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A narrative review of electrical impedance tomography in lung diseases with flow limitation and hyperinflation: methodologies and applications

Ling Sang, Zhanqi Zhao, Zhimin Lin, Xiaoqing Liu, Nanshan Zhong, Yimin Li
2020 Annals of Translational Medicine  
PubMed was searched up to May 2020 to identify studies investigating the use of EIT in patients with asthma, bronchiectasis, bronchitis, bronchiolitis, chronic obstructive pulmonary disease, and cystic  ...  The aim of the present review was to summarize the current literature concerning the methodologies and applications of EIT in lung diseases with flow limitation and hyperinflation.  ...  (top row) and a patient with chronic obstructive pulmonary disease (COPD) (bottom row).  ... 
doi:10.21037/atm-20-4984 pmid:33490200 pmcid:PMC7812189 fatcat:7lpobj6utvbivgr6kj2wwltvgu

Determination of regional lung function in cystic fibrosis using electrical impedance tomography

Sabine Krueger-Ziolek, Benjamin Schullcke, Zhanqi Zhao, Bo Gong, Knut Moeller
2016 Current Directions in Biomedical Engineering  
Due to its relatively high temporal resolution, EIT has already been applied during lung function tests in spontaneously breathing subjects with obstructive lung diseases like chronic obstructive pulmonary  ...  AbstractElectrical impedance tomography (EIT) can be used to monitor regional lung ventilation.  ...  A slightly modified version of the inhomogeneity index (GI) introduced by Zhao et al. in 2009 [11] , was applied to evaluate the distribution of FEV 1 /FVC within the predefined lung regions (see eq.  ... 
doi:10.1515/cdbme-2016-0139 fatcat:cryjwsbakzbljfy5p6bopi5meq

Regional lung function determined by electrical impedance tomography during bronchodilator reversibility testing in patients with asthma

I Frerichs, Z Zhao, T Becher, P Zabel, N Weiler, B Vogt
2016 Physiological Measurement  
Acknowledgments We acknowledge the support by the European Union 7th Framework Programme on R&D (WELCOME project, Grant no. 611223).  ...  The ratios of FEV 1 and FVC were determined in all image pixels and the average value was calculated. The heterogeneity of the spatial FEV 1 /FVC distribution was also evaluated using the GI index.  ...  The degree of ventilation inhomogeneity regarding its spatial and temporal distribution in the lungs might provide valuable information on the functional effects of disease-related lung tissue damage.  ... 
doi:10.1088/0967-3334/37/6/698 pmid:27203725 fatcat:hvlv5xeckjhgbf22bv5t7yvuqe

Global and regional degree of obstruction determined by electrical impedance tomography in patients with obstructive ventilatory defect

Chao Zhang, Meng Dai, Wei Liu, Xiaohui Bai, Jiaming Wu, Canhua Xu, Junying Xia, Feng Fu, Xuetao Shi, Xiuzhen Dong, Faguang Jin, Fusheng You (+1 others)
2018 PLoS ONE  
The purpose of this study was to examine whether EIT was capable of evaluating the degree of obstructive ventilatory defect (OVD) on the global and regional level.  ...  Electrical impedance tomography is a continuous imaging method capable of measuring lung volume changes.  ...  The results of these studies showed the potential of EIT to monitor the inhomogeneity of ventilation distribution in patients with obstructive lung diseases, while the degree of obstruction was not discussed  ... 
doi:10.1371/journal.pone.0209473 pmid:30571739 pmcid:PMC6301672 fatcat:foprqivzazfyleiw3czux546am

Regional ventilation in cystic fibrosis measured by electrical impedance tomography

Zhanqi Zhao, Rainald Fischer, Inéz Frerichs, Ullrich Müller-Lisse, Knut Möller
2012 Journal of Cystic Fibrosis  
The global inhomogeneity (GI) index was applied to assess the degree of ventilation homogeneity at different levels of maximum inspiratory volume.  ...  Regional airway obstruction was identified in the MEF 25 /MEF 75 maps in CF patients.  ...  Due to chronic airway obstruction in CF patients, it may take longer for air to distribute within their lungs.  ... 
doi:10.1016/j.jcf.2012.03.011 pmid:22658424 fatcat:ydsfwlahizeftjpifel4lohtji

Does the nitrogen single-breath washout test contribute to detecting pulmonary involvement in rheumatoid arthritis? A pilot study

Elizabeth Jauhar Cardoso Bessa, Felipe de Miranda Carbonieri Ribeiro, Geraldo da Rocha Castelar Pinheiro, Agnaldo José Lopes
2019 BMC Research Notes  
In patients with RA and airway disease on CT, the N2SBW test detects inhomogeneity in the ventilation distribution in approximately half of the cases, even in those with normal conventional PFT results  ...  Therefore, this study evaluated the contribution of the N2SBW test to the detection of pulmonary involvement in patients with rheumatoid arthritis (RA).  ...  In recent years, there has been growing interest in the study of SAD through measures of ventilation distribution inhomogeneity.  ... 
doi:10.1186/s13104-019-4767-1 pmid:31699130 pmcid:PMC6836485 fatcat:y4xbshdewjf2jbf7ewlreu55km

Regional ventilation distribution in healthy lungs: can reference values be established for electrical impedance tomography parameters?

Lin Yang, Meng Dai, Xinsheng Cao, Knut Möller, Mantas Dargvainis, Inéz Frerichs, Tobias Becher, Feng Fu, Zhanqi Zhao
2021 Annals of Translational Medicine  
Commonly used EIT-based parameters, including the center of ventilation (CoV), dorsal and most dorsal fractions of ventilation distribution (TVD and TVROI4 respectively), global inhomogeneity (GI) index  ...  Although electrical impedance tomography (EIT) is widely used for monitoring regional ventilation distribution, reference values have yet to be established for clinical use.  ...  of chronic obstructive pulmonary disease under mechanical ventilation (8, 9) , as well as pulmonary function testing for patients with asthma, cystic fibrosis, and chronic obstructive pulmonary disease  ... 
doi:10.21037/atm-20-7442 pmid:34268402 pmcid:PMC8246208 fatcat:culjm6gcjzakrcbav2zuxndgmy

Ga‐68 EDTA aerosols in evaluation of inhaled‐particle deposition and clearance of obstructive pulmonary diseases: A pilot prospective study compared with Galligas

Shao‐Ting Wang, Cheng Bao, Qingxing Liu, Tengyue Zhang, Yanli Yang, Xinlun Tian, Zhaohui Zhu, Kai‐Feng Xu
2021 European Journal of Clinical Investigation  
Nonsmoking healthy volunteers, healthy smokers, asthma patients and patients with chronic obstructive pulmonary disease (COPD) were recruited to undergo the dynamic lung ventilation positron emission tomography  ...  Ventilation inhomogeneity was more evident when using Ga-68 EDTA aerosols, especially in patients with COPD and asthma patients.  ...  ACKNOWLEDGEMENT We thank Professor Li Wang from the Institute of Basic Medicine, Chinese Academy of Medical Sciences, for advice of the statistical analysis.  ... 
doi:10.1111/eci.13620 pmid:34076256 pmcid:PMC9286628 fatcat:gtg6mxc53bgtjpage7cgnalxkm

Double tracer gas single-breath washout: reproducibility in healthy subjects and COPD

K. Husemann, N. Berg, J. Engel, J. Port, C. Joppek, Z. Tao, F. Singer, H. Schulz, M. Kohlhaufl
2014 European Respiratory Journal  
In 40 healthy nonsmokers and 20 patients with stable chronic obstructive pulmonary disease (COPD), we performed three N 2 vital capacity SBWs, three N 2 multiple-breath washouts and three tidal DTG-SBW  ...  Main outcomes were the lung clearance index (LCI) (N 2 multiple-breath washout), slope of phase III (dN 2 ) (N 2 vital capacity SBW) and slope of phase III (SIIIDTG) (DTG-SBW).  ...  Acknowledgements The authors would like to thank Mr Rudolf Isler (Eco Medics AG, Duernten, Switzerland) for his valuable technical assistance and Prof.  ... 
doi:10.1183/09031936.00085713 pmid:25102960 fatcat:m7wyp4ugkncpramktzfjfja2gq

Electrical Impedance Tomography Predicts Weaning Success in Adult Patients With Delayed Upper Abdominal Surgery: A Single-Center Retrospective Study

Jiajia Li, Fan Zeng, Fuxun Yang, Xiaoxiu Luo, Rongan Liu, Yinjie Ren, Yunping Lan, Yu Lei, Gaoping Zhao, Xiaobo Huang
2021 Frontiers in Medicine  
deviation of regional ventilation delay index (RVDSD), and global inhomogeneity (GI) using generalized estimation equation analyses.  ...  Objective: To evaluate the predictive value of electrical impedance tomography (EIT) in patients with delayed ventilator withdrawal after upper abdominal surgery.Methods: We retrospectively analyzed data  ...  All authors contributed to the study design, and read and approved the submitted version of the manuscript.  ... 
doi:10.3389/fmed.2021.748493 pmid:34926497 pmcid:PMC8674867 fatcat:vrqxke5aqzcbtpfx6mlt7t23sy

Lung aeration and ventilation after general anesthesia in left lateral position: a prospective observational study using electrical impedance tomography

Yan Wang, Huisheng Xu, Hui Li, Baoli Cheng, Xiangming Fang
2020 Annals of Palliative Medicine  
Possible changes in lung aeration were detected by changes in end-expiratory lung impedance (EELI). Global inhomogeneity index (GI) was also analyzed.  ...  And the change of lung inhomogeneity during ESD procedure is transient.  ...  Patients with hemodynamic instability, chronic obstructive pulmonary disease, bronchial asthma, known interstitial lung disease or any contraindication for the use of EIT such as implantable electronic  ... 
doi:10.21037/apm-20-1029 pmid:33040550 fatcat:nunbrcnztje5flgrowg7pvtr44

Electrical impedance tomography for predicting failure of spontaneous breathing trials in patients with prolonged weaning

Johannes Bickenbach, Michael Czaplik, Mareike Polier, Gernot Marx, Nikolaus Marx, Michael Dreher
2017 Critical Care  
Calculation of EIT parameters was performed, including the impedance ratio (IR), the tidal variation of impedance (TIV), the changes in end-expiratory lung impedance (ΔEELI), the global inhomogeneity index  ...  (GI), and the regional ventilation delay (RVD) index with use of different thresholds of the percentage inspiration time (RVD40, RVD60, RVD80).  ...  Reasons are their comorbidities (e.g., chronic obstructive pulmonary disease), prolonged treatment in the intensive care unit (ICU) in consequence of acute conditions (e.g., septic or cardiogenic shock  ... 
doi:10.1186/s13054-017-1758-2 pmid:28697778 pmcid:PMC5506613 fatcat:ozjohjppyndo3as4obn5icxwba

Positive Expiratory Pressure via Mask Does Not Improve Ventilation Inhomogeneity More than Huffing and Coughing in Individuals with Stable Chronic Obstructive Pulmonary Disease and Chronic Sputum Expectoration

Christian Osadnik, Christopher Stuart-Andrews, Samantha Ellis, Bruce Thompson, Christine F. McDonald, Anne E. Holland
2013 Respiration  
Abstract Background: Positive expiratory pressure (PEP) has been used to promote airway clearance in individuals with chronic obstructive pulmonary disease (COPD) for many years; however, its mechanism  ...  Objectives: It was the aim of this study to determine whether PEP improves ventilation inhomogeneity more than controlled huffing and coughing in individuals with stable COPD.  ...  Acknowledgements The authors would like to thank the staff at the Alfred Health lung function laboratory for their assistance coordinating this study, Sylvia Verbanck for her contribution towards the project  ... 
doi:10.1159/000348546 pmid:23752553 fatcat:czwvtadwgfftpgjgawd2xo637m

Clinical impact of preoperative diaphragm dysfunction on early outcomes and ventilation function in lung transplant: a single-center retrospective study

Sungchul Huh, Woo Hyun Cho, Dohyung Kim, Bong Soo Son, Hye Ju Yeo
2022 Journal of Intensive Care  
Secondary outcomes compared global inhomogeneity index and lung volume after transplantation.  ...  Multivariate regression analysis were used to evaluate the association between preoperative diaphragm dysfunction and prolonged mechanical ventilation after transplantation.  ...  To quantify the tidal volume distribution, the EIT-based global inhomogeneity (GI) index was calculated, which represents an asymmetrical distribution in the lungs [17] .  ... 
doi:10.1186/s40560-022-00614-7 pmid:35570300 pmcid:PMC9107696 fatcat:52rv665uivgk5b74n3ta6vc2qu

Physiological phenotyping of pediatric chronic obstructive airway diseases

Sylvia Nyilas, Florian Singer, Nitin Kumar, Sophie Yammine, Delphine Meier-Girard, Cordula Koerner-Rettberg, Carmen Casaulta, Urs Frey, Philipp Latzin
2016 Journal of applied physiology  
Inert tracer gas washout (IGW) measurements detect increased ventilation inhomogeneity (VI) in chronic lung diseases.  ...  IGW variables used for clustering were lung clearance index (LCI) and convection-dependent [conductive ventilation heterogeneity index (Scond)] and diffusion-convection-dependent variables [acinar ventilation  ...  The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.  ... 
doi:10.1152/japplphysiol.00086.2016 pmid:27231309 fatcat:dfblqu7l5feirpvufvr6eidcg4
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