scholarly journals Lung Perfusion Assessment by Bedside Electrical Impedance Tomography in Critically Ill Patients

2021 ◽  
Vol 12 ◽  
Author(s):  
Mengru Xu ◽  
Huaiwu He ◽  
Yun Long
Keyword(s):  
Critically Ill ◽  
Electrical Impedance Tomography ◽  
Critically Ill Patients ◽  
Clinical Studies ◽  
Electrical Impedance ◽  
Photon Emission ◽  
Lung Perfusion ◽  
Impedance Tomography ◽  
Saline Bolus ◽  
The Impact

As a portable, radiation-free imaging modality, electrical impedance tomography (EIT) technology has shown promise in the bedside visual assessment of lung perfusion distribution in critically ill patients. The two main methods of EIT for assessing lung perfusion are the pulsatility and conductivity contrast (saline) bolus method. Increasing attention is being paid to the saline bolus EIT method in the evaluation of regional pulmonary perfusion in clinical practice. This study seeks to provide an overview of experimental and clinical studies with the aim of clarifying the progress made in the use of the saline bolus EIT method. Animal studies revealed that the saline bolus EIT method presented good consistency with single-photon emission CT (SPECT) in the evaluation of lung regional perfusion changes in various pathological conditions. Moreover, the saline bolus EIT method has been applied to assess the lung perfusion in a pulmonary embolism and the effect of positive end-expiratory pressure (PEEP) on regional ventilation/perfusion ratio (V/Q) and acute respiratory distress syndrome (ARDS) in several clinical studies. The implementation of saline boluses, data analyses, precision, and cutoff values varied among different studies, and a consensus must be reached regarding the clinical application of the saline bolus EIT method. Further study is required to validate the impact of the described saline bolus EIT method on decision-making, therapeutic management, and outcomes in critically ill patients.

scholarly journals Distribution of Ventilation Measured by Electrical Impedance Tomography in Critically Ill Children

2020 ◽  
Vol 65 (5) ◽  
pp. 590-595
Author(s):  
Hussam S Inany ◽  
Jordan S Rettig ◽  
Craig D Smallwood ◽  
John H Arnold ◽  
Brian K Walsh
Keyword(s):  
Critically Ill ◽  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Critically Ill Children ◽  
Impedance Tomography

scholarly journals EXPRESS: Rapid dynamic bedside assessment of pulmonary perfusion defect by electrical impedance tomography in a patient with acute massive pulmonary embolism

2020 ◽  
pp. 204589402098404
Author(s):  
Siyi Yuan ◽  
Huaiwu He ◽  
Yun Long ◽  
Yi Chi ◽  
Inéz Frerichs ◽  
...  
Keyword(s):  
Pulmonary Embolism ◽  
Electrical Impedance Tomography ◽  
Perfusion Defect ◽  
Electrical Impedance ◽  
Massive Pulmonary Embolism ◽  
Lung Perfusion ◽  
Regional Perfusion ◽  
Pulmonary Perfusion ◽  
Impedance Tomography ◽  
Regional Lung

Background: Several animal studies have shown that regional lung perfusion could be effectively estimated by the hypertonic saline contrast electrical impedance tomography (EIT) method. Here, we reported an application of this method to dynamically assess regional pulmonary perfusion defect in a patient with acute massive pulmonary embolism. Case presentation: A 68-year-old man experienced sudden dyspnea and cardiac arrest during out-of-bed physical activity on the first day after partial mediastinal tumor resection. Acute pulmonary embolism (PE) was suspected due to acute enlargement of right heart and fixed inferior venous cava measured with bedside ultrasound. The computed tomography pulmonary angiography further confirmed large embolism in both left and right main pulmonary arteries and branches. The regional time impedance curves, which were obtained by a bolus of 10ml 10% NaCl through the central venous catheter, were then analyzed to quantitatively assess regional perfusion. Normal ventilation distribution with massive defects in regional perfusion in both lungs was observed, leading to a ventilation-perfusion mismatch and low oxygenation index (PaO2/FiO2=86 mmHg) at the first day of PE. The anticoagulation was performed with heparin, and the patient’s condition (such as shock, dyspnea, hypoxemia etc.), regional lung perfusion defect and ventilation-perfusion mismatch continuously improved in the following days. Conclusions: This case implies that EIT might have the potential to assess and monitor regional perfusion for rapid diagnosis of fatal PE in clinical practice.

Assessment of Changes in Distribution of Lung Perfusion by Electrical Impedance Tomography

Respiration ◽  
2009 ◽  
Vol 77 (3) ◽  
pp. 282-291 ◽  
Author(s):  
Inéz Frerichs ◽  
Sven Pulletz ◽  
Gunnar Elke ◽  
Florian Reifferscheid ◽  
Dirk Schädler ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Lung Perfusion ◽  
Impedance Tomography

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).

scholarly journals Functional Regions of Interest in Electrical Impedance Tomography: A Secondary Analysis of Two Clinical Studies

PLoS ONE ◽  
2016 ◽  
Vol 11 (3) ◽  
pp. e0152267 ◽  
Author(s):  
Tobias Becher ◽  
Barbara Vogt ◽  
Matthias Kott ◽  
Dirk Schädler ◽  
Norbert Weiler ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Clinical Studies ◽  
Electrical Impedance ◽  
Secondary Analysis ◽  
Regions Of Interest ◽  
Impedance Tomography ◽  
Functional Regions
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