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Related Concept Videos

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
COPD: Pathogenesis and Clinical Features01:20

COPD: Pathogenesis and Clinical Features

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...
Chronic Obstructive Pulmonary Disease IV: Clinical Manifestations01:19

Chronic Obstructive Pulmonary Disease IV: Clinical Manifestations

Chronic Obstructive Pulmonary Disease, or COPD, is a long-term condition marked by persistent and only partially reversible airflow limitation. It involves two overlapping conditions—chronic bronchitis and emphysema—which often co-appear but differ in dominant symptoms and underlying mechanisms.Chronic Bronchitis FeaturesChronic bronchitis presents with a persistent productive cough and thick, sometimes purulent mucus due to airway inflammation, enlarged mucus glands, and goblet cell...
Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies01:27

Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies

Assessing and diagnosing Chronic Obstructive Pulmonary Disease (COPD) involves a detailed approach that includes a comprehensive review of medical history, physical examination, and a variety of diagnostic tests. This thorough evaluation is essential to ensure an accurate diagnosis and guide effective management strategies.
Medical History
Chronic Obstructive Pulmonary Disease01:24

Chronic Obstructive Pulmonary Disease

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.
Smoking is a primary risk factor for COPD, with over 80% of patients having a history of it. Patients typically experience progressive dyspnea or labored breathing, frequent coughing, and recurrent pulmonary infections. Many eventually succumb to respiratory failure, characterized by...
Chronic Obstructive Pulmonary Disease-I: Introduction01:20

Chronic Obstructive Pulmonary Disease-I: Introduction

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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Machine Learning-Based Cough Tone Classification: Diagnostic Exploration of Chronic Obstructive Pulmonary Disease and Respiratory Tract Infections
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Machine Learning-Based Cough Tone Classification: Diagnostic Exploration of Chronic Obstructive Pulmonary Disease and Respiratory Tract Infections

Published on: September 19, 2025

COPD phenotype description using principal components analysis.

Kay Roy1, Jacky Smith, Umme Kolsum

  • 1University of Manchester, North West Lung Research Centre, University Hospital of South Manchester Foundation Trust, Manchester, UK. keyaroy2003@yahoo.co.uk

Respiratory Research
|June 2, 2009
PubMed
Summary
This summary is machine-generated.

Chronic obstructive pulmonary disease (COPD) is complex. Biomarkers reveal distinct inflammatory pathways, including neutrophilic airway inflammation linked to systemic inflammation and eosinophils related to fractional exhaled nitric oxide (FeNO).

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Area of Science:

  • Pulmonary Medicine
  • Immunology
  • Biostatistics

Background:

  • Chronic obstructive pulmonary disease (COPD) exhibits airway inflammation measurable by induced sputum and fractional exhaled nitric oxide (FeNO).
  • Understanding COPD heterogeneity is crucial for targeted therapies.
  • Biomarkers offer insights into disease complexity.

Purpose of the Study:

  • To explore COPD heterogeneity using principal components analysis (PCA).
  • To analyze airway and systemic inflammation biomarkers alongside pulmonary function.
  • To identify distinct patient clusters within COPD.

Main Methods:

  • 127 COPD patients (mean FEV1 61%) underwent pulmonary function tests.
  • Measurements included FeNO, plasma C-reactive protein (CRP), TNF-alpha, sputum differential cell counts, and IL8.
  • Principal components analysis and multivariate analyses were performed.

Main Results:

  • PCA identified four components: (1) sputum neutrophils, IL8, and plasma TNF-alpha (20.2%); (2) sputum eosinophils and FeNO (18.2%); (3) bronchodilator reversibility, FEV1, and inspiratory capacity (IC) (15.1%); (4) CRP (11.4%).
  • Multivariate analyses confirmed strong associations within components 1 and 2.
  • These components represent distinct inflammatory and functional profiles.

Conclusions:

  • COPD is a multi-dimensional disease with identifiable, distinct components.
  • Neutrophilic airway inflammation is associated with systemic inflammation.
  • Sputum eosinophils correlate with elevated FeNO, indicating separate inflammatory pathways.
  • A dissociation exists between airway inflammation and lung function in COPD patients.