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Related Concept Videos

COPD: Pathogenesis and Clinical Features01:20

COPD: Pathogenesis and Clinical Features

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Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...
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Chronic Obstructive Pulmonary Disease01:22

Chronic Obstructive Pulmonary Disease

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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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Chronic Obstructive Pulmonary Disease-I: Introduction01:20

Chronic Obstructive Pulmonary Disease-I: Introduction

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Chronic Obstructive Pulmonary Disease (COPD) is a long-lasting respiratory condition requiring continuous attention and care. It is a progressive lung disease that leads to breathing challenges due to airflow obstruction. It manifests as persistent respiratory symptoms and restricted airflow resulting from abnormalities in the airways and alveoli, usually due to long-term exposure to harmful particles or gases. COPD mainly consists of two primary conditions: emphysema and chronic bronchitis.
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Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

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Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
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Chronic Obstructive Pulmonary Disease-III: Symptoms and Complications.01:25

Chronic Obstructive Pulmonary Disease-III: Symptoms and Complications.

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Understanding the variety of primary symptoms and systemic complications that characterize chronic obstructive pulmonary disease (COPD) is crucial for healthcare professionals.
Symptoms of COPD can be classified as primary or systemic. Primary symptoms relate to reduced airflow, while systemic or extrapulmonary symptoms relate to COPD's broader impact on the body.
Primary Symptoms of COPD:
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COPD: Management Using Bronchodilators and Corticosteroids01:26

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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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Related Experiment Video

Updated: Nov 14, 2025

Generation of a Chronic Obstructive Pulmonary Disease Model in Mice by Repeated Ozone Exposure
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The different phenotypes of COPD.

Ahmed Yousuf1, Hamish McAuley1, Omer Elneima1

  • 1NIHR Leicester Biomedical Research Centre, Institute for Lung Health, Department of Respiratory Sciences, University of Leicester, University Road, Leicester, United Kingdom.

British Medical Bulletin
|March 11, 2021
PubMed
Summary
This summary is machine-generated.

Identifying clinical phenotypes in chronic obstructive pulmonary disease (COPD) is crucial for personalized treatment. Patients with higher blood eosinophil counts show better response to steroid therapy, but a universal cut-off is debated.

Keywords:
COPDCRPPCTacute exacerbationeosinophilsphenotype

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Area of Science:

  • Pulmonology
  • Clinical Medicine
  • Respiratory Research

Background:

  • Chronic obstructive pulmonary disease (COPD) significantly impacts patient morbidity and mortality.
  • Identifying distinct clinical phenotypes is essential for improving health status and reducing symptom burden in COPD patients.

Purpose of the Study:

  • To review the different clinical phenotypes of COPD.
  • To discuss the role of blood eosinophil counts in predicting treatment response.

Main Methods:

  • Literature search using keywords (COPD, phenotype, acute exacerbation) in PubMed and Google Scholar.
  • Review of existing studies on COPD phenotypes and treatment responses.

Main Results:

  • Patients with elevated blood eosinophil counts demonstrate a better response to steroid therapy during both stable states and exacerbations.
  • A universally accepted blood eosinophil cut-off for predicting corticosteroid or biologic therapy response is currently lacking.

Conclusions:

  • Further research is needed to identify therapeutic options for COPD patients with non-eosinophilic inflammation.
  • Well-designed clinical trials incorporating phenotype identification are crucial for personalizing COPD treatment strategies.