Effects of age, smoking, and posture on respiratory functions
Masuda, R.
Masui. Japanese Journal of Anesthesiology 36(5): 680-693
1987
ISSN/ISBN: 0021-4892 PMID: 3656638 Document Number: 294522
The respiratory functions in smokers and non-smokers under both supine and sitting positions were studied. Spirometory measurements were done in 120 volunteers who had no histories of respiratory disease, and subdivisions of the lung volume, closing volume, and diffusing capacity were measured in 52 volunteers out of 120. Each volunteer was divided into two groups of smokers and non-smokers, and also divided according to ages into each decade. Respiratory functions were studied in sitting and supine positions. The results are the followings; 1) in spirometory measurements: %VC and V25-HT decreased with aging, that was emphasized in supine position and in smokers. Smoking effect was significant in .ovrhdot.V/25/HT, but FEV1.0% was not influenced by any factors such as smoking, aging, and position. According to the decrease of %VC with aging, standard value of %VC should be reexamined among Japanese people. 2) In subdivisions of the lung volume : FRC/TLC decreased by changing position from sitting to supine significantly, and it was emphasized with smoking. 3) Closing volume: CV and .DELTA.N2 increased obviously with aging, but they were varied among individuals. This tendency increased in supine position and smokers. 4). Diffusing capacity decreased in smokers and aged people and increased in supine position, but not significantly. .ovrhdot.V25/HT was correlated well the changes of CV/VC and .DELTA.N2. This indicates that .ovrhdot.V23 HT is a good parameter of impaired gas exchange in preoperative respiratory function tests.