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Related Concept Videos

Colloids and Suspensions01:17

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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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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Colloids03:22

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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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Capillary beds are networks of tiny blood vessels that play a crucial role in the circulatory system. These beds are where the exchange of gases, nutrients, and waste products occurs between the blood and surrounding tissues. Each capillary bed consists of numerous capillaries, which are the smallest blood vessels in the body, typically only one cell-thick. This thinness allows for the efficient diffusion of substances.
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Fluid Connective Tissues: Blood and Lymph01:20

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Blood and lymph are fluid connective tissues. They contain cells, also known as formed elements, circulating in a liquid extracellular matrix, the plasma. The formed elements are derived from hematopoietic stem cells in the bone marrow. Blood and lymph connect all vital parts and carry nutrients, oxygen, and other essential molecules like antibodies.
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Capillaries, a crucial constituent of the circulatory system, are diminutive vessels with a diameter between 5–10 micrometers, accommodating perfusion to the tissues through the phenomenon known as microcirculation. Through their permeable walls, consisting of an endothelial layer ensconced by a basement membrane and sporadically dispersed smooth muscle fibers, the exchange of substances between the blood and the interstitial fluid becomes plausible. Variance in wall composition exists,...
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Endothelialized Microfluidics for Studying Microvascular Interactions in Hematologic Diseases
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Colloids and the Microcirculation.

Huaiwu He1, Dawei Liu1, Can Ince2,3

  • 1From the Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China.

Anesthesia and Analgesia
|November 4, 2017
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Summary
This summary is machine-generated.

Colloid solutions may improve fluid resuscitation by enhancing intravascular retention compared to crystalloids. This review examines colloid properties and their microcirculatory effects in hypovolemia and shock.

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Area of Science:

  • Critical care medicine
  • Physiology
  • Pharmacology

Background:

  • Hypovolemia necessitates fluid resuscitation to restore circulatory volume.
  • Colloid solutions are proposed to improve intravascular fluid retention over crystalloids.
  • Microcirculatory perfusion is critical for tissue oxygenation during resuscitation.

Purpose of the Study:

  • To review the physiochemical properties of various colloid solutions.
  • To evaluate the effects of colloids versus crystalloids on microcirculation during hypovolemia.
  • To explore colloid benefits in recruiting microcirculation during shock.

Main Methods:

  • Literature review of experimental and clinical studies.
  • Analysis of physiochemical properties of different colloid types (gelatin, dextrans, HES, albumin).
  • Examination of microcirculatory responses to fluid resuscitation in hypovolemic models.

Main Results:

  • Colloids generally demonstrate greater intravascular retention than crystalloids.
  • Specific colloid types exhibit varied effects on microcirculatory parameters.
  • Evidence suggests potential benefits of colloids in improving microcirculatory recruitment.

Conclusions:

  • Colloid solutions offer distinct physiochemical properties influencing fluid dynamics.
  • Their impact on microcirculation during hypovolemia warrants further investigation.
  • Understanding colloid behavior is crucial for optimizing fluid resuscitation strategies.