scholarly journals Hyperoxia affects the regional pulmonary ventilation/perfusion ratio: an electrical impedance tomography study

2014 ◽  
Vol 58 (6) ◽  
pp. 716-725 ◽  
Author(s):  
Y. LI ◽  
E. TESSELAAR ◽  
J. B. BORGES ◽  
S. H. BÖHM ◽  
F. SJÖBERG ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Pulmonary Ventilation ◽  
Impedance Tomography ◽  
Ventilation Perfusion Ratio

scholarly journals Evaluation of Regional Pulmonary Ventilation in Spontaneously Breathing Patients with Idiopathic Pulmonary Fibrosis (IPF) Employing Electrical Impedance Tomography (EIT): A Pilot Study from the European IPF Registry (eurIPFreg)

2021 ◽  
Vol 10 (2) ◽  
pp. 192
Author(s):  
Ekaterina Krauss ◽  
Daniel van der Beck ◽  
Isabel Schmalz ◽  
Jochen Wilhelm ◽  
Silke Tello ◽  
...  
Keyword(s):  
Idiopathic Pulmonary Fibrosis ◽  
Pulmonary Fibrosis ◽  
Electrical Impedance Tomography ◽  
Spontaneous Breathing ◽  
Electrical Impedance ◽  
Statistical Significance ◽  
Pulmonary Ventilation ◽  
Healthy Controls ◽  
Impedance Tomography ◽  
Spontaneously Breathing

Objectives: In idiopathic pulmonary fibrosis (IPF), alterations in the pulmonary surfactant system result in an increased alveolar surface tension and favor repetitive alveolar collapse. This study aimed to assess the usefulness of electrical impedance tomography (EIT) in characterization of regional ventilation in IPF. Materials and methods: We investigated 17 patients with IPF and 15 healthy controls from the University of Giessen and Marburg Lung Center (UGMLC), Germany, for differences in the following EIT parameters: distribution of ventilation (TID), global inhomogeneity index (GI), regional impedance differences through the delta of end-expiratory lung impedance (dEELI), differences in surface of ventilated area (SURF), as well as center of ventilation (CG) and intratidal gas distribution (ITV). These parameters were assessed under spontaneous breathing and following a predefined escalation protocol of the positive end-expiratory pressure (PEEP), applied through a face mask by an intensive care respirator (EVITA, Draeger, Germany). Results: Individual slopes of dEELI over the PEEP increment protocol were found to be highly significantly increased in both groups (p < 0.001) but were not found to be significantly different between groups. Similarly, dTID slopes were increasing in response to PEEP, but this did not reach statistical significance within or between groups. Individual breathing patterns were very heterogeneous. There were no relevant differences of SURF, GI or CGVD over the PEEP escalation range. A correlation of dEELI to FVC, BMI, age, or weight did not forward significant results. Conclusions: In this study, we did see a significant increase in dEELI and a non-significant increase in dTID in IPF patients as well as in healthy controls in response to an increase of PEEP under spontaneous breathing. We propose the combined measurements of EIT and lung function to assess regional lung ventilation in spontaneously breathing subjects.

scholarly journals Redistribution of pulmonary ventilation after lung surgery detected with electrical impedance tomography

2019 ◽  
Vol 64 (4) ◽  
pp. 517-525 ◽  
Author(s):  
Martin Lehmann ◽  
Beatrice Oehler ◽  
Jonas Zuber ◽  
Uwe Malzahn ◽  
Thorsten Walles ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Pulmonary Ventilation ◽  
Lung Surgery ◽  
Impedance Tomography

Combined effects of body positioning and noninvasive ventilation on the regional distribution of pulmonary ventilation evaluated by electrical impedance tomography in the young and the elderly

2019 ◽  
Author(s):  
Liegina Silveira Marinho ◽  
Andrea Nobrega Cirino Nogueira Da Nobrega Cirino Nogueira ◽  
Juliana Arcanjo Lino ◽  
Gabriela De Carvalho Gomes Frota ◽  
Renata Dos Santos Vasconcelos ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Noninvasive Ventilation ◽  
Electrical Impedance ◽  
Pulmonary Ventilation ◽  
Regional Distribution ◽  
The Elderly ◽  
Combined Effects ◽  
Impedance Tomography ◽  
Body Positioning

An image reconstruction algorithm for electrical impedance tomography using Symkaczmarz based on structured sparse representation

2018 ◽  
Vol 41 (10) ◽  
pp. 2803-2815
Author(s):  
Qi Wang ◽  
Jing He ◽  
Jianming Wang ◽  
Xiuyan Li ◽  
Xiaojie Duan ◽  
...  
Keyword(s):  
Image Reconstruction ◽  
Sparse Representation ◽  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Pulmonary Ventilation ◽  
Inverse Operator ◽  
Reconstruction Algorithm ◽  
Underlying Structure ◽  
Impedance Tomography ◽  
Ventilation Imaging

Electrical impedance tomography (EIT) is a new medical imaging technology that is used to estimate changes in the internal conductivity based on measurements of the border voltage disturbance. However, the generalized inverse operator of image reconstruction for EIT is ill-posed and ill-conditioned. In order to improve reconstruction quality, the structured sparse representation is integrated into the iterative process of the Symkaczmarz algorithm for EIT image reconstruction in this paper. The sparsity prior and the underlying structure characteristics of conductivity reconstruction are considered in the proposed algorithm. Both simulation and experiment results indicate that the proposed method has feasibility for pulmonary ventilation imaging and great potential for improving the image quality.

scholarly journals Electrical Impedance Tomography: Monitoring of Pulmonary Ventilation in Pediatric Cardiac Postoperative

2021 ◽  
Vol 4 (3) ◽  
Author(s):  
Carolina Vieira de Campos ◽  
Paula Vieira Vincenzi Gaiolla ◽  
Marcelo Bisegli Jatene ◽  
Cintia Johnston ◽  
Werther Brunow de Carvalho
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Pulmonary Ventilation ◽  
Impedance Tomography
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