Assessment of gas compression and lung volume during air stacking maneuver
Purpose We reasoned that the application of positive pressure through air stacking (AS) technique could cause gas compression and the absolute lung volumes could be estimated. The aim of this study was to estimate the amount of gas compression (ΔVcomp) during AS in healthy subjects positioned at 45° trunk inclination and verify if the simultaneous measurements of chest wall volume changes (ΔVCW), by optoelectronic plethysmography, and changes in lung volume (ΔVao), by pneumotachograph, combined with pressure variation at the airways opening (ΔPao) during AS are able to provide reliable data on absolute lung volumes. Methods Twenty healthy subjects (mean age 23.5 ± 3.8 years) were studied during a protocol that included slow vital capacity and AS maneuvers. Vcomp was calculated by subtracting ΔVao and ΔVCW occurring during AS and total lung capacity (TLC) was estimated by applying Boyle–Mariote’s law using Vcomp and ΔPao. Results During AS, 0.140 ± 0.050 L of gas was compressed with an average ΔPao of 21.78 ± 6.18 $ cmH_{2} $O. No significant differences between the estimated TLC (−0.03 ± 3.0% difference, p = 0.6020), estimated FRC (−2.0 ± 12.4% difference, p = 0.5172), measured IC (1.2 ± 11.2% difference, p = 0.7627) and predicted values were found. Conclusion During AS, a significant gas compression occurs and absolute lung volumes can be estimated by simultaneous measurements of ΔVCW, ΔVao and ΔPao..
| Medienart: |
Artikel |
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| Erscheinungsjahr: |
2016 |
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| Erschienen: |
2016 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:117 |
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| Enthalten in: |
European journal of applied physiology - 117(2016), 1 vom: 09. Dez., Seite 189-199 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Sarmento, A. [VerfasserIn] |
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| Links: |
Volltext [lizenzpflichtig] |
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| Themen: |
Absolute lung volumes |
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| Anmerkungen: |
© Springer-Verlag Berlin Heidelberg 2016 |
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| doi: |
10.1007/s00421-016-3511-y |
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| PPN (Katalog-ID): |
OLC2043788272 |
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| 245 | 1 | 0 | |a Assessment of gas compression and lung volume during air stacking maneuver |
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| 500 | |a © Springer-Verlag Berlin Heidelberg 2016 | ||
| 520 | |a Purpose We reasoned that the application of positive pressure through air stacking (AS) technique could cause gas compression and the absolute lung volumes could be estimated. The aim of this study was to estimate the amount of gas compression (ΔVcomp) during AS in healthy subjects positioned at 45° trunk inclination and verify if the simultaneous measurements of chest wall volume changes (ΔVCW), by optoelectronic plethysmography, and changes in lung volume (ΔVao), by pneumotachograph, combined with pressure variation at the airways opening (ΔPao) during AS are able to provide reliable data on absolute lung volumes. Methods Twenty healthy subjects (mean age 23.5 ± 3.8 years) were studied during a protocol that included slow vital capacity and AS maneuvers. Vcomp was calculated by subtracting ΔVao and ΔVCW occurring during AS and total lung capacity (TLC) was estimated by applying Boyle–Mariote’s law using Vcomp and ΔPao. Results During AS, 0.140 ± 0.050 L of gas was compressed with an average ΔPao of 21.78 ± 6.18 $ cmH_{2} $O. No significant differences between the estimated TLC (−0.03 ± 3.0% difference, p = 0.6020), estimated FRC (−2.0 ± 12.4% difference, p = 0.5172), measured IC (1.2 ± 11.2% difference, p = 0.7627) and predicted values were found. Conclusion During AS, a significant gas compression occurs and absolute lung volumes can be estimated by simultaneous measurements of ΔVCW, ΔVao and ΔPao. | ||
| 650 | 4 | |a Absolute lung volumes | |
| 650 | 4 | |a Air stacking | |
| 650 | 4 | |a Boyle–Mariote’s law | |
| 650 | 4 | |a Gas compression | |
| 650 | 4 | |a Optoelectronic plethysmography | |
| 700 | 1 | |a Resqueti, V. R. |4 aut | |
| 700 | 1 | |a Fregonezi, G. A. F. |4 aut | |
| 700 | 1 | |a Aliverti, A. |4 aut | |
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