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electrical impedance tomography

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https://www.readbyqxmd.com/read/28411422/ventilation-distribution-and-lung-recruitment-with-speaking-valve-use-in-tracheostomised-patient-weaning-from-mechanical-ventilation-in-intensive-care
#1
Anna-Liisa Sutt, Chris M Anstey, Lawrence R Caruana, Petrea L Cornwell, John F Fraser
PURPOSE: Speaking valves (SV) are used infrequently in tracheostomised ICU patients due to concerns regarding their putative effect on lung recruitment. A recent study in cardio-thoracic population demonstrated increased end-expiratory lung volumes during and post SV use without examining if the increase in end-expiratory lung impedance (EELI) resulted in alveolar recruitment or potential hyperinflation in discrete loci. MATERIALS AND METHODS: A secondary analysis of Electrical Impedance Tomography (EIT) data from a previous study was conducted...
April 8, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28409685/monitoring-of-pneumothorax-appearance-with-electrical-impedance-tomography-during-recruitment-maneuvers
#2
Caio C A Morais, Roberta R De Santis Santiago, José R B de Oliveira Filho, Adriana S Hirota, Pedro H D Pacce, Juliana C Ferreira, Erick D L B Camargo, Marcelo B P Amato, Eduardo L V Costa
No abstract text is available yet for this article.
April 15, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28387710/in-vivo-bioimpedance-spectroscopy-characterization-of-healthy-hemorrhagic-and-ischemic-rabbit-brain-within-10-hz-1-mhz
#3
Lin Yang, Wenbo Liu, Rongqing Chen, Ge Zhang, Weichen Li, Feng Fu, Xiuzhen Dong
Acute stroke is a serious cerebrovascular disease and has been the second leading cause of death worldwide. Conventional diagnostic modalities for stroke, such as CT and MRI, may not be available in emergency settings. Hence, it is imperative to develop a portable tool to diagnose stroke in a timely manner. Since there are differences in impedance spectra between normal, hemorrhagic and ischemic brain tissues, multi-frequency electrical impedance tomography (MFEIT) shows great promise in detecting stroke. Measuring the impedance spectra of healthy, hemorrhagic and ischemic brain in vivo is crucial to the success of MFEIT...
April 7, 2017: Sensors
https://www.readbyqxmd.com/read/28380204/pendelluft-diagnosed-from-ventilator-weaning-indexes-obtained-through-bioelectrical-impedance-tomography-a-case-report
#4
Fabiana Aparecida Lopes, Lidiane Andrade Monteiro de Souza, Juliana Tavares Neves Bernardi, Carlos Eduardo Rocha, Luciana Castilho de Figueiredo, Ana Paula Ragonete Dos Anjos Agostini, Desanka Dragosavac, Daniela Cristina Dos Santos Faez
CONTEXT: Today, through major technological advances in diagnostic resources within medicine, evaluation and monitoring of clinical parameters at the patient's bedside in intensive care units (ICUs) has become possible. CASE REPORT: This case report presents results and interpretations from predictive mechanical ventilation weaning indexes obtained through monitoring using chest electrical bioimpedance tomography. These indexes included maximum inspiratory pressure, maximum expiratory pressure, shallow breathing index and spontaneous breathing test...
April 3, 2017: São Paulo Medical Journal, Revista Paulista de Medicina
https://www.readbyqxmd.com/read/28352002/optimisation-of-current-injection-protocol-based-on-a-region-of-interest
#5
Mayo Faulkner, Markus Jehl, Kirill Aristovich, James Avery, Anna Witkowska-Wrobel, David Holder
Electrical Impedance Tomography has the potential to image fast neural activity associated with physiological or epileptic activity throughout the brain. These applications pose a particular challenge as expected voltage changes on the electrodes are less than 1% and geometrical constraints of the body under investigation mean that electrodes can not be evenly distributed around its boundary. Unlike other applications, however, information regarding the location of expected activity is typically available. An informative method for choosing current paths that maximise sensitivity to specific regions is desirable...
March 29, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28339394/global-and-regional-assessment-of-sustained-inflation-pressure-volume-curves-in-patients-with-acute-respiratory-distress-syndrome
#6
Tobias Becher, Philipp Rostalski, Matthias Kott, Andy Adler, Dirk Schadler, Norbert Weiler, Inez Frerichs
Static or quasi-static pressure-volume (P-V) curves can be used to determine the lung mechanical properties of patients suffering from acute respiratory distress syndrome (ARDS). According to the traditional interpretation, lung recruitment occurs mainly below the lower point of maximum curvature (LPMC) of the inflation P-V curve. Although some studies have questioned this assumption, setting of positive end-expiratory pressure 2 cmH2O above the LPMC was part of a "lung-protective" ventilation strategy successfully applied in several clinical trials...
March 24, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28328787/prone-positioning-improves-ventilation-homogeneity-in-children-with-acute-respiratory-distress-syndrome
#7
Alison Lupton-Smith, Andrew Argent, Peter Rimensberger, Inez Frerichs, Brenda Morrow
OBJECTIVES: To determine the effect of prone positioning on ventilation distribution in children with acute respiratory distress syndrome. DESIGN: Prospective observational study. SETTING: Paediatric Intensive Care at Red Cross War Memorial Children's Hospital, Cape Town, South Africa. PATIENTS: Mechanically ventilated children with acute respiratory distress syndrome. INTERVENTIONS: Electrical impedance tomography measures were taken in the supine position, after which the child was turned into the prone position, and subsequent electrical impedance tomography measurements were taken...
March 21, 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/28328587/bedside-breath-wise-visualization-of-bronchospasm-by-electrical-impedance-tomography-could-improve-perioperative-patient-safety-a-case-report
#8
Pedro de la Oliva, Andreas D Waldmann, Stephan H Böhm, Cristina Verdú-Sánchez, Antonio Pérez-Ferrer, Elena Alvarez-Rojas
Bronchospasm appears in up to 4% of patients with obstructive lung disease or respiratory infection undergoing general anesthesia. Clinical examination alone may miss bronchospasm. As a consequence, subsequent (mis)treatment and ventilator settings could lead to pulmonary hyperinflation, hypoxia, hypercapnia, hypotension, patient-ventilator asynchrony, volutrauma, or barotrauma. Electrical impedance tomography (EIT), a new noninvasive technique, can potentially identify bronchospasms by determining regional expiratory time constants (τ) for each one of the pixels of a functional EIT image...
March 15, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28325021/evaluation-of-lung-ventilation-distribution-in-chronic-obstructive-pulmonary-disease-patients-using-the-global-inhomogeneity-index
#9
F Trenk, L Mendes, P Carvalho, R P Paiva, J Henriques, N Maglaveras, I Chouvarda, V Tsara, C A Teixeira
The global inhomogeneity (GI) index is a electrical impedance tomography (EIT) parameter that quantifies the tidal volume distribution within the lung. In this work the global inhomogeneity index was computed for twenty subjects in order to evaluate his potential use in the detection and follow up of chronic obstructive pulmonary disease (COPD) patients. EIT data of 17 subjects were acquired: 14 patients with the main diagnoses of COPD and 3 healthy subjects which served as a control group. Two or three datasets of around 30 seconds were acquired at 33 scans/s and analysed for each subject...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28294957/regional-ventilation-redistribution-measured-by-electrical-impedance-tomography-during-spontaneous-breathing-trial-with-automatic-tube-compensation
#10
Yeong-Long Hsu, Ai-Jia Tien, Mei-Yun Chang, Hao-Tai Chang, Knut Moeller, Inez Frerichs, Zhanqi Zhao
Automatic tube compensation (ATC) was developed to overcome the flow resistance of endotracheal tube and decrease the imposed work of breathing. Although ATC is used as an evidence-based strategy to predict successful weaning from assisted ventilation, the changes in regional ventilation distribution induced by this technique are not known. We hypothesized that continuous positive airway pressure plus ATC (CPAP+100%ATC) could reactivate the respiratory muscles in patients with prolonged mechanical ventilation (PMV) more effectively than volume assist-control mandatory ventilation (ACMV)...
March 15, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28282026/comparative-study-of-separation-between-ex-vivo-prostatic-malignant-and-benign-tissue-using-electrical-impedance-spectroscopy-and-electrical-impedance-tomography
#11
Ethan K Murphy, Aditya Mahara, Shadab Khan, Elias Hyams, Alan Schned, Jason Pettus, Ryan Halter
Currently no efficient and reliable technique exists to routinely assess surgical margins during a radical prostatectomy. Electrical impedance spectroscopy (EIS) has been reported as a potential technique to provide surgeons with real-time intraoperative margin assessment. In addition to providing a quantified measure of margin status, a co-registered electrical impedance tomography (EIT) image presented on a surgeon's workstation could add value to the margin assessment process. To investigate this, we conducted a comparative study between EIS and EIT to evaluate the potential these technologies might have for margin assessment...
March 10, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28269217/non-invasive-monitoring-of-pulmonary-artery-pressure-at-the-bedside
#12
M Proenca, F Braun, E Muntane, J Sola, A Adler, M Lemay, J-Ph Thiran, S F Rimoldi
Current solutions for the monitoring of pulmonary artery pressure (PAP) in patients suffering from pulmonary hypertension are limited to invasive means. Non-invasive alternatives, such as Doppler echocardiography, are incompatible with continuous monitoring due to their dependency on qualified personnel to perform the measurements. In the present study, a novel non-invasive and unsupervised approach based on the use of electrical impedance tomography (EIT) is presented. The approach was evaluated in three healthy subjects undergoing hypoxia-induced variations in PAP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267946/global-tidal-variations-regional-distribution-of-ventilation-and-the-regional-onset-of-filling-determined-by-electrical-impedance-tomography-reproducibility
#13
L R Caruana, A G Barnett, O Tronstad, J D Paratz, A T Chang, J F Fraser
The reproducibility of the regional distribution of ventilation and the timing of onset of regional filling as measured by electrical impedance tomography lacks evidence. This study investigated whether electrical impedance tomography measurements in healthy males were reproducible when electrodes were replaced between measurements. Part 1: Recordings of five volunteers lying supine were made using electrical impedance tomography and a pneumotachometer. Measurements were repeated at least three hours later...
March 2017: Anaesthesia and Intensive Care
https://www.readbyqxmd.com/read/28244706/-her-shape-intervention-programme-for-obese-women-with-high-breast-adiposity
#14
Norsham Juliana, Suzana Shahar, Mohd Azmani Sahar, Ahmad Rohi Ghazali, Zahara Abdul Manaf, Rahim Md Noah
BACKGROUND AND OBJECTIVES: Nutrition and physical activity interventions is beneficial in reversing obesity. However far too little attention has been paid to the effect of these interventions on breast tissues. Thus, the aim of this study was to explore the effect of a home-based dietary and physical activity intervention (the Her Shape Program) on metabolic parameters, blood biomarkers and adiposity at the breast. METHODS AND STUDY DESIGN: A randomized controlled study was conducted on obese women with high breast adiposity (<0...
March 2017: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28237681/assessment-of-distribution-of-ventilation-and-regional-lung-compliance-by-electrical-impedance-tomography-in-anaesthetized-horses-undergoing-alveolar-recruitment-manoeuvres
#15
Tamas D Ambrisko, Johannes Schramel, Klaus Hopster, Sabine Kästner, Yves Moens
OBJECTIVE: To examine changes in the distribution of ventilation and regional lung compliances in anaesthetized horses during the alveolar recruitment manoeuvre (ARM). STUDY DESIGN: Experimental study in which a series of treatments were administered in a fixed order on one occasion. ANIMALS: Five adult Warmblood horses. METHODS: Animals were anaesthetized (xylazine, midazolam-ketamine, isoflurane), placed in dorsal recumbency and ventilated with 100% oxygen using peak inspiratory pressure (PIP) and positive end-expiratory pressure (PEEP) of 20 cmH2O and 0 cmH2O, respectively...
January 12, 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/28227703/evaluation-of-lung-ventilation-distribution-in-chronic-obstructive-pulmonary-disease-patients-using-the-global-inhomogeneity-index
#16
F Trenk, L Mendes, P Carvalho, R P Paiva, J Henriques, N Maglaveras, I Chouvarda, V Tsara, C A Teixeira, F Trenk, L Mendes, P Carvalho, R P Paiva, J Henriques, N Maglaveras, I Chouvarda, V Tsara, C A Teixeira, P Carvalho, V Tsara, L Mendes, C A Teixeira, J Henriques, F Trenk, N Maglaveras, I Chouvarda, R P Paiva
The global inhomogeneity (GI) index is a electrical impedance tomography (EIT) parameter that quantifies the tidal volume distribution within the lung. In this work the global inhomogeneity index was computed for twenty subjects in order to evaluate his potential use in the detection and follow up of chronic obstructive pulmonary disease (COPD) patients. EIT data of 17 subjects were acquired: 14 patients with the main diagnoses of COPD and 3 healthy subjects which served as a control group. Two or three datasets of around 30 seconds were acquired at 33 scans/s and analysed for each subject...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227447/non-invasive-monitoring-of-pulmonary-artery-pressure-at-the-bedside
#17
M Proenca, F Braun, E Muntane, J Sola, A Adler, M Lemay, J-Ph Thiran, S F Rimoldi, M Proenca, F Braun, E Muntane, J Sola, A Adler, M Lemay, J-Ph Thiran, S F Rimoldi, S F Rimoldi, E Muntane, J Sola, M Lemay, A Adler, J-Ph Thiran, F Braun
Current solutions for the monitoring of pulmonary artery pressure (PAP) in patients suffering from pulmonary hypertension are limited to invasive means. Non-invasive alternatives, such as Doppler echocardiography, are incompatible with continuous monitoring due to their dependency on qualified personnel to perform the measurements. In the present study, a novel non-invasive and unsupervised approach based on the use of electrical impedance tomography (EIT) is presented. The approach was evaluated in three healthy subjects undergoing hypoxia-induced variations in PAP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28224077/electrical-impedance-tomography-and-trans-pulmonary-pressure-measurements-in-a-patient-with-extreme-respiratory-drive
#18
Atsuko Shono, Peter Somhorst, Diederik Gommers
Preserving spontaneous breathing during mechanical ventilation prevents muscle atrophy of the diaphragm, but may lead to ventilator induced lung injury (VILI). We present a case in which monitoring of trans-pulmonary pressure and ventilation distribution using Electrical Impedance Tomography (EIT) provided essential information for preventing VILI.
2017: Respiratory Medicine Case Reports
https://www.readbyqxmd.com/read/28212050/volume-controlled-ventilation-does-not-prevent-injurious-inflation-during-spontaneous-effort
#19
Takeshi Yoshida, Susumu Nakahashi, Maria Aparecida Miyuki Nakamura, Yukiko Koyama, Rollin Roldan, Vinicius Torsani, Roberta R De Santis, Susimeire Gomes, Akinori Uchiyama, Marcelo B P Amato, Brian P Kavanagh, Yuji Fujino
RATIONALE: Spontaneous breathing during mechanical ventilation increases transpulmonary pressure and tidal volume, and worsens lung injury. Intuitively, controlling tidal volume and transpulmonary pressure might limit injury from added spontaneous effort. OBJECTIVES: To test the hypothesis that during spontaneous effort in injured lungs, tidal volume and transpulmonary pressure limitation by volume-controlled ventilation results in less injurious patterns of inflation...
February 17, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28205251/multishot-echo-planar-mreit-for-fast-imaging-of-conductivity-current-density-and-electric-field-distributions
#20
Munish Chauhan, Rohini Vidya Shankar, Neeta Ashok Kumar, Vikram D Kodibagkar, Rosalind Sadleir
PURPOSE: Magnetic resonance electrical impedance tomography (MREIT) sequences typically use conventional spin or gradient echo-based acquisition methods for reconstruction of conductivity and current density maps. Use of MREIT in functional and electroporation studies requires higher temporal resolution and faster sequences. Here, single and multishot echo planar imaging (EPI) based MREIT sequences were evaluated to see whether high-quality MREIT phase data could be obtained for rapid reconstruction of current density, conductivity, and electric fields...
February 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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