Predictors of mortality in patients with stable COPD

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Cristóbal Esteban1, José M Quintana, Myriam Aburto

  • 1Pneumology Department, Galdakao, Bizkaia, Spain. cristobal_esteban@yahoo.es

Journal of General Internal Medicine
|September 17, 2008
PubMed

Insights

In stable COPD patients, FEV(1%) predicts respiratory mortality and dyspnea predicts all-cause mortality. Health-related quality of life (HRQoL) generally does not predict mortality when dyspnea is considered.

Area of Science:

  • Pulmonology
  • Clinical Epidemiology
  • Respiratory Medicine

Background:

  • Stable Chronic Obstructive Pulmonary Disease (COPD) poses a significant mortality risk.
  • Identifying key predictors of mortality in stable COPD is crucial for patient management.
  • The role of health-related quality of life (HRQoL) in COPD mortality requires further elucidation.

Purpose of the Study:

  • To identify easily accessible clinical factors associated with mortality in stable COPD patients.
  • To determine if HRQoL provides additional predictive information for mortality beyond established clinical factors.

Main Methods:

  • A five-year prospective cohort study involving 600 stable COPD patients from five outpatient clinics.
  • Data collected included age, FEV(1%), dyspnea, prior hospitalizations/ER visits for COPD, smoking history, comorbidities, BMI, and HRQoL (SGRQ, CRQ, SF-36).
  • Logistic and Cox regression models were employed to analyze the association between variables and mortality.

Main Results:

  • FEV(1%), dyspnea, age, previous COPD hospitalizations, and pack-years of smoking were independent predictors of respiratory mortality.
  • These factors, particularly dyspnea, were also independently associated with all-cause mortality.
  • HRQoL was not a significant independent predictor of mortality when dyspnea was included in the models, with some exceptions for SGRQ scores.

Conclusions:

  • FEV(1%) is the primary predictor of respiratory mortality, while dyspnea is the strongest predictor of all-cause mortality in stable COPD.
  • HRQoL generally does not add significant predictive value for mortality in stable COPD when dyspnea is accounted for.
  • The predictive performance of CRQ and SGRQ for mortality was similar in this patient cohort.
Abstract

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