scholarly journals Electrical impedance tomography applied to assess matching of pulmonary ventilation and perfusion in a porcine experimental model

Critical Care ◽  
2009 ◽  
Vol 13 (2) ◽  
pp. R34 ◽  
Author(s):  
Anneli Fagerberg ◽  
Ola Stenqvist ◽  
Anders Åneman
Keyword(s):  
Experimental Model ◽  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Pulmonary Ventilation ◽  
Impedance Tomography ◽  
Ventilation And Perfusion

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.

What hinders pulmonary gas exchange and changes distribution of ventilation in immobilized white rhinoceroses (Ceratotherium simum) in lateral recumbency?

2020 ◽  
Vol 129 (5) ◽  
pp. 1140-1149
Author(s):  
Martina Mosing ◽  
Andreas D. Waldmann ◽  
Muriel Sacks ◽  
Peter Buss ◽  
Jordyn M. Boesch ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Breath Holding ◽  
Dependent Lung ◽  
Regional Ventilation ◽  
Impedance Tomography ◽  
Ventilation And Perfusion ◽  
Lateral Recumbency ◽  
Nondependent Lung

Electrical impedance tomography measurements of regional ventilation and perfusion applied to etorphine-immobilized white rhinoceroses in lateral recumbency revealed a pronounced disproportional shift of the measured ventilation and perfusion toward the nondependent lung. The dependent lung was minimally ventilated and perfused, but still aerated. Perfusion was found primarily around the hilum of the nondependent lung. These shifts can explain the gas exchange impairments found in this study. Breath holding can redistribute ventilation.

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

scholarly journals Electrical Impedance Tomography for Cardio-Pulmonary Monitoring

2019 ◽  
Vol 8 (8) ◽  
pp. 1176 ◽  
Author(s):  
Christian Putensen ◽  
Benjamin Hentze ◽  
Stefan Muenster ◽  
Thomas Muders
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Lung Perfusion ◽  
Clinical Aspects ◽  
Regional Ventilation ◽  
Impedance Tomography ◽  
Regional Lung ◽  
Lung Overdistension ◽  
Local Ventilation ◽  
Ventilation And Perfusion

Electrical impedance tomography (EIT) is a bedside monitoring tool that noninvasively visualizes local ventilation and arguably lung perfusion distribution. This article reviews and discusses both methodological and clinical aspects of thoracic EIT. Initially, investigators addressed the validation of EIT to measure regional ventilation. Current studies focus mainly on its clinical applications to quantify lung collapse, tidal recruitment, and lung overdistension to titrate positive end-expiratory pressure (PEEP) and tidal volume. In addition, EIT may help to detect pneumothorax. Recent studies evaluated EIT as a tool to measure regional lung perfusion. Indicator-free EIT measurements might be sufficient to continuously measure cardiac stroke volume. The use of a contrast agent such as saline might be required to assess regional lung perfusion. As a result, EIT-based monitoring of regional ventilation and lung perfusion may visualize local ventilation and perfusion matching, which can be helpful in the treatment of patients with acute respiratory distress syndrome (ARDS).

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