety and efficacy of different fluid types in animal models and clinical cases.

Main Results:

  • Crystalloid fluids vary significantly in tonicity, impacting fluid shifts and electrolyte balance.
  • Colloid solutions differ in molecular size and composition, affecting oncotic pressure and rheology.
  • Each fluid type presents distinct advantages and risks depending on the clinical scenario and patient status.

Conclusions:

  • A thorough understanding of fluid characteristics is paramount for selecting appropriate intravenous solutions.
  • Careful consideration of electrolyte, acid-base, and rheological effects guides safe and effective fluid therapy in veterinary critical care.
  • This review provides a foundation for informed therapeutic decision-making regarding intravenous fluid administration in sick animals.