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Related Concept Videos

Asthma: Pathogenesis and Management01:20

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Asthma is a chronic pulmonary condition involving inflammation of the airways, hyper-reactivity, and reversible obstruction of the airways. This condition can significantly impact a person's quality of life, making breathing difficult and leading to distressing symptoms.
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Asthma-I: Introduction01:29

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Asthma is a chronic respiratory ailment that requires careful management due to its varying symptoms and influencing factors. It is characterized by airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing. The symptom frequency and intensity may vary considerably over time. It is also linked to immune system responses to allergens and irritants, highlighting the complex...
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Asthma-II: Pathophysiology and Classification01:26

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Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
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Asthma-IV: Diagnostic and Management01:30

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Chronic obstructive pulmonary isease (COPD) involves a group of progressive lung disorders characterized by persistent airflow limitation and chronic respiratory symptoms. Asthma-COPD Overlap Syndrome (ACOS), encompassing features of both asthma and Chronic obstructive pulmonary disease (COPD), is a group of progressive lung disorders that includes chronic bronchitis, emphysema, and refractory (non-reversible) asthma. ACOS leads to complex clinical presentations that combine the inflammatory...
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COPD is defined as a heterogeneous lung condition marked by persistent respiratory symptoms such as dyspnea, cough, and sputum production, caused by abnormalities in the airways that cause airflow obstruction.
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Occupational Asthma Without Nonspecific Bronchial Hyperresponsiveness.

Virginie Doyen1, Julien Godet2, Jolanta Walusiak-Skorupa3

  • 1Service de Pneumologie, Centre Hospitalier Universitaire UCL Namur, Université Catholique de Louvain, Yvoir, Belgium.

The Journal of Allergy and Clinical Immunology. in Practice
|March 11, 2026
PubMed
Summary
This summary is machine-generated.

The absence of nonspecific bronchial hyperresponsiveness (NSBH) does not rule out occupational asthma (OA) in quiescent cases. However, a negative NSBH test is highly reliable for diagnosing OA in patients with active disease.

Keywords:
Airway hyperresponsivenessFractional exhaled nitric oxideOccupational asthmaSpecific inhalation challengeSputum eosinophils

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Area of Science:

  • Occupational Medicine
  • Pulmonology
  • Allergy and Immunology

Background:

  • Nonspecific bronchial hyperresponsiveness (NSBH) is absent in a significant portion of occupational asthma (OA) patients.
  • Investigating the characteristics of OA patients without baseline NSBH is crucial.

Purpose of the Study:

  • To examine clinical and inflammatory features linked to the absence of baseline NSBH in OA patients identified by specific inhalation challenge (SIC).

Main Methods:

  • Retrospective analysis of 1068 subjects undergoing SIC for occupational agents.
  • Evaluation of baseline and post-challenge NSBH, fractional exhaled nitric oxide, and sputum eosinophils.

Main Results:

  • Among 377 positive SIC subjects, 63 (16.7%) lacked baseline NSBH; 45 developed it post-challenge.
  • Quiescent asthma (untreated, no obstruction) was linked to undetectable baseline NSBH (OR 3.59).
  • Baseline NSBH assessment showed lower sensitivity and NPV in quiescent asthma compared to active disease.

Conclusions:

  • Absence of NSBH does not exclude OA in quiescent asthma, requiring further investigation.
  • A negative NSBH test has a high negative predictive value for OA in active disease patients.