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Related Experiment Video

Updated: Dec 3, 2025

Rapid Viscoelastic Characterization of Airway Mucus Using a Benchtop Rheometer
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Defining Chronic Mucus Hypersecretion Using the CAT in the SPIROMICS Cohort.

Marni Stott-Miller1, Hana Müllerová2, Bruce Miller3

  • 1GSK R&D, Epidemiology: Value, Evidence and Outcomes, Uxbridge, UK.

International Journal of Chronic Obstructive Pulmonary Disease
|October 29, 2020
PubMed
Summary

The COPD Assessment Test (CAT) effectively identifies chronic mucus hypersecretion (CMH) in COPD patients, correlating with exacerbation frequency. This simple tool aids in identifying key COPD traits for clinical trials and telemedicine.

Keywords:
CATCOPDSGRQcoughexacerbationphlegm

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Area of Science:

  • Pulmonology
  • Respiratory Medicine
  • Clinical Trials

Background:

  • Chronic obstructive pulmonary disease (COPD) frequently involves chronic cough and phlegm.
  • Chronic mucus hypersecretion (CMH) is traditionally defined by symptom duration (≥3 months) or chronic bronchitis (CB) criteria.
  • Existing definitions lack a simple, routine clinical assessment tool.

Purpose of the Study:

  • To evaluate if the COPD Assessment Test (CAT) can identify chronic mucus hypersecretion (CMH) populations and outcomes.
  • To compare CAT-based CMH identification with established Medical Research Council (MRC) and St. George's Respiratory Questionnaire (SGRQ) definitions.
  • To assess the correlation between CMH definitions and exacerbation frequency in COPD patients.

Main Methods:

  • Identified CMH in the SPIROMICS COPD cohort using MRC, SGRQ, and CAT definitions.
  • Determined optimal cut-points for CAT cough and phlegm items.
  • Analyzed exacerbation frequencies (moderate and severe) over 3 years, stratified by smoking status.

Main Results:

  • 49% of participants had CAT-defined CMH, comparable to SGRQ-defined CMH (47%).
  • An optimal CAT cut-point of ≥2 for cough and phlegm items identified CMH.
  • CMH presence, regardless of definition, correlated with higher exacerbation frequencies over 3 years.

Conclusions:

  • The CAT effectively identifies SGRQ-defined CMH, a significant COPD trait linked to exacerbations.
  • CAT-based CMH identification offers a simple, valuable approach for clinical settings, telemedicine, and trials.
  • The CAT provides a novel method for characterizing COPD patients in real-world and remote settings.