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Predictors of Clinical Stability and Mortality in COPD: A Longitudinal Study
Wesley Teck Wee Loo1, Si Yuan Chew1, Jessica Han Ying Tan2
1Department of Respiratory and Critical Care Medicine, Singapore General Hospital, Singapore.
Summary
Predictors of clinical stability in chronic obstructive pulmonary disease (COPD) were identified, but stability did not predict mortality. Cardiovascular disease (CVD) presence, however, significantly impacted long-term survival in COPD patients.
Area of Science:
- Pulmonary Medicine
- Cardiovascular Medicine
- Epidemiology
Background:
- Clinical stability lacks a consensus definition in chronic obstructive pulmonary disease (COPD).
- It is less frequently targeted in COPD treatment compared to severe asthma.
- Factors influencing COPD clinical stability and their impact on mortality remain understudied.
Purpose of the Study:
- To identify predictors of two-year clinical stability in COPD patients.
- To assess the impact of comorbid cardiovascular disease (CVD) on clinical stability and mortality.
Main Methods:
- Prospective longitudinal cohort study.
- Inclusion of 463 COPD patients (mean age 71 ± 9 years).
- Assessment of clinical stability (no exacerbations, stable CAT score) and comorbid CVD over two years.
Main Results:
- 36% achieved stability at one year, one-third at two years.
- Predictors of 2-year stability: higher BMI, FEV1/FVC ratio, fewer baseline exacerbations, absence of bronchiectasis, preserved hemoglobin, and smoking cessation.
- 2-year clinical stability did not predict mortality, but CVD presence predicted 5-year mortality (HR 1.48).
Conclusions:
- Identified predictors for 2-year clinical stability in COPD.
- Clinical stability and mortality appear to be distinct outcomes driven by different factors.
- Comprehensive COPD management requires addressing comorbidities like CVD for improved survival.
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