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Longitudinal lung function decline in subjects with respiratory symptoms.
C B Sherman1, X Xu, F E Speizer
1Pulmonary Division, Miriam Hospital, Brown University, Providence, Rhode Island 02906.
The American Review of Respiratory Disease
|October 11, 1992
Summary
Persistent respiratory symptoms like cough and phlegm are linked to reduced lung function and faster decline in forced expiratory volume in 1 second (FEV1). Early awareness can guide interventions to protect lung health.
Area of Science:
- Pulmonology
- Epidemiology
- Respiratory Medicine
Background:
- The relationship between respiratory symptoms and lung function decline is not well-established.
- Longitudinal studies are needed to understand the impact of symptoms on lung function over time.
Purpose of the Study:
- To investigate the association between self-reported respiratory symptoms and the rate of lung function decline.
- To determine the predictive value of symptoms such as wheeze, cough, phlegm, and dyspnea on forced expiratory volume in 1 second (FEV1) decline.
Main Methods:
- Analysis of 12-year longitudinal data from 3,948 adult subjects.
- Standardized respiratory questionnaires and spirometry were used at baseline and follow-up visits.
- Linear regression models were employed to assess the effect of symptoms on lung function.
Main Results:
- Any reported respiratory symptom was associated with lower initial lung function and accelerated decline in height-adjusted FEV1 in both sexes.
- Men reporting cough or phlegm and women reporting cough alone exhibited a faster FEV1 decline after adjusting for covariates.
- These symptoms are significant predictors of lung function loss.
Conclusions:
- Self-reported respiratory symptoms are valuable indicators of reduced lung function and accelerated decline.
- Clinicians should consider these symptoms as potential predictors for therapeutic interventions.
- Early identification and management of respiratory symptoms may help mitigate lung function deterioration.