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Kirimi MT, Hoare D, Holsgrove M, Czyzewski J, Mirzai N, Mercer JR, Neale SL. Detection of Blood Clots Using a Whole Stent as an Active Implantable Biosensor. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2304748. [PMID: 38342628 DOI: 10.1002/advs.202304748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 09/28/2023] [Indexed: 02/13/2024]
Abstract
Many cardiovascular problems stem from blockages that form within the vasculature and often treatment includes fitting a stent through percutaneous coronary intervention. This offers a minimally invasive therapy but re-occlusion through restenosis or thrombosis formation often occurs post-deployment. Research is ongoing into the creation of smart stents that can detect the occurrence of further problems. In this study, it is shown that selectively metalizing a non-conductive stent can create a set of electrodes that are capable of detecting a build-up of material around the stent. The associated increase in electrical impedance across the electrodes is measured, testing the stent with blood clot to mimic thrombosis. It is shown that the device is capable of sensing different amounts of occlusion. The stent can reproducibly sense the presence of clot showing a 16% +/-3% increase in impedance which is sufficient to reliably detect the clot when surrounded by explanted aorta (one sample t-test, p = 0.009, n = 9). It is demonstrated that this approach can be extended beyond the 3D printed prototypes by showing that it can be applied to a commercially available stent and it is believed that it can be further utilized by other types of medical implants.
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Affiliation(s)
- Mahmut Talha Kirimi
- Centre for Medical and Industrial Ultrasonics, James Watt School of Engineering, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Daniel Hoare
- Institute of Cardiovascular and Medical Sciences/British Heart Foundation, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Michael Holsgrove
- BioElectronics Unit, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Jakup Czyzewski
- BioElectronics Unit, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Nosrat Mirzai
- BioElectronics Unit, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, G12 8QQ, UK
| | - John R Mercer
- Institute of Cardiovascular and Medical Sciences/British Heart Foundation, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Steve L Neale
- Centre for Medical and Industrial Ultrasonics, James Watt School of Engineering, University of Glasgow, Glasgow, G12 8QQ, UK
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Leerson J, Tulloh A, Lopez FT, Gregory S, Buscher H, Rosengarten G. Detecting Oxygenator Thrombosis in ECMO: A Review of Current Techniques and an Exploration of Future Directions. Semin Thromb Hemost 2024; 50:253-270. [PMID: 37640048 DOI: 10.1055/s-0043-1772843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
Extracorporeal membrane oxygenation (ECMO) is a life-support technique used to treat cardiac and pulmonary failure, including severe cases of COVID-19 (coronavirus disease 2019) involving acute respiratory distress syndrome. Blood clot formation in the circuit is one of the most common complications in ECMO, having potentially harmful and even fatal consequences. It is therefore essential to regularly monitor for clots within the circuit and take appropriate measures to prevent or treat them. A review of the various methods used by hospital units for detecting blood clots is presented. The benefits and limitations of each method are discussed, specifically concerning detecting blood clots in the oxygenator, as it is concluded that this is the most critical and challenging ECMO component to assess. We investigate the feasibility of solutions proposed in the surrounding literature and explore two areas that hold promise for future research: the analysis of small-scale pressure fluctuations in the circuit, and real-time imaging of the oxygenator. It is concluded that the current methods of detecting blood clots cannot reliably predict clot volume, and their inability to predict clot location puts patients at risk of thromboembolism. It is posited that a more in-depth analysis of pressure readings using machine learning could better provide this information, and that purpose-built imaging could allow for accurate, real-time clotting analysis in ECMO components.
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Affiliation(s)
- Jack Leerson
- Department is Manufacturing, Materials and Mechatronics Engineering, School of Engineering, RMIT University, Melbourne, Victoria, Australia
- Department of Manufacturing, CSIRO, Research Way, Clayton, Victoria, Australia
| | - Andrew Tulloh
- Department of Manufacturing, CSIRO, Research Way, Clayton, Victoria, Australia
| | - Francisco Tovar Lopez
- Department is Manufacturing, Materials and Mechatronics Engineering, School of Engineering, RMIT University, Melbourne, Victoria, Australia
| | - Shaun Gregory
- Department of Mechanical and Aerospace Engineering, Cardiorespiratory Engineering and Technology Laboratory, Monash University, Melbourne, Victoria, Australia
| | - Hergen Buscher
- Department of Intensive Care Medicine, St Vincent's Hospital, Sydney, Australia
| | - Gary Rosengarten
- Department is Manufacturing, Materials and Mechatronics Engineering, School of Engineering, RMIT University, Melbourne, Victoria, Australia
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Sahin C, Giraud A, Jabrah D, Patil S, Messina P, Bozsak F, Darcourt J, Sacchetti F, Januel AC, Bellanger G, Pagola J, Juega J, Imamura H, Ohta T, Spelle L, Chalumeau V, Mircic U, Stanarčević P, Vukašinović I, Ribo M, Sakai N, Cognard C, Doyle K. Electrical impedance measurements can identify red blood cell-rich content in acute ischemic stroke clots ex vivo associated with first-pass successful recanalization. Res Pract Thromb Haemost 2024; 8:102373. [PMID: 38617048 PMCID: PMC11015511 DOI: 10.1016/j.rpth.2024.102373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Accepted: 03/07/2024] [Indexed: 04/16/2024] Open
Abstract
Background Electrochemical impedance spectroscopy can determine characteristics such as cell density, size, and shape. The development of an electrical impedance-based medical device to estimate acute ischemic stroke (AIS) clot characteristics could improve stroke patient outcomes by informing clinical decision making. Objectives To assess how well electrical impedance combined with machine learning identified red blood cell (RBC)-rich composition of AIS clots ex vivo, which is associated with a successfully modified first-pass effect. Methods A total of 253 clots from 231 patients who underwent thrombectomy in 5 hospitals in France, Japan, Serbia, and Spain between February 2021 and October 2023 were analyzed in the Clotbase International Registry. Electrical impedance measurements were taken following clot retrieval by thrombectomy, followed by Martius Scarlet Blue staining. The clot components were quantified via Orbit Image Analysis, and RBC percentages were correlated with the RBC estimations made by the electrical impedance machine learning model. Results Quantification by Martius Scarlet Blue staining identified RBCs as the major component in clots (RBCs, 37.6%; white blood cells, 5.7%; fibrin, 25.5%; platelets/other, 30.3%; and collagen, 1%). The impedance-based RBC estimation correlated well with the RBC content determined by histology, with a slope of 0.9 and Spearman's correlation of r = 0.7. Clots removed in 1 pass were significantly richer in RBCs and clots with successful recanalization in 1 pass (modified first-pass effect) were richer in RBCs as assessed using histology and impedance signature. Conclusion Electrical impedance estimations of RBC content in AIS clots are consistent with histologic findings and may have potential for clinically relevant parameters.
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Affiliation(s)
- Cansu Sahin
- Department of Physiology, University of Galway, Galway, Ireland
- Centre for Research in Medical Devices (CÚRAM)- Science Foundation Ireland (SFI), University of Galway, Galway, Ireland
| | | | - Duaa Jabrah
- Department of Physiology, University of Galway, Galway, Ireland
| | - Smita Patil
- Department of Physiology, University of Galway, Galway, Ireland
- Centre for Research in Medical Devices (CÚRAM)- Science Foundation Ireland (SFI), University of Galway, Galway, Ireland
| | | | | | - Jean Darcourt
- Department of Diagnostic and Therapeutic Neuroradiology, Centre Hospitalier Universitaire (CHU) de Toulouse, Toulouse, France
| | - Federico Sacchetti
- Department of Diagnostic and Therapeutic Neuroradiology, Centre Hospitalier Universitaire (CHU) de Toulouse, Toulouse, France
| | - Anne-Christine Januel
- Department of Diagnostic and Therapeutic Neuroradiology, Centre Hospitalier Universitaire (CHU) de Toulouse, Toulouse, France
| | - Guillaume Bellanger
- Department of Diagnostic and Therapeutic Neuroradiology, Centre Hospitalier Universitaire (CHU) de Toulouse, Toulouse, France
| | - Jorge Pagola
- Department of Neurology, University Hospital Vall d’Hebron, Barcelona, Spain
| | - Jesus Juega
- Department of Neurology, University Hospital Vall d’Hebron, Barcelona, Spain
| | - Hirotoshi Imamura
- Department of Neurosurgery, Kobe City Medical Center General Hospital, Kobe, Japan
| | - Tsuyoshi Ohta
- Department of Neurosurgery, Kobe City Medical Center General Hospital, Kobe, Japan
| | - Laurent Spelle
- Department of Interventional Neuroradiology, Bicêtre Hospital, Le Kremlin-Bicêtre, France
| | - Vanessa Chalumeau
- Department of Interventional Neuroradiology, Bicêtre Hospital, Le Kremlin-Bicêtre, France
| | - Uros Mircic
- Department of Neuroradiology, Centre for Radiology and Magnetic Resonance Imaging (MRI), University Clinical Center of Serbia, Belgrade, Serbia
| | | | - Ivan Vukašinović
- Department of Neuroradiology, Centre for Radiology and Magnetic Resonance Imaging (MRI), University Clinical Center of Serbia, Belgrade, Serbia
| | - Marc Ribo
- Department of Neurology, University Hospital Vall d’Hebron, Barcelona, Spain
| | - Nobuyuki Sakai
- Department of Neurosurgery, Kobe City Medical Center General Hospital, Kobe, Japan
| | - Christophe Cognard
- Department of Diagnostic and Therapeutic Neuroradiology, Centre Hospitalier Universitaire (CHU) de Toulouse, Toulouse, France
| | - Karen Doyle
- Department of Physiology, University of Galway, Galway, Ireland
- Centre for Research in Medical Devices (CÚRAM)- Science Foundation Ireland (SFI), University of Galway, Galway, Ireland
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Sun S, Ma Q, Sheng Q, Huang S, Wu C, Liu J, Xu J. Amyloid-β Oligomer-Induced Electrophysiological Mechanisms and Electrical Impedance Changes in Neurons. SENSORS (BASEL, SWITZERLAND) 2024; 24:1211. [PMID: 38400369 PMCID: PMC10892449 DOI: 10.3390/s24041211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 02/04/2024] [Accepted: 02/10/2024] [Indexed: 02/25/2024]
Abstract
Amyloid plays a critical role in the pathogenesis of Alzheimer's disease (AD) and can aggregate to form oligomers and fibrils in the brain. There is increasing evidence that highly toxic amyloid-β oligomers (AβOs) lead to tau protein aggregation, hyperphosphorylation, neuroinflammation, neuronal loss, synaptic loss, and dysfunction. Although the effects of AβOs on neurons have been investigated using conventional biochemical experiments, there are no established criteria for electrical evaluation. To this end, we explored electrophysiological changes in mouse hippocampal neurons (HT22) following exposure to AβOs and/or naringenin (Nar, a flavonoid compound) using electrical impedance spectroscopy (EIS). AβO-induced HT22 showed a decreased impedance amplitude and increased phase angle, and the addition of Nar reversed these changes. The characteristic frequency was markedly increased with AβO exposure, which was also reversed by Nar. The AβOs decreased intranuclear and cytoplasmic resistance and increased nucleus resistance and extracellular capacitance. Overall, the innovative construction of the eight-element CPE-equivalent circuit model further reflects that the pseudo-capacitance of the cell membrane and cell nucleus was increased in the AβO-induced group. This study conclusively revealed that AβOs induce cytotoxic effects by disrupting the resistance characteristics of unit membranes. The results further support that EIS is an effective technique for evaluating AβO-induced neuronal damage and microscopic electrical distinctions in the sub-microscopic structure of reactive cells.
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Affiliation(s)
- Shimeng Sun
- Department of Physiology and Pharmacology, Health Science Center, Ningbo University, Ningbo 315211, China; (S.S.); (Q.M.); (Q.S.); (S.H.); (C.W.)
| | - Qing Ma
- Department of Physiology and Pharmacology, Health Science Center, Ningbo University, Ningbo 315211, China; (S.S.); (Q.M.); (Q.S.); (S.H.); (C.W.)
| | - Qiyu Sheng
- Department of Physiology and Pharmacology, Health Science Center, Ningbo University, Ningbo 315211, China; (S.S.); (Q.M.); (Q.S.); (S.H.); (C.W.)
| | - Shangwei Huang
- Department of Physiology and Pharmacology, Health Science Center, Ningbo University, Ningbo 315211, China; (S.S.); (Q.M.); (Q.S.); (S.H.); (C.W.)
| | - Chenxia Wu
- Department of Physiology and Pharmacology, Health Science Center, Ningbo University, Ningbo 315211, China; (S.S.); (Q.M.); (Q.S.); (S.H.); (C.W.)
| | - Junsong Liu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Jia Xu
- Department of Physiology and Pharmacology, Health Science Center, Ningbo University, Ningbo 315211, China; (S.S.); (Q.M.); (Q.S.); (S.H.); (C.W.)
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Hoare D, Kingsmore D, Holsgrove M, Russell E, Kirimi MT, Czyzewski J, Mirzai N, Kennedy S, Neale SL, Mercer JR. Realtime monitoring of thrombus formation in vivo using a self-reporting vascular access graft. COMMUNICATIONS MEDICINE 2024; 4:15. [PMID: 38316912 PMCID: PMC10844314 DOI: 10.1038/s43856-024-00436-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Accepted: 01/10/2024] [Indexed: 02/07/2024] Open
Abstract
BACKGROUND Chronic kidney disease (CKD) affects 10% of the global population costing over a hundred billion dollars per annum and leading to increased risk of cardiovascular disease. Many patients with CKD require regular haemodialyses. Synthetic arteriovenous grafts (AVG) are increasingly used to provide rapid vascular connection for dialysis. Initially, they have excellent patency rates but are critically limited by neointimal hyperplasia at the venous anastomosis, which drives subsequent thrombosis, graft failure and death. METHODS Here, we describe a system in which electrical impedance spectroscopy sensors are incorporated circumferentially into the wall of a synthetic arteriovenous graft. This is combined with an implantable radiotelemetry system for data transmission outside the patient. The system was tested using monolayers of endothelial and smooth muscle cells as well as swine blood and clots with explanted human carotid artery plaques. Sensor testing was then performed in vitro and the device was implanted in vivo in female swine. RESULTS The device can wirelessly report the accumulation of biological material, both cells and blood. Differences are also detected when comparing controls with pathological atheroma. In swine differences between blockage formation in a graft were remotely obtained and wireless reported. CONCLUSIONS Combining electrical impedance spectroscopy and an implantable radiotelemetry system enables graft surveillance. This has the potential to be used for early detection of venous stenosis and blood clot formation in real-time in vivo. In principle, the concept could apply to other cardiovascular diseases and vascular implantable devices.
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Affiliation(s)
- Daniel Hoare
- School of Cardiovascular & Metabolic Health, University of Glasgow, Glasgow, UK
| | - David Kingsmore
- Queen Elizabeth University Hospital, University of Glasgow, Glasgow, UK
| | - Michael Holsgrove
- Bioelectronics Unit, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Ewan Russell
- Bioelectronics Unit, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Mahmut T Kirimi
- Queen Elizabeth University Hospital, University of Glasgow, Glasgow, UK
| | - Jakub Czyzewski
- Bioelectronics Unit, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Nosrat Mirzai
- Bioelectronics Unit, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Simon Kennedy
- School of Cardiovascular & Metabolic Health, University of Glasgow, Glasgow, UK
| | - Steven L Neale
- Centre for Medical and Industrial Ultrasonics, James Watt School of Engineering, University of Glasgow, Glasgow, UK
| | - John R Mercer
- School of Cardiovascular & Metabolic Health, University of Glasgow, Glasgow, UK.
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Huang Y, Li LC, Li YX, Gui C, Yang LH. Development and validation of a risk model for intracardiac thrombosis in patients with dilated cardiomyopathy: a retrospective study. Sci Rep 2024; 14:1431. [PMID: 38228722 PMCID: PMC10791606 DOI: 10.1038/s41598-024-51745-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 01/09/2024] [Indexed: 01/18/2024] Open
Abstract
Intracardiac thrombosis is a severe complication in patients with non-ischemic dilated cardiomyopathy. This study aims to develop and validate an individualized nomogram to evaluate the risk of intracardiac thrombosis in patients with non-ischemic dilated cardiomyopathy. This retrospective study included patients diagnosed with dilated cardiomyopathy at first admission. Clinical baseline characteristics were acquired from electronic medical record systems. Multiple methods were applied to screen the key variables and generate multiple different variable combinations. Multivariable logistic regression was used to build the models, and the optimal model was chosen by comparing the discrimination. Then we checked the performance of the model in different thrombus subgroups. Finally, the model was presented using a nomogram and evaluated from the perspectives of discrimination, calibration, and clinical usefulness. Internal validation was performed by extracting different proportions of data for Bootstrapping. Ultimately, 564 eligible patients were enrolled, 67 of whom developed an intracardiac thrombosis. Risk factors included d-dimer, white blood cell count, high-sensitivity C-reactive protein, pulse pressure, history of stroke, hematocrit, and NT-proBNP in the optimal model. The model had good discrimination and calibration, and the area under the curve (AUC) was 0.833 (0.782-0.884), and the model's performance in each subgroup was stable. Clinical decision curve analysis showed that the model had clinical application value when the high-risk threshold was between 2% and 78%. The AUC of interval validation (30% and 70% data resampling) was 0.844 (0.765-0.924) and 0.833 (0.775-0.891), respectively. This novel intracardiac thrombosis nomogram could be conveniently applied to facilitate the individual intracardiac thrombosis risk assessment in patients with non-ischemic dilated cardiomyopathy.
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Affiliation(s)
- Yuan Huang
- Department of Cardiology, Jiangbin Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi, China
| | - Long-Chang Li
- Department of Cardiology, The First People's Hospital of Nanning, The Fifth Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
| | - Yu-Xin Li
- Department of Cardiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, Guangxi, China
- Guangxi Key Laboratory Base of Precision Medicine in Cardio-Cerebrovascular Diseases Control and Prevention, Nanning, 530021, Guangxi, China
- Guangxi Clinical Research Center for Cardio-Cerebrovascular Diseases, Nanning, 530021, Guangxi, China
| | - Chun Gui
- Department of Cardiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, Guangxi, China.
- Guangxi Key Laboratory Base of Precision Medicine in Cardio-Cerebrovascular Diseases Control and Prevention, Nanning, 530021, Guangxi, China.
- Guangxi Clinical Research Center for Cardio-Cerebrovascular Diseases, Nanning, 530021, Guangxi, China.
| | - Li-Hua Yang
- Department of Cardiology, Jiangbin Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi, China.
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Pourang S, Sekhon UDS, Disharoon D, Ahuja SP, Suster MA, Sen Gupta A, Mohseni P. Assessment of fibrinolytic status in whole blood using a dielectric coagulometry microsensor. Biosens Bioelectron 2022; 210:114299. [PMID: 35533507 PMCID: PMC10124761 DOI: 10.1016/j.bios.2022.114299] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 04/12/2022] [Accepted: 04/19/2022] [Indexed: 02/09/2023]
Abstract
Rapid assessment of the fibrinolytic status in whole blood at the point-of-care/point-of-injury (POC/POI) is clinically important to guide timely management of uncontrolled bleeding in patients suffering from hyperfibrinolysis after a traumatic injury. In this work, we present a three-dimensional, parallel-plate, capacitive sensor - termed ClotChip - that measures the temporal variation in the real part of blood dielectric permittivity at 1 MHz as the sample undergoes coagulation within a microfluidic channel with <10 μL of total volume. The ClotChip sensor features two distinct readout parameters, namely, lysis time (LT) and maximum lysis rate (MLR) that are shown to be sensitive to the fibrinolytic status in whole blood. Specifically, LT identifies the time that it takes from the onset of coagulation for the fibrin clot to mostly dissolve in the blood sample during fibrinolysis, whereas MLR captures the rate of fibrin clot lysis. Our findings are validated through correlative measurements with a rotational thromboelastometry (ROTEM) assay of clot viscoelasticity, qualitative/quantitative assessments of clot stability, and scanning electron microscope imaging of clot ultrastructural changes, all in a tissue plasminogen activator (tPA)-induced fibrinolytic environment. Moreover, we demonstrate the ClotChip sensor ability to detect the hemostatic rescue that occurs when the tPA-induced upregulated fibrinolysis is inhibited by addition of tranexamic acid (TXA) - a potent antifibrinolytic drug. This work demonstrates the potential of ClotChip as a diagnostic platform for rapid POC/POI assessment of fibrinolysis-related hemostatic abnormalities in whole blood to guide therapy.
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Affiliation(s)
- Sina Pourang
- Department of Electrical, Computer, and Systems Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Ujjal D S Sekhon
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Dante Disharoon
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Sanjay P Ahuja
- Division of Pediatric Hematology/Oncology, Rainbow Babies and Children's Hospital, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Michael A Suster
- Department of Electrical, Computer, and Systems Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Anirban Sen Gupta
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA.
| | - Pedram Mohseni
- Department of Electrical, Computer, and Systems Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA; Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA.
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Bai X, Liu D, Wei J, Bai X, Sun S, Tian W. Simultaneous Imaging of Bio- and Non-Conductive Targets by Combining Frequency and Time Difference Imaging Methods in Electrical Impedance Tomography. BIOSENSORS 2021; 11:bios11060176. [PMID: 34072777 PMCID: PMC8226516 DOI: 10.3390/bios11060176] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 05/20/2021] [Accepted: 05/28/2021] [Indexed: 06/12/2023]
Abstract
As a promising medical imaging modality, electrical impedance tomography (EIT) can image the electrical properties within a region of interest using electrical measurements applied at electrodes on the region boundary. This paper proposes to combine frequency and time difference imaging methods in EIT to simultaneously image bio- and non-conductive targets, where the image fusion is accomplished by applying a wavelet-based technique. To enable image fusion, both time and frequency difference imaging methods are investigated regarding the reconstruction of bio- or non-conductive inclusions in the target region at varied excitation frequencies, indicating that none of those two methods can tackle with the scenarios where both bio- and non-conductive inclusions exist. This dilemma can be resolved by fusing the time difference (td) and appropriate frequency difference (fd) EIT images since they are complementary to each other. Through simulation and in vitro experiment, it is demonstrated that the proposed fusion method can reasonably reconstruct both the bio- and non-conductive inclusions within the lung models established to simulate the ventilation process, which is expected to be beneficial for the diagnosis of lung-tissue related diseases by EIT.
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Affiliation(s)
- Xue Bai
- School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China; (X.B.); (J.W.); (X.B.); (S.S.)
| | - Dun Liu
- Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University, Beijing 100191, China
| | - Jinzhao Wei
- School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China; (X.B.); (J.W.); (X.B.); (S.S.)
| | - Xu Bai
- School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China; (X.B.); (J.W.); (X.B.); (S.S.)
| | - Shijie Sun
- School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China; (X.B.); (J.W.); (X.B.); (S.S.)
- Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University, Beijing 100191, China
| | - Wenbin Tian
- College of Engineering, China Agricultural University, Beijing 100083, China;
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Bao H, Li J, Wen J, Cheng L, Hu Y, Zhang Y, Wan N, Takei M. Quantitative Evaluation of Burn Injuries Based on Electrical Impedance Spectroscopy of Blood with a Seven-Parameter Equivalent Circuit. SENSORS 2021; 21:s21041496. [PMID: 33670072 PMCID: PMC7926917 DOI: 10.3390/s21041496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 02/17/2021] [Accepted: 02/17/2021] [Indexed: 11/16/2022]
Abstract
A quantitative and rapid burn injury detection method has been proposed based on the electrical impedance spectroscopy (EIS) of blood with a seven-parameter equivalent circuit. The degree of burn injury is estimated from the electrical impedance characteristics of blood with different volume proportions of red blood cells (RBCs) and heated red blood cells (HRBCs). A quantitative relationship between the volume portion HHCT of HRBCs and the electrical impedance characteristics of blood has been demonstrated. A seven -parameter equivalent circuit is employed to quantify the relationship from the perspective of electricity. Additionally, the traditional Hanai equation has been modified to verify the experimental results. Results show that the imaginary part of impedance ZImt under the characteristic frequency (fc) has a linear relationship with HHCT which could be described by ZImt = −2.56HHCT − 2.01 with a correlation coefficient of 0.96. Moreover, the relationship between the plasma resistance Rp and HHCT is obtained as Rp = −7.2HHCT + 3.91 with a correlation coefficient of 0.96 from the seven -parameter equivalent circuit. This study shows the feasibility of EIS in the quantitative detection of burn injury by the quantitative parameters ZImt and Rp, which might be meaningful for the follow-up clinical treatment for burn injury.
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Affiliation(s)
- Huilu Bao
- The Institute of Precision Machinery and Smart Structure, College of Engineering, Zhejiang Normal University, Jinhua 321004, China; (H.B.); (J.W.); (L.C.); (Y.H.); (Y.Z.); (N.W.)
| | - Jianping Li
- The Institute of Precision Machinery and Smart Structure, College of Engineering, Zhejiang Normal University, Jinhua 321004, China; (H.B.); (J.W.); (L.C.); (Y.H.); (Y.Z.); (N.W.)
- Correspondence:
| | - Jianming Wen
- The Institute of Precision Machinery and Smart Structure, College of Engineering, Zhejiang Normal University, Jinhua 321004, China; (H.B.); (J.W.); (L.C.); (Y.H.); (Y.Z.); (N.W.)
| | - Li Cheng
- The Institute of Precision Machinery and Smart Structure, College of Engineering, Zhejiang Normal University, Jinhua 321004, China; (H.B.); (J.W.); (L.C.); (Y.H.); (Y.Z.); (N.W.)
| | - Yili Hu
- The Institute of Precision Machinery and Smart Structure, College of Engineering, Zhejiang Normal University, Jinhua 321004, China; (H.B.); (J.W.); (L.C.); (Y.H.); (Y.Z.); (N.W.)
| | - Yu Zhang
- The Institute of Precision Machinery and Smart Structure, College of Engineering, Zhejiang Normal University, Jinhua 321004, China; (H.B.); (J.W.); (L.C.); (Y.H.); (Y.Z.); (N.W.)
| | - Nen Wan
- The Institute of Precision Machinery and Smart Structure, College of Engineering, Zhejiang Normal University, Jinhua 321004, China; (H.B.); (J.W.); (L.C.); (Y.H.); (Y.Z.); (N.W.)
| | - Masahiro Takei
- Graduate School of Mechanical Engineering, Division of Artificial System Science, Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522, Japan;
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Santorelli A, Fitzgerald S, Douglas A, Doyle K, O'Halloran M. Dielectric profile of blood clots to inform ischemic stroke treatments. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2020; 2020:3723-3726. [PMID: 33018810 DOI: 10.1109/embc44109.2020.9175387] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Platelet and fibrin-rich blood clots can respond differently to red blood cell rich clots during ischemic stroke treatment, which includes thrombolysis and mechanical thrombectomy. Currently, there is no accurate way to identify the type of clot in advance of treatment. If the type of blood clot can be identified, the optimum clot removal process can be chosen and patient outcomes can be improved. In this paper we fabricate physiologically relevant blood clot analogues from human blood, that cover a range of red blood cell, fibrin, and platelet concentrations. We characterize the dielectric profile of these formed clots using an open-ended coaxial probe method across a wide frequency range. After the dielectric measurements are completed, histology on each blood clot is performed to determine the concentration of red blood cells present. In total, 32 unique blood clots were measured.With this completed analysis, we investigate the correlation between the dielectric properties across this frequency range and the red blood cell count of the formed blood clots. Furthermore, we develop a model to predict whether an unknown blood clot can be categorized as red blood cell rich or platelet and fibrin-rich based solely on the measured dielectric properties.Clinical Relevance-Using the dielectric profile of a clot we can predict whether a clot is platelet and fibrin-rich or red blood cell rich allowing clinicians to more easily determine treatment methods during an intervention for ischemic stroke.
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