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Severe asthma in adults.

Sally Wenzel1

  • 1National Jewish Medical and Research Center, 1400 Jackson Street, Denver, CO 80206, USA. wenzels@njc.org

American Journal of Respiratory and Critical Care Medicine
|April 26, 2005
PubMed
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Severe asthma is a complex, heterogeneous disease with poorly understood causes. Identifying distinct phenotypes, like early-onset allergic asthma versus late-onset, is key to improving treatment strategies.

Area of Science:

  • Pulmonology
  • Immunology
  • Genetics

Background:

  • Severe asthma is a heterogeneous condition, leading to challenges in understanding and treatment.
  • Patients with severe asthma consume significant healthcare resources.
  • The underlying genetic and environmental factors contributing to severe asthma are not well understood.

Purpose of the Study:

  • To explore the heterogeneity of severe asthma.
  • To define distinct phenotypes of severe asthma based on age of onset and inflammation.
  • To understand the implications of these phenotypes for treatment.

Main Methods:

  • Phenotyping severe asthma based on age at onset (early vs. late).
  • Analyzing immunologic, physiologic, epidemiologic, and pathologic differences between phenotypes.

Related Experiment Videos

  • Investigating the role of inflammation, including eosinophilia and steroid resistance.

    • Main Results:

    • Early-onset severe asthma is more strongly associated with allergic mechanisms than late-onset.
    • Severe asthma can be categorized by inflammation type; persistent eosinophilia correlates with higher symptom burden and near-fatal events.
    • A significant proportion of severe asthma patients (at least 50%) show minimal identifiable inflammation, suggesting complex steroid resistance mechanisms.

    Conclusions:

    • Recognizing distinct severe asthma phenotypes, such as early-onset allergic and late-onset, is crucial for advancing patient care.
    • Understanding the diverse inflammatory profiles and steroid resistance patterns is essential for developing targeted therapies.
    • Further research into severe asthma phenotypes will guide the development of more effective treatment strategies beyond corticosteroids.