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Related Concept Videos

Criteria for Causality: Bradford Hill Criteria - II01:28

Criteria for Causality: Bradford Hill Criteria - II

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The Bradford Hill criteria serve as guidelines for establishing causative links in epidemiological research. Beyond Strength, Consistency, Specificity, and Temporality, key criteria also include Biological Gradient, Plausibility, Coherence, Experiment, and Analogy. These principles assist scientists in assessing the likelihood of causation in complex biological contexts. Below is a summary of these concepts:
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Criteria for Causality: Bradford Hill Criteria - I01:30

Criteria for Causality: Bradford Hill Criteria - I

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The Bradford Hill criteria are a group of principles that provide a framework to determine a causal relationship between a specific factor and a disease. There are nine criteria that are pivotal in assessing causality in epidemiological studies. Here's a closer look at Strength, Consistency, Specificity, and Temporality criteria with definitions and examples:
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Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
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Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

Criteria for Aromaticity and the Hückel 4n + 2 Rule

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Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?  
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or the 4n +...
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Tissue Transplantation01:24

Tissue Transplantation

946
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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Kidney Transplant I: Introduction01:28

Kidney Transplant I: Introduction

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A kidney transplant is a surgical approach that involves replacing a non-functioning kidney with a healthy one from a donor. This procedure is often a treatment option for end-stage renal disease (ESRD) patients. The method requires careful recipient selection, including evaluating various medical and psychosocial factors. These criteria vary between transplant centers but generally include assessments of the patient's overall health, adherence to medical recommendations, and lifestyle...
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Porcine Liver Transplantation Without Veno-Venous Bypass As an Extended Criteria Donor Model
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Malleable Transplant Criteria: At What Cost?

Angel Alsina, Rebekah Apple, Nyingi Kemmer

    Narrative Inquiry in Bioethics
    |April 30, 2019
    PubMed
    Summary

    Physicians should prioritize individual patient care over societal cost-benefit analysis in transplants. However, flexible transplant criteria can erode public trust, necessitating independent ethics committees for oversight.

    Area of Science:

    • Medical Ethics
    • Transplant Surgery
    • Health Economics

    Background:

    • A rare liver disease led to a liver transplant in an 18-year-old male outside standard hepatopulmonary syndrome (HPS) criteria.
    • The patient experienced complications, requiring urgent re-listing and incurring over $5 million in hospital charges.

    Observation:

    • The case highlights the ethical dilemma of balancing individual patient needs against societal healthcare resource allocation.
    • It also raises concerns about the impact of adaptable transplant selection criteria on public confidence.

    Findings:

    • Physicians' primary obligation is to the patient, not to justify societal financial investments or limit beneficence for cost containment.
    • Deviations from established criteria, especially when combined with potential manipulation, can undermine public trust in the transplant process.

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    Left Lung Orthotopic Transplantation in a Juvenile Porcine Model for ESLP
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    Implications:

    • Transplant centers should establish independent ethics committees to review complex cases and ensure fair patient selection.
    • Maintaining public trust in organ transplantation requires transparent and consistent application of eligibility criteria.