Comparison of different functional EIT approaches to quantify tidal ventilation distribution

Zhao, Zhanqi; Yun, Po-Jen; Kuo, Yen‐Liang; Fu, Feng; Dai, Meng; Frerichs, Inéz; Möller, Knut

doi:10.1088/1361-6579/aa9eb4

Cited by 22 publications

(17 citation statements)

References 26 publications

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“…changes of skin condition, electrode position, thorax shape etc., baseline drift would be induced. Care should be taken when interpreting continuous long term EIT data, since some of the standard functional EITs would not be valid [5]. Although EIT has the potential to detect patient-ventilator asynchrony, diseases progression and to evaluate treatment efficiency, up to now there are no systematic studies exploring the feasibility and validity of long term EIT monitoring.…”

Section: Discussion and Future Workmentioning

confidence: 99%

“…According to the current injection and reconstruction principles, EIT can be categorized to absolute EIT [14,15] and difference EIT (including frequency-difference [3,4] and timedifference EIT [5,6]). Due to technical difficulties, only time-difference EIT is used in current commercial EIT devices and clinical applications [143].…”

Section: Clinical Applications Of Time-difference Eitmentioning

confidence: 99%

“…They found that ventilation distribution in dependent regions increased significantly during NAVA as compared to pressure support ventilation (PSV). Besides, with EIT it is possible to assess the regional inspiration time [5] and expiratory time [162], as well as the regional distribution of air trapping to set external PEEP [182].…”

Section: Applications In Patients With Obstructive Lung Diseasesmentioning

confidence: 99%

“…The images obtained from EIT can be classified as absolute and difference images. Difference EIT includes frequency-difference [3,4] and time-difference [5,6]. Timedifference images [7,8] are commercially available and these devices determine changes in the internal impeditivity with respect to a reference impeditivity distribution.…”

Section: Introductionmentioning

confidence: 99%

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A review of electrical impedance tomography in lung applications: Theory and algorithms for absolute images

Martins

Sato

Moura

et al. 2019

Annual Reviews in Control

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Electrical Impedance Tomography (EIT) is under fast development, the present paper is a review of some procedures that are contributing to improve spatial resolution and material properties accuracy, admitivitty or impeditivity accuracy. A review of EIT medical applications is presented and they were classified into three broad categories: ARDS patients, obstructive lung diseases and perioperative patients. The use of absolute EIT image may enable the assessment of absolute lung volume, which may significantly improve the clinical acceptance of EIT. The Control Theory, the State Observers more specifically, have a developed theory that can be used for the design and operation of EIT devices. Electrode placement, current injection strategy and electrode electric potential measurements strategy should maximize the number of observable and controllable directions of the state vector space. A non-linear stochastic state observer, the Unscented Kalman Filter, is used directly for the reconstruction of absolute EIT images. Historically, difference images were explored first since they are more stable in the presence of modelling errors. Absolute images require more detailed models of contact impedance, stray capacitance and properly refined finite element mesh where the electric potential gradient is high. Parallelization of the forward *

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Section: Discussion and Future Workmentioning

confidence: 99%

Section: Clinical Applications Of Time-difference Eitmentioning

confidence: 99%

Section: Applications In Patients With Obstructive Lung Diseasesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A review of electrical impedance tomography in lung applications: Theory and algorithms for absolute images

Martins

Sato

Moura

et al. 2019

Annual Reviews in Control

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“…EIT data analysis was achieved using customized software developed with MATLAB (R2015a; MathWorks). Functional ventilation map was derived from averaging the tidal impedance variation images ( 8 ). Functional perfusion map was calculated as the slope of regional impedance–time curves after saline bolus injection ( 7 ).…”

Section: Methodsmentioning

confidence: 99%

Bedside Evaluation of Pulmonary Embolism by Saline Contrast Electrical Impedance Tomography Method: A Prospective Observational Study

Chi

Long

et al. 2020

Am J Respir Crit Care Med

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The incidence and interpretation of large differences in EIT-based measures for PEEP titration in ARDS patients

Zhao

Lee

Chang

et al. 2019

J Clin Monit Comput

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Positive end-expiratory pressure (PEEP) can be titrated by electrical impedance tomography (EIT). The aim of the present study was to examine the performance of different EIT measures during PEEP trials with the aim of identifying "optimum" PEEP and to provide possible interpretations of largely diverging results. After recruitment (maximum plateau pressure 35 cmH 2 O), decremental PEEP trial with steps of 2 cmH 2 O and duration of 2 min per step was performed. Ventilation gain and loss, the global inhomogeneity (GI) index, trend of end-expiratory lung impedance (EELI) and regional compliance (C reg ) for estimation of overdistension and collapse were calculated. Largely diverging results of PEEP selection among the measures were defined as differences ≥ 4 PEEP steps (i.e. ≥ 8 cmH 2 O). In 30 ARDS patients we examined so far, 3 patients showed significant differences in PEEP selections. Overdistension and collapse estimation based on C reg tended to select lower PEEP while the GI index and EELI trend suggested higher PEEP settings. Regional inspiration times were heterogeneous indicating that the assumption of a uniform driving pressure in the calculation of C reg may not be valid. Judging by the predominant ventilation distribution in the most dependent regions, these patients were non-recruitable with the applied recruitment method or pressure levels. The existence of differences in the recommended PEEP among the analyzed EIT measures might be an indicator of non-recruitable lungs and heterogeneous airway resistances. In these extreme cases, the largely diverging results may prompt the attending clinician to develop individual ventilation strategies. Clinical Trial Registration Registration number NCT03112512, https ://clini caltr ials.gov/ Registered 13 April 2017.

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Comparison of different functional EIT approaches to quantify tidal ventilation distribution

Cited by 22 publications

References 26 publications

A review of electrical impedance tomography in lung applications: Theory and algorithms for absolute images

A review of electrical impedance tomography in lung applications: Theory and algorithms for absolute images

Bedside Evaluation of Pulmonary Embolism by Saline Contrast Electrical Impedance Tomography Method: A Prospective Observational Study

The incidence and interpretation of large differences in EIT-based measures for PEEP titration in ARDS patients

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