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[Follow-up study of lung function changes for 10 years in healthy elder of ex-smokers]
Objective:
To observe changes of lung function for 10 years in healthy elderly ex-smokers who have quitted smoking for more than 10 years.
Methods:
51 healthy elderly ex-smokers were selected and routine lung function tests were performed, 12 subjects, who have never smoked and all other criteria were similar, were chosen as controls. Their routine lung function tests have also been followed up for 10 years.
Results:
The decrease of VC, FVC, FEV1 and PEF of ex-smokers were significantly lower than non-smokers, the increase of RV and RV/TLC were significantly higher than non-smokers. FEV1/FVC, MVV, MMEF, FRC and TLC were also different, however, the difference has not reached statistically significant.
Conclusions:
The influence of smoking could be prolonged, even the subject has stopped smoking for years, so we suggested to stop smoking the early the better.