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Lung function and respiratory symptoms in association with mortality: The HUNT Study
Linda Leivseth1, Tom Ivar Lund Nilsen, Xiao-Mei Mai
11Department of Public Health and General Practice, Norwegian University of Science and Technology (NTNU) , Trondheim , Norway.
COPD
|July 24, 2013
Summary
Poor lung function significantly increases mortality risk. However, breathlessness during exertion also independently predicts a higher risk of death, even with normal lung function.
Area of Science:
- Respiratory Medicine
- Epidemiology
- Public Health
Background:
- Lung function and respiratory symptoms are key indicators of respiratory health.
- Their independent associations with mortality require clarification.
Purpose of the Study:
- To investigate the associations of lung function and respiratory symptoms with all-cause and cardiovascular mortality.
- To determine if respiratory symptoms predict mortality independently of lung function.
Main Methods:
- Utilized data from 10,491 adults in the Nord-Trøndelag Health Study (HUNT) Lung Study (1995-2009).
- Employed Cox regression to analyze associations between lung function (ppFEV1, COPD grades) and respiratory symptoms (dyspnoea, wheeze, chronic bronchitis) with mortality outcomes.
- Adjusted for potential confounders.
Main Results:
- Reduced lung function (ppFEV1 <50, COPD grade 3-4) was strongly associated with increased all-cause mortality in both sexes.
- Dyspnoea when walking was associated with increased all-cause mortality, independent of lung function.
- Associations with cardiovascular mortality were weaker, and other respiratory symptoms were not significantly associated with mortality.
Conclusions:
- Lung function is a significant predictor of all-cause and cardiovascular mortality.
- Dyspnoea when walking represents an independent risk factor for all-cause mortality, highlighting its clinical significance beyond lung function measures.
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