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Quantitative CT-Derived extrapulmonary body composition and the risk of acute exacerbations in COPD: A prospective
Chengyu Miao1, Shengchuan Feng1, Fengyan Wang1
1Guangzhou Institute of Respiratory Health, State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, National Center for Respiratory Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong Province, China.
Chronic obstructive pulmonary disease (COPD) patients with lower muscle mass, bone density, and higher coronary calcification face increased acute exacerbation (AE) risk. Chest CT scans can identify these extrapulmonary markers for better risk assessment.
Area of Science:
- Pulmonary Medicine
- Radiology
- Cardiology
Background:
- Chronic obstructive pulmonary disease (COPD) presents with systemic issues like muscle wasting, osteoporosis, and heart disease.
- The link between extrapulmonary findings on CT scans and acute exacerbation (AE) risk in COPD is not fully understood.
Purpose of the Study:
- To determine if chest CT-derived measures of body composition, bone mineral density (BMD), and coronary artery calcification (CAC) correlate with AE risk and frequency in COPD patients.
Main Methods:
- A prospective observational study included 306 COPD patients and 83 controls.
- Quantitative chest CT assessed pectoralis muscle area (PMA), subcutaneous adipose tissue (SAT), thoracic vertebral BMD, and CAC.
- COPD patients were followed for AE occurrence and frequency over one and two years.
Main Results:
- COPD patients had lower PMA, SAT, and BMD compared to controls (p<0.001).
- AEs within one year were linked to lower BMD (p=0.032).
- Frequent exacerbators showed reduced PMA and altered coronary calcification patterns (p<0.05).
- Over two years, AEs were associated with increased left circumflex and total coronary calcification (p<0.05).
Conclusions:
- CT-derived muscle mass, BMD, and coronary calcification are significant predictors of AE risk and frequency in COPD.
- Extrapulmonary CT markers are clinically relevant for stratifying exacerbation risk in COPD patients.
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