Research trends and hotspots in the field of electrical impedance tomography for mechanical ventilation: a bibliometric analysis

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Abstract

Background

Electrical impedance tomography (EIT) is a relatively recent functional imaging technique that is both noninvasive and radiation free. EIT measures the associated voltage when a weak current is applied to the surface of the human body to determine the distribution of electrical resistance within tissues. We performed a bibliometrics-based review to explore the geographic hotspots of current research and future trends developing in the field of EIT for mechanical ventilation.

Methods

The Web of Science database was searched from its inception to June 25, 2023. CiteSpace software was used to visualize and analyze the relevant literature and identify the most impactful literature, trends, and hotspots.

Results

363 articles describing EIT use in mechanical ventilation were identified. A fluctuating growth in the number of publications was observed from 1998 to 2023. Germany had the highest number of articles (n=154), followed by Italy (n=53) and China (n=52). A cluster analysis of keyword co-occurrence revealed that “titration”, “ventilator-related lung injury”, and “oxygenation” were the most actively researched terms associated with the use of EIT in mechanically ventilated patients.

Conclusions

Significant progress has been made in EIT research for mechanical ventilation. EIT research is limited to a small number of countries with a present research focus on the prevention and treatment of ventilator-related lung injury, oxygenation status, and prone ventilation. These topics are expected to remain research hotspots in the future.

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Most cited references 38

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Chest electrical impedance tomography examination, data analysis, terminology, clinical use and recommendations: consensus statement of the TRanslational EIT developmeNt stuDy group

Inez Frerichs, Marcelo B P Amato, Anton H. van Kaam … (2016)

Electrical impedance tomography (EIT) has undergone 30 years of development. Functional chest examinations with this technology are considered clinically relevant, especially for monitoring regional lung ventilation in mechanically ventilated patients and for regional pulmonary function testing in patients with chronic lung diseases. As EIT becomes an established medical technology, it requires consensus examination, nomenclature, data analysis and interpretation schemes. Such consensus is needed to compare, understand and reproduce study findings from and among different research groups, to enable large clinical trials and, ultimately, routine clinical use. Recommendations of how EIT findings can be applied to generate diagnoses and impact clinical decision-making and therapy planning are required. This consensus paper was prepared by an international working group, collaborating on the clinical promotion of EIT called TRanslational EIT developmeNt stuDy group. It addresses the stated needs by providing (1) a new classification of core processes involved in chest EIT examinations and data analysis, (2) focus on clinical applications with structured reviews and outlooks (separately for adult and neonatal/paediatric patients), (3) a structured framework to categorise and understand the relationships among analysis approaches and their clinical roles, (4) consensus, unified terminology with clinical user-friendly definitions and explanations, (5) a review of all major work in thoracic EIT and (6) recommendations for future development (193 pages of online supplements systematically linked with the chief sections of the main document). We expect this information to be useful for clinicians and researchers working with EIT, as well as for industry producers of this technology.

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Bibliometrics: Methods for studying academic publishing

Anton Ninkov, Jason Frank, Lauren A. Maggio (2021)

Bibliometrics is the study of academic publishing that uses statistics to describe publishing trends and to highlight relationships between published works. Likened to epidemiology, researchers seek to answer questions about a field based on data about publications (e.g., authors, topics, funding) in the same way that an epidemiologist queries patient data to understand the health of a population. In this Eye Opener, the authors introduce bibliometrics and define its key terminology and concepts, including relational and evaluative bibliometrics. Readers are introduced to common bibliometric methods and their related strengths and weaknesses. The authors provide examples of bibliometrics applied in health professions education and propose potential future research directions. Health professions educators are consumers of bibliometric reports and can adopt its methodologies for future studies.

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Assessment of regional lung recruitment and derecruitment during a PEEP trial based on electrical impedance tomography.

Hartmut Gehring, Torsten Meier, Thorsten Leibecke … (2008)

To investigate whether electrical impedance tomography (EIT) is capable of monitoring regional lung recruitment and lung collapse during a positive end-expiratory pressure (PEEP) trial. Experimental animal study of acute lung injury. Six pigs with saline-lavage-induced acute lung injury. An incremental and decremental PEEP trial at ten pressure levels was performed. Ventilatory, gas exchange, and hemodynamic parameters were automatically recorded. EIT and computed tomography (CT) scans of the same slice were simultaneously taken at each PEEP level. A significant correlation between EIT and CT analyses of end-expiratory gas volumes (r=0.98 up to 0.99) and tidal volumes (r=0.55 up to r=0.88) could be demonstrated. Changes in global and regional tidal volumes and arterial oxygenation (PaO2/FiO2) demonstrated recruitment/derecruitment during the trial, but at different onsets. During the decremental trial, derecruitment first occurred in dependent lung areas. This was indicated by lowered regional tidal volumes measured in this area and by a decrease of PaO2/FiO2. At the same time, the global tidal volume still continued to increase, because the increase of ventilation of the non-dependent areas was higher than the loss in the dependent areas. This indicates that opposing regional changes might cancel each other out when combined in a global parameter. EIT is suitable for monitoring the dynamic effects of PEEP variations on the regional change of tidal volume. It is superior to global ventilation parameters in assessing the beginning of alveolar recruitment and lung collapse.

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Author and article information

Journal

Journal ID (nlm-ta): J Thorac Dis

Journal ID (iso-abbrev): J Thorac Dis

Journal ID (publisher-id): JTD

Title: Journal of Thoracic Disease

Publisher: AME Publishing Company

ISSN (Print): 2072-1439

ISSN (Electronic): 2077-6624

Publication date (Electronic): 27 March 2024

Publication date (Print): 29 March 2024

Volume: 16

Issue: 3

Pages: 2070-2081

Affiliations

[1 ]deptDepartment of Anesthesiology , Fujian Medical University Union Hospital , Fuzhou, China;

[2 ]deptDepartment of Critical Care Medicine, Respiratory Institute , Cleveland Clinic Foundation , Cleveland, OH, USA;

[3 ]deptDepartment of Medicine , Cleveland Clinic Lerner College of Medicine of Case Western Reserve University , Cleveland, OH, USA;

[4 ]deptPulmonary Department, Respiratory Institute , Cleveland Clinic , Cleveland, OH, USA

Author notes

Contributions: (I) Conception and design: N Lin, ZM Lai; (II) Administrative support: FY Li; (III) Provision of study materials or patients: YM Li, T Yan; (IV) Collection and assembly of data: CJ Fan, HR Luo; (V) Data analysis and interpretation: LL Pan; (VI) Manuscript writing: All authors; (VII) Final approval of manuscript: All authors.

Correspondence to: Zhong-Meng Lai, MD, PhD. Department of Anesthesiology, Fujian Medical University Union Hospital, Xinquan Road 29 ^th, Fuzhou 350001, China. Email: zl7mg@ 123456fjmu.edu.cn .

Author information

Nan Lin https://orcid.org/0009-0007-3048-1182

Zhong-Meng Lai https://orcid.org/0000-0002-3429-1489

Article

Publisher ID: jtd-16-03-2070

DOI: 10.21037/jtd-24-98

PMC ID: 11009609

SO-VID: dbd72d8c-4a16-41c7-b9d1-9e78237b5bc8

License:

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0.

History

Date received : 16 January 2024

Date accepted : 01 March 2024

Funding

Funded by: the Joint Funds for the Innovation of Science and Technology, Fujian Province

Award ID: No. 2020Y9079

Research trends and hotspots in the field of electrical impedance tomography for mechanical ventilation: a bibliometric analysis

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Most cited references 38

Chest electrical impedance tomography examination, data analysis, terminology, clinical use and recommendations: consensus statement of the TRanslational EIT developmeNt stuDy group

Bibliometrics: Methods for studying academic publishing

Assessment of regional lung recruitment and derecruitment during a PEEP trial based on electrical impedance tomography.

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