scholarly journals Cardiac-related impedance changes obtained by electrical impedance tomography: an acceptable parameter for assessment of pulmonary perfusion?

Critical Care ◽  
2011 ◽  
Vol 15 (3) ◽  
pp. 430 ◽  
Author(s):  
Gerhard Hellige ◽  
Guenter Hahn
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Pulmonary Perfusion ◽  
Impedance Tomography ◽  
Acceptable Parameter

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.

Determinants of pulmonary perfusion measured by electrical impedance tomography

2004 ◽  
Vol 92 (1-2) ◽  
pp. 45-49 ◽  
Author(s):  
Henk J. Smit ◽  
Anton Vonk Noordegraaf ◽  
J. Tim Marcus ◽  
Anco Boonstra ◽  
Peter M. de Vries ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Pulmonary Perfusion ◽  
Impedance Tomography

Pulmonary perfusion measured by means of electrical impedance tomography

1998 ◽  
Vol 19 (2) ◽  
pp. 263-273 ◽  
Author(s):  
Anton Vonk Noordegraaf ◽  
Peter W A Kunst ◽  
André Janse ◽  
Johan T Marcus ◽  
Pieter E Postmus ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Pulmonary Perfusion ◽  
Impedance Tomography

Introducing a Linear Gamma Variate Fit to Measure Pulmonary Perfusion with Electrical Impedance Tomography

2020 ◽  
Vol 6 (3) ◽  
pp. 345-348
Author(s):  
Felix Schuderer ◽  
Michael Kircher ◽  
Olaf Dössel ◽  
Birgit Stender ◽  
Thomas Bluth ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Indicator Dilution ◽  
Dilution Method ◽  
Pulmonary Perfusion ◽  
Impedance Tomography ◽  
Nonlinear Fitting ◽  
Gamma Variate ◽  
Linear Approach ◽  
Linear And Nonlinear

AbstractThe indicator dilution method (IDM) is one approach to measure pulmonary perfusion using Electrical Impedance Tomography (EIT). To be able to calculate perfusion parameters and to increase robustnes, it is necessary to approximate and then to separate the components of the measured signals. The component referring to the passage of the injected bolus through the pixels can be modeled as a gamma variate function, its parameters are often determined using nonlinear optimization algorithms. In this paper, we introduce a linear approach that enables higher robustnes and faster computation, and compare the linear and nonlinear fitting approach on data of an animal study.

Electrical impedance tomography to measure pulmonary perfusion: is the reproducibility high enough for clinical practice?

2003 ◽  
Vol 24 (2) ◽  
pp. 491-499 ◽  
Author(s):  
H J Smit ◽  
M L Handoko ◽  
A Vonk Noordegraaf ◽  
Th J C Faes ◽  
P E Postmus ◽  
...  
Keyword(s):  
Clinical Practice ◽  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Pulmonary Perfusion ◽  
Impedance Tomography
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