Comparison of inspiratory and expiratory lung and lobe volumes among supine, standing, and sitting positions using conventional and upright CT

Currently, no clinical studies have compared the inspiratory and expiratory volumes of unilateral lung or of each lobe among supine, standing, and sitting positions. In this prospective study, 100 asymptomatic volunteers underwent both low-radiation-dose conventional (supine position, with arms rais...

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Bibliographic Details
Published in:Scientific reports 2020-10, Vol.10 (1), p.16203-16203, Article 16203
Main Authors: Yamada, Yoshitake, Yamada, Minoru, Chubachi, Shotaro, Yokoyama, Yoichi, Matsuoka, Shiho, Tanabe, Akiko, Niijima, Yuki, Murata, Mitsuru, Fukunaga, Koichi, Jinzaki, Masahiro
Format: Article
Language:English
Subjects:
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692/698
692/700/1421
Adult
Aged
Asymptomatic
Computed tomography
Drug dosages
Exhalation
Female
Functional Residual Capacity - physiology
Humanities and Social Sciences
Humans
Infectious diseases
Laboratories
Lung - diagnostic imaging
Lung - physiology
Lung cancer
Lung Volume Measurements
Male
Medicine
Middle Aged
multidisciplinary
Pandemics
Prospective Studies
Radiation
Respiration
Respiratory function
Respiratory Function Tests
Science
Science (multidisciplinary)
Sensors
Sitting Position
Standing Position
Supine Position
Tomography
Tomography, X-Ray Computed - methods
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Summary:Currently, no clinical studies have compared the inspiratory and expiratory volumes of unilateral lung or of each lobe among supine, standing, and sitting positions. In this prospective study, 100 asymptomatic volunteers underwent both low-radiation-dose conventional (supine position, with arms raised) and upright computed tomography (CT) (standing and sitting positions, with arms down) during inspiration and expiration breath-holds and pulmonary function test (PFT) on the same day. We compared the inspiratory/expiratory lung/lobe volumes on CT in the three positions. The inspiratory and expiratory bilateral upper and lower lobe and lung volumes were significantly higher in the standing/sitting positions than in the supine position (5.3–14.7% increases, all P  0.15); the expiratory right middle lobe volume was significantly lower in the standing/sitting positions (16.3/14.1% decrease) than in the supine position (both P 
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-73240-8