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Hypersensitivities01:30

Hypersensitivities

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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.
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A pneumothorax is a condition where air builds up in the space between the lung and the chest wall, causing the lung to collapse. This condition arises when air enters the space between the parietal and visceral pleura, disrupting the negative pressure essential for lung inflation. This can lead to a partial or complete collapse of the lung.
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Hypersensitivity pneumonitis.

Ulrich Costabel1, Yasunari Miyazaki2, Annie Pardo3

  • 1Center for Interstitial and Rare Lung Diseases, Pneumology Department, Ruhrlandklinik, University Hospital, University of Essen, Essen, Germany. ulrich.costabel@rlk.uk-essen.de.

Nature Reviews. Disease Primers
|August 9, 2020
PubMed
Summary
This summary is machine-generated.

Hypersensitivity pneumonitis (HP) is an immune response to inhaled environmental antigens like bird proteins and fungi. Treatment focuses on antigen avoidance and managing inflammation with immunosuppressants, with antifibrotics for progressive disease.

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Area of Science:

  • Pulmonary Medicine
  • Immunology
  • Environmental Health

Background:

  • Hypersensitivity pneumonitis (HP) is an immune-mediated lung disease triggered by inhaled environmental antigens, primarily bird proteins and fungi.
  • Its prevalence varies based on exposure intensity, geography, and climate, affecting susceptible individuals.
  • HP involves an exaggerated immune response in the small airways and lung parenchyma.

Purpose of the Study:

  • To describe the immunopathology, classification, and clinical presentation of hypersensitivity pneumonitis.
  • To outline diagnostic criteria and management strategies for HP.
  • To highlight the role of environmental exposures and host factors in HP development.

Main Methods:

  • Diagnosis relies on exposure history, clinical symptoms, high-resolution CT (HRCT) imaging, specific IgG antibodies, bronchoalveolar lavage (BAL), and lung biopsy.
  • Classification includes acute, chronic non-fibrotic, and chronic fibrotic HP based on exposure patterns and disease progression.
  • Identifying and avoiding the causative antigen is crucial for management.

Main Results:

  • HP presents acutely from intermittent high-level exposure or chronically from long-term low-level exposure.
  • Chronic fibrotic HP can progress even after antigen avoidance.
  • Diagnostic findings include characteristic HRCT patterns and specific antibodies.

Conclusions:

  • Complete antigen avoidance is the primary treatment for HP.
  • Corticosteroids are used for chronic HP, and antifibrotic therapy is considered for progressive fibrotic disease.
  • Understanding the interplay of genetic, host, and environmental factors is key to managing HP.