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Ides KM, De Backer WA, Lanclus M, Leemans G, Dierckx W, Lauwers E, Vissers D, Steckel J, De Backer JW. The effect of posture on airflow distribution, airway geometry and air velocity in healthy subjects. BMC Pulm Med 2022; 22:477. [PMID: 36522658 PMCID: PMC9753395 DOI: 10.1186/s12890-022-02276-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 12/06/2022] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Gravity, and thus body position, can affect the regional distribution of lung ventilation and blood flow. Therefore, body positioning is a potential tool to improve regional ventilation, thereby possibly enhancing the effect of respiratory physiotherapy interventions. In this proof-of-concept study, functional respiratory imaging (FRI) was used to objectively assess effects of body position on regional airflow distribution in the lungs. METHODS Five healthy volunteers were recruited. The participants were asked during FRI first to lie in supine position, afterwards in standardized right lateral position. RESULTS In right lateral position there was significantly more regional ventilation also described as Imaging Airflow Distribution in the right lung than in the left lung (P < 0.001). Air velocity was significantly higher in the left lung (P < 0.05). In right lateral position there was significantly more airflow distribution in the right lung than in the left lung (P < 0.001). Significant changes were observed in airway geometry resulting in a decrease in imaged airway volume (P = 0.024) and a higher imaged airway resistance (P = 0.029) in the dependent lung. In general, the effect of right lateral position caused a significant increase in regional ventilation (P < 0.001) in the dependent lung when compared with the supine position. CONCLUSIONS Changing body position leads to significant changes in regional lung ventilation, objectively assessed by FRI The volume based on the imaging parameters in the dependent lung is smaller in the lateral position than in the supine position. In right lateral decubitus position, airflow distribution is greater in dependent lung compared to the nondependent lung. TRIAL REGISTRATION The trial has been submitted to www. CLINICALTRIALS gov with identification number NCT01893697 on 07/02/2013.
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Affiliation(s)
- Kris M. Ides
- grid.411414.50000 0004 0626 3418Department of Pediatric Medicine, Antwerp University Hospital, drie eikenstraat 655, 2650 Edegem, Belgium ,grid.5284.b0000 0001 0790 3681Laboratory of Experimental Medicine and Pediatrics, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium ,grid.5284.b0000 0001 0790 3681Cosys-Lab, Antwerp University, Flanders Make Lommel, Groenenborgerlaan 171, 2020 Antwerp, Belgium ,Medimprove Multidisciplinairy Private Practice, Groeningenlei 132C, 2550 Kontich, Belgium
| | - Wilfried A. De Backer
- grid.5284.b0000 0001 0790 3681Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium ,Medimprove Multidisciplinairy Private Practice, Groeningenlei 132C, 2550 Kontich, Belgium
| | - Maarten Lanclus
- grid.428659.4FLUIDDA Inc, 228 EAST 45TH Street STE 9E, New York, USA
| | - Glenn Leemans
- grid.5284.b0000 0001 0790 3681Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium
| | - Wendel Dierckx
- grid.5284.b0000 0001 0790 3681Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium ,Medimprove Multidisciplinairy Private Practice, Groeningenlei 132C, 2550 Kontich, Belgium
| | - Eline Lauwers
- grid.476361.1FLUIDDA NV, Groeningenlei 132, 2550 Kontich, Belgium ,grid.411414.50000 0004 0626 3418Department of Pediatric Medicine, Antwerp University Hospital, drie eikenstraat 655, 2650 Edegem, Belgium ,grid.5284.b0000 0001 0790 3681Laboratory of Experimental Medicine and Pediatrics, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium
| | - Dirk Vissers
- grid.5284.b0000 0001 0790 3681Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium
| | - Jan Steckel
- grid.5284.b0000 0001 0790 3681Cosys-Lab, Antwerp University, Flanders Make Lommel, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Jan W. De Backer
- grid.428659.4FLUIDDA Inc, 228 EAST 45TH Street STE 9E, New York, USA
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Lauwers E, Snoeckx A, Ides K, Van Hoorenbeeck K, Lanclus M, De Backer W, De Backer J, Verhulst S. Functional respiratory imaging in relation to classical outcome measures in cystic fibrosis: a cross-sectional study. BMC Pulm Med 2021; 21:256. [PMID: 34348676 PMCID: PMC8336350 DOI: 10.1186/s12890-021-01622-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 07/29/2021] [Indexed: 12/17/2022] Open
Abstract
Background Functional Respiratory Imaging (FRI) combines HRCT scans with computational fluid dynamics to provide objective and quantitative information about lung structure and function. FRI has proven its value in pulmonary diseases such as COPD and asthma, but limited studies have focused on cystic fibrosis (CF). This study aims to investigate the relation of multiple FRI parameters to validated imaging parameters and classical respiratory outcomes in a CF population. Methods CF patients aged > 5 years scheduled for a chest CT were recruited in a cross-sectional study. FRI outcomes included regional airway volume, airway wall volume, airway resistance, lobar volume, air trapping and pulmonary blood distribution. Besides FRI, CT scans were independently evaluated by 2 readers using the CF-CT score. Spirometry and the 6-Minute Walk Test (6MWT) were also performed. Statistical tests included linear mixed-effects models, repeated measures correlations, Pearson and Spearman correlations. Results 39 CT scans of 24 (17M/7F) subjects were analyzed. Patients were 24 ± 9 years old and had a ppFEV1 of 71 ± 25% at the time of the first CT. All FRI parameters showed significant low-to-moderate correlations with the total CF-CT score, except for lobar volume. When considering the relation between FRI parameters and similar CF-CT subscores, significant correlations were found between parameters related to airway volume, air trapping and airway wall thickening. Air trapping, lobar volume after normal expiration and pulmonary blood distribution showed significant associations with all spirometric parameters and oxygen saturation at the end of 6MWT. In addition, air trapping was the only parameter related to the distance covered during 6MWT. A subgroup analysis showed considerably higher correlations in patients with mild lung disease (ppFEV1 ≥ 70%) compared to patients with moderate to severe lung disease (ppFEV1 < 70%) when comparing FRI to CF-CT scores. Conclusions Multiple structural characteristics determined by FRI were associated with abnormalities determined by CF-CT score. Air trapping and pulmonary blood distribution appeared to be the most clinically relevant FRI parameters for CF patients due to their associations with classical outcome measures. The FRI methodology could particularly be of interest for patients with mild lung disease, although this should be confirmed in future research. Supplementary Information The online version contains supplementary material available at 10.1186/s12890-021-01622-3.
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Affiliation(s)
- Eline Lauwers
- Laboratory of Experimental Medicine and Pediatrics, Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2160, Wilrijk, Belgium. .,Infla-Med Research Consortium of Excellence, University of Antwerp, Antwerp, Belgium.
| | - Annemiek Snoeckx
- Department of Radiology, Antwerp University Hospital, Edegem, Belgium.,Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
| | - Kris Ides
- Laboratory of Experimental Medicine and Pediatrics, Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2160, Wilrijk, Belgium.,Infla-Med Research Consortium of Excellence, University of Antwerp, Antwerp, Belgium.,Department of Pediatrics, Antwerp University Hospital, Edegem, Belgium.,CoSys Research Lab, Faculty of Applied Engineering, University of Antwerp, Antwerp, Belgium.,Flanders Make Strategic Research Center, Lommel, Belgium
| | - Kim Van Hoorenbeeck
- Laboratory of Experimental Medicine and Pediatrics, Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2160, Wilrijk, Belgium.,Infla-Med Research Consortium of Excellence, University of Antwerp, Antwerp, Belgium.,Department of Pediatrics, Antwerp University Hospital, Edegem, Belgium
| | | | - Wilfried De Backer
- FLUIDDA NV, Kontich, Belgium.,Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
| | | | - Stijn Verhulst
- Laboratory of Experimental Medicine and Pediatrics, Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2160, Wilrijk, Belgium.,Infla-Med Research Consortium of Excellence, University of Antwerp, Antwerp, Belgium.,Department of Pediatrics, Antwerp University Hospital, Edegem, Belgium
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Tullio M, Aliboni L, Pennati F, Carrinola R, Palleschi A, Aliverti A. Computational fluid dynamics of the airways after left-upper pulmonary lobectomy: A case study. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2021; 37:e3462. [PMID: 33826242 PMCID: PMC8365666 DOI: 10.1002/cnm.3462] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 03/17/2021] [Accepted: 04/04/2021] [Indexed: 06/12/2023]
Abstract
Pulmonary lobectomy is the gold standard intervention for lung cancer removal and consists of the complete resection of the affected lung lobe, which, coupled with the re-adaptation of the remaining thoracic structures, decreases the postoperative pulmonary function of the patient. Current clinical practice, based on spirometry and cardiopulmonary exercise tests, does not consider local changes, providing an average at-the-mouth estimation of residual functionality. Computational Fluid Dynamics (CFD) has proved a valuable solution to obtain quantitative and local information about airways airflow dynamics. A CFD investigation was performed on the airway tree of a left-upper pulmonary lobectomy patient, to quantify the effects of the postoperative alterations. The patient-specific bronchial models were reconstructed from pre- and postoperative CT scans. A parametric laryngeal model was merged to the geometries to account for physiological-like inlet conditions. Numerical simulations were performed in Fluent. The postoperative configuration revealed fluid dynamic variations in terms of global velocity (+23%), wall pressure (+48%), and wall shear stress (+39%). Local flow disturbances emerged at the resection site: a high-velocity peak of 4.92 m/s was found at the left-lower lobe entrance, with a local increase of pressure at the suture zone (18 Pa). The magnitude of pressure and secondary flows increased in the trachea and flow dynamics variations were observed also in the contralateral lung, causing altered lobar ventilation. The results confirmed that CFD is a patient-specific approach for a quantitative evaluation of fluid dynamics parameters and local ventilation providing additional information with respect to current clinical approaches.
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Affiliation(s)
- Marta Tullio
- Dipartimento di ElettronicaInformazione e Bioingegneria, Politecnico di MilanoMilanItaly
| | - Lorenzo Aliboni
- Dipartimento di ElettronicaInformazione e Bioingegneria, Politecnico di MilanoMilanItaly
| | - Francesca Pennati
- Dipartimento di ElettronicaInformazione e Bioingegneria, Politecnico di MilanoMilanItaly
| | - Rosaria Carrinola
- Thoracic Surgery and Lung Transplantation UnitFondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico of MilanMilanItaly
| | - Alessandro Palleschi
- Thoracic Surgery and Lung Transplantation UnitFondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico of MilanMilanItaly
- Department of Pathophysiology and TransplantationUniversity of MilanMilanItaly
| | - Andrea Aliverti
- Dipartimento di ElettronicaInformazione e Bioingegneria, Politecnico di MilanoMilanItaly
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