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Related Concept Videos

Compartment Models: Two-Compartment Model01:20

Compartment Models: Two-Compartment Model

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The two-compartment model divides the body into central and peripheral compartments to account for varying blood perfusion rates among organs and tissues, affecting drug distribution. The central compartment includes blood and highly perfused tissues with rapid drug distribution, while the peripheral compartment contains tissues with slower drug distribution. After a single IV bolus dose, the drug concentration is high in plasma and low in tissues. The drug distribution between compartments...
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Factors Affecting Drug Distribution: Organ Perfusion Rate01:15

Factors Affecting Drug Distribution: Organ Perfusion Rate

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Drug distribution within the body is a complex process influenced by several factors, including perfusion rate, the rate at which the bloodstream transports drugs to tissue. This limitation becomes particularly significant when dealing with highly lipophilic drugs. In such cases, the rate at which the drug can move across membranes is crucial, and if the membrane is highly permeable to the drug, distribution becomes rate-limited by perfusion.
Perfusion rate-limited distribution relies on the...
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Two-Compartment Open Model: Extravascular Administration01:12

Two-Compartment Open Model: Extravascular Administration

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The two-compartment model for extravascular administration represents a drug's absorption and distribution process. It features a central compartment, where the drug is first absorbed, and a peripheral compartment, which illustrates the drug's distribution throughout the body. The rate of change in drug concentration in the central compartment is calculated by three exponents: absorption, distribution, and elimination.
The absorption exponent (ka) indicates the speed at which the drug...
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Tissue Transplantation01:24

Tissue Transplantation

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Tissue transplantation is a significant medical procedure involving the transfer of cells, tissues, or organs from a donor to a recipient, with the primary aim of restoring lost functions. This procedure is crucial in treating a broad spectrum of diseases, including kidney diseases, liver failure, heart disease, and certain types of cancers.
The Biology of Tissue Transplantation
The biology of tissue transplantation hinges on the Major Histocompatibility Complex (MHC) molecules. These molecules...
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Uniform Distribution01:19

Uniform Distribution

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The uniform distribution is a continuous probability distribution of events with an equal probability of occurrence. This distribution is rectangular.
Two essential properties of this distribution are
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Drug Distribution: Tissue Binding01:21

Drug Distribution: Tissue Binding

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Upon entering the systemic circulation, drugs can distribute into the interstitial and intracellular fluid of various tissue cells. This distribution is facilitated by the binding of drugs to different cellular components within tissues, which may lead to drug accumulation in specific areas. Drugs bound to tissue components serve as reservoirs that release free drugs back into the system, prolonging the drug's overall action. However, this accumulation can also result in local toxicity.
For...
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Study of Experimental Organ Donation Models for Lung Transplantation
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Continuous distribution as an organ allocation framework.

Bertram L Kasiske1,2, Joshua Pyke2, Jon J Snyder2,3

  • 1Hennepin County Medical Center.

Current Opinion in Organ Transplantation
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The Scientific Registry of Transplant Recipients (SRTR) and Organ Procurement and Transplantation Network (OPTN) are exploring continuous distribution for liver allocation, moving away from geographic boundaries to prioritize individual patient needs and medical urgency.

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Area of Science:

  • Transplantation science
  • Public health policy
  • Medical ethics

Background:

  • The Organ Procurement and Transplantation Network (OPTN) aims to align liver allocation with the Final Rule.
  • Geographic boundaries in organ allocation have been a subject of review.
  • The Scientific Registry of Transplant Recipients (SRTR) plays a role in supporting OPTN initiatives.

Purpose of the Study:

  • To review literature on removing geographic factors from organ allocation.
  • To describe how SRTR can aid in developing new OPTN policies.
  • To explore the transition towards continuous distribution in liver allocation.

Main Methods:

  • Literature review of studies on organ allocation policy.
  • Analysis of the potential role of SRTR data in policy development.
  • Examination of the concept of continuous distribution.

Main Results:

  • The OPTN endorsed developing organ allocation policies without geographic boundaries ('continuous distribution') in December 2018.
  • Objections to wider organ distribution often focus on regional inequities rather than individual patient needs.
  • Continuous distribution aims to merge ethical-medical urgency with geographic feasibility for equitable patient care.

Conclusions:

  • Removing geographic boundaries from organ distribution is a controversial but evolving area.
  • Continuous distribution systems may help focus policy debates on patient-centered priorities.
  • SRTR's capabilities can support the OPTN's policy development process for a more equitable system.