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Related Experiment Video

Updated: Oct 4, 2025

Multi-modal Pulmonary Imaging: Using Complementary Information from CT and Hyperpolarized 129Xe MRI to Evaluate Lung Structure-Function
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COPD phenotypes by computed tomography and ventilatory response to exercise.

S Rodrigues Sousa1, J Nunes Caldeira1, C Rodrigues1

  • 1Pulmonology Department, Coimbra University Hospital, Coimbra, Portugal.

Pulmonology
|February 5, 2022
PubMed
Summary
This summary is machine-generated.

Computed tomographic (CT) phenotyping in chronic obstructive pulmonary disease (COPD) reveals distinct patterns. Emphysema extent (%LAA) and airway wall thickness (%WA) correlate with exercise ventilatory response, with %LAA being an independent predictor.

Keywords:
Cardiopulmonary exercise testingChronic obstructive pulmonary diseaseComputed tomographic

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Area of Science:

  • Pulmonary Medicine
  • Radiology
  • Exercise Physiology

Background:

  • Computed tomographic (CT) patterns in chronic obstructive pulmonary disease (COPD) define distinct clinical features.
  • Understanding these CT phenotypes aids in personalized treatment approaches by revealing physiological responses during exercise.
  • Previous research highlights the importance of CT-derived variables in understanding COPD's impact on exercise capacity.

Purpose of the Study:

  • To investigate the relationship between CT-defined COPD phenotypes and the ventilatory response during cardiopulmonary exercise testing (CPET).
  • To determine if CT metrics can predict physiological responses during exercise in COPD patients.
  • To explore individualized clinical approaches based on CT phenotyping and exercise response.

Main Methods:

  • COPD patients were classified into four phenotypes based on CT metrics: % low attenuation area (%LAA) and % bronchial wall area (%WA).
  • Ventilatory response during CPET was assessed, focusing on ventilatory equivalents for carbon dioxide (VE/VCO2) and VE/VCO2 slope.
  • Multivariate regression models were used to identify independent predictors of ventilatory response, adjusting for clinical factors.

Main Results:

  • Eighty COPD patients (mean age 65 years) were analyzed, with phenotypes including normal, air dominant, emphysema dominant, and mixed.
  • Emphysema dominant and mixed phenotypes exhibited higher VE/VCO2 and VE/VCO2 slope.
  • %LAA and %WA showed significant positive correlations with both VE/VCO2 and VE/VCO2 slope.
  • %LAA emerged as the sole independent predictor for VE/VCO2 and VE/VCO2 slope after adjusting for covariates.

Conclusions:

  • CT-derived emphysema (%LAA) and airway metrics (%WA) are strongly associated with exercise ventilatory response characteristics in mild to moderate COPD.
  • Specifically, %LAA is a crucial independent predictor of ventilatory response during exercise.
  • CT phenotyping holds potential for predicting exercise ventilatory responses in COPD patients, facilitating tailored management strategies.