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Related Concept Videos

Hypersensitivities01:30

Hypersensitivities

Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
Pneumonia II: Pathophysiology01:29

Pneumonia II: Pathophysiology

The pathophysiology of pneumonia involves the following steps:
Pneumonia I: Introduction01:29

Pneumonia I: Introduction

Pneumonia is an infection of the lower respiratory tract that leads to inflammation of the lung parenchyma, often resulting in the accumulation of inflammatory exudate in the alveoli and airways. Unlike the watery, low-protein fluid exudate in pulmonary edema, the exudate in this case is a thick fluid rich in immune cells, proteins, and debris produced during infection and inflammation.This impairs gas exchange and can lead to consolidation of lung tissue. The infection may be caused by a...
Pneumonia I: Introduction01:30

Pneumonia I: Introduction

Pneumonia is an acute respiratory infection that targets the lungs, specifically the alveoli. These tiny air sacs, essential for oxygen exchange, become engorged with pus and fluid, severely hindering breathing, decreasing oxygen absorption, and causing significant pain and discomfort during respiration.
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
Asthma I: Introduction01:28

Asthma I: Introduction

Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...

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Related Experiment Video

Updated: May 20, 2026

Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices
12:04

Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices

Published on: May 9, 2018

Chapter 19: Hypersensitivity pneumonitis.

Karen Hsu Blatman, Leslie C Grammer

    Allergy and Asthma Proceedings
    |July 17, 2012
    PubMed
    Summary

    Hypersensitivity pneumonitis (HP), an allergic lung inflammation, is diagnosed using six key predictors. Early detection and understanding of immune responses are crucial for managing this condition.

    Area of Science:

    • Pulmonary Medicine
    • Immunology
    • Environmental Health

    Background:

    • Hypersensitivity pneumonitis (HP), or extrinsic allergic alveolitis, is a non-IgE-mediated lung inflammation caused by inhaled antigens.
    • Etiologic agents include organic compounds (bacteria, fungi, proteins) and inorganic haptens (isocyanates, drugs).

    Purpose of the Study:

    • To outline the key diagnostic predictors and clinical stages of hypersensitivity pneumonitis.
    • To describe the immunologic mechanisms involved in HP.

    Main Methods:

    • Identification of six significant predictors for diagnostic accuracy (∼95%).
    • Description of clinical presentation across acute, subacute, and chronic stages.
    • Analysis of immunologic markers including bronchoalveolar lavage findings.

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    Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices
    12:04

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    Published on: May 9, 2018

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    Published on: January 20, 2023

    Main Results:

    • Six predictors include allergen exposure, positive antibodies, recurrent symptoms, crackles, delayed symptom onset, and weight loss.
    • Acute HP mimics influenza with fever and cough; chronic HP presents with weight loss.
    • Immunologically, HP shows CD8(+) lymphocytosis (CD4:CD8 ratio <1) and heightened antigen presentation.

    Conclusions:

    • Accurate diagnosis of HP relies on a combination of clinical, serologic, and exposure history.
    • Understanding the distinct stages and immunologic profile aids in patient management and prognosis.