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Tahergorabi Z, Lotfi H, Rezaei M, Aftabi M, Moodi M. Crosstalk between obesity and cancer: a role for adipokines. Arch Physiol Biochem 2024; 130:155-168. [PMID: 34644215 DOI: 10.1080/13813455.2021.1988110] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 09/15/2021] [Accepted: 09/27/2021] [Indexed: 10/20/2022]
Abstract
Adipose tissue is a complex organ that is increasingly being recognised as the largest endocrine organ in the body. Adipocytes among multiple cell types of adipose tissue can secrete a variety of adipokines, which are involved in signalling pathways and these can be changed by obesity and cancer. There are proposed mechanisms to link obesity/adiposity to cancer development including adipocytokine dysregulation. Among these adipokines, leptin acts through multiple pathways including the STAT3, MAPK, and PI3K pathways involved in cell growth. Adiponectin has the opposite action from leptin in tumour growth partly because of increased apoptotic responses of p53 and Bax. Visfatin increases cancer cell proliferation through ERK1/2, PI3K/AKT, and p38 which are stimulated by proinflammatory cytokines. Omentin through the PI3K/Akt-Nos pathway is involved in cancer-tumour development. Apelin might be involved through angiogenesis in tumour progressions. PAI-1 via its anti-fibrinolytic activity on cell adhesion and uPA/uPAR activity influence cancer cell growth.
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Affiliation(s)
- Zoya Tahergorabi
- Medical Toxicology and Drug Abuse Research Center (MTDRC), Department of Physiology, Birjand University of Medical Sciences, Birjand, Iran
| | - Hamed Lotfi
- Khatamolanbia Hospital, Iranshahr University of Medical Sciences, Iranshahr, Iran
| | - Maryam Rezaei
- Medical Toxicology and Drug Abuse Research Center (MTDRC), Department of Internal Medicine, Birjand University of Medical Sciences, Birjand, Iran
| | - Mohammad Aftabi
- Faculty of Nursing and Midwifery, Birjand University of Medical Sciences, Birjand, Iran
| | - Mitra Moodi
- Social Determinants of Health Research Center, Department of Health Promotion and Education, School of Health, Birjand University of Medical Sciences, Birjand, Iran
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2
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Simić M, Freeborn TJ, Šekara TB, Stavrakis AK, Jeoti V, Stojanović GM. A novel method for in-situ extracting bio-impedance model parameters optimized for embedded hardware. Sci Rep 2023; 13:5070. [PMID: 36977800 PMCID: PMC10050187 DOI: 10.1038/s41598-023-31860-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Accepted: 03/20/2023] [Indexed: 03/30/2023] Open
Abstract
A novel method for embedded hardware-based parameter estimation of the Cole model of bioimpedance is developed and presented. The model parameters R∞, R1 and C are estimated using the derived set of equations based on measured values of real (R) and imaginary part (X) of bioimpedance, as well as the numerical approximation of the first derivative of quotient R/X with respect to angular frequency. The optimal value for parameter α is estimated using a brute force method. The estimation accuracy of the proposed method is very similar with the relevant work from the existing literature. Moreover, performance evaluation was performed using the MATLAB software installed on a laptop, as well as on the three embedded-hardware platforms (Arduino Mega2560, Raspberry Pi Pico and XIAO SAMD21). Obtained results showed that the used platforms can perform reliable bioimpedance processing with the same accuracy, while Raspberry Pi Pico is the fastest solution with the smallest energy consumption.
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Affiliation(s)
- Mitar Simić
- Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovića 6, 21000, Novi Sad, Serbia.
| | - Todd J Freeborn
- Department of Electrical and Computer Engineering, The University of Alabama, Box 870286, Tuscaloosa, AL, 35487, USA
| | - Tomislav B Šekara
- School of Electrical Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11120, Belgrade, Serbia
| | - Adrian K Stavrakis
- Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovića 6, 21000, Novi Sad, Serbia
| | - Varun Jeoti
- Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovića 6, 21000, Novi Sad, Serbia
| | - Goran M Stojanović
- Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovića 6, 21000, Novi Sad, Serbia
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3
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Whelton E, Helen L, O’Donnell B, O’Sullivan M, Ugwah J, Messina W, Wang Y, O’Mahoney N, Moore E. Smart needle electrical bioimpedance to provide information on needle tip relationship to target nerve prior to local anesthetic deposition in peripheral nerve block (USgPNB) procedures. JOURNAL OF ELECTRICAL BIOIMPEDANCE 2023; 14:53-59. [PMID: 38162814 PMCID: PMC10750317 DOI: 10.2478/joeb-2023-0007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Indexed: 01/03/2024]
Abstract
Ultrasound guided peripheral nerve block (USgPNB) refers to anaesthetic techniques to deposit local anesthetic next to nerves, permitting painful surgery without necessitating general anesthesia. Needle tip position prior to local anesthetic deposition is a key determinant of block success and safety. Nerve puncture and intra-neural injection of local anesthetic can cause permanent nerve injury. Currently ultrasound guidance is not sufficiently sensitive to reliably detect needle to nerve proximity. Feedback with bioimpedance data from the smart needle tip might provide the anesthetist with information as to the relationship between the needle tip and the target nerve prior to local anesthetic deposition. Bioimpedance using a smart needle integrated with a two-electrode impedance sensor has been developed to determine needle to nerve proximity during USgPNB. Having obtained all necessary ethical and regulatory approvals, in vivo data on brachial plexus, vagus, femoral and sciatic nerves were obtained from seven pig models using the smart needle bioimpedance system. The excision and histological analysis of above peripheral nerves and observation of the architecture and structure of nerves by means of histology allow the calculation of the ratios of connective tissue to neural tissue to determine the influence of this variable on absolute impedance. The ratio results give extra clinical data and explain the hetrogeneity of impedance data in the pig models and the hypothesis that connective tissue with intra-neural fat has higher impedance than neural tissue.
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Affiliation(s)
- Edel Whelton
- Life Science Interface, Tyndall National Institute, University College, Cork, Ireland
- School of Chemistry, University CollegeCork, Ireland
| | - Lisa Helen
- Life Science Interface, Tyndall National Institute, University College, Cork, Ireland
| | | | | | - Justina Ugwah
- Life Science Interface, Tyndall National Institute, University College, Cork, Ireland
- School of Chemistry, University CollegeCork, Ireland
| | - Walter Messina
- Life Science Interface, Tyndall National Institute, University College, Cork, Ireland
| | - Yineng Wang
- Life Science Interface, Tyndall National Institute, University College, Cork, Ireland
| | | | - Eric Moore
- Life Science Interface, Tyndall National Institute, University College, Cork, Ireland
- School of Chemistry, University CollegeCork, Ireland
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4
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Yilmaz G, Braun F, Adler A, De Sousa AM, Ferrario D, Lemay M, Chetelat O. Split electrodes for electrical-conductivity-based tissue discrimination. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2022; 2022:1266-1269. [PMID: 36085975 DOI: 10.1109/embc48229.2022.9871552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
This work presents a method to minimize the inadvertent cutting of tissues in surgeries involving bone drilling. We present electrical impedance measurements as an assistive technology to image-guided surgery to achieve online guidance. Proposed concept is to identify and localize the landmarks via impedance measurements and then use this information to superimpose the estimated drilling trajectory on the offline maps obtained by pre-operative imaging. To this end., we propose an asymmetric electrode geometry., split electrodes., capable of distinguishing impedance variations as a function of rotation angle. The feasibility of the proposed approach is verified with numerical analysis. A probe with stainless steel electrodes has been fabricated and tested with a technical phantom. Although the results are impacted by a non-ideality in the phantom., we could show that the variation of impedance as a function of rotation angle can be used to localize the regions with different impedivities. Clinical Relevance- Presented approach may be used to minimize the inadvertent cutting of tissues in surgeries involving bone drilling.
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Su B, Yu S, Yan H, Hu YD, Buzurovic I, Liu D, Liu L, Teng Y, Tang J, Wang J, Liu W. Biopsy Needle System With a Steerable Concentric Tube and Online Monitoring of Electrical Resistivity and Insertion Forces. IEEE Trans Biomed Eng 2021; 68:1702-1713. [PMID: 33606624 DOI: 10.1109/tbme.2021.3060541] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
OBJECTIVE Biopsies are the gold standard for clinical diagnosis. However, a discrepancy between the biopsy sample and target tissue because of misplacement of the biopsy spoon can lead to errors in the diagnosis and subsequent treatment. Thus, correctly determining whether the needle tip is in the tumor is crucial for accurate biopsy results. METHODS A biopsy needle system was designed with a steerable, flexible, and superelastic concentric tube; electrodes to monitor the electrical resistivity; and load cells to monitor the insertion force. The degrees of freedom were analyzed for two working modes: straight-line and deflection. RESULTS Experimental results showed that the system could perceive the tissue type in online based on the electrical resistivity. In addition, changes in the insertion force indicated transitions between the interfaces of adjacent tissue layers. CONCLUSION The two monitoring methods guarantee that the biopsy spoon is at the desired position inside the tumor during an operation. SIGNIFICANCE The proposed biopsy needle system can be integrated into an autonomous robotic biopsy system.
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6
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Gadsden JC. The role of peripheral nerve stimulation in the era of ultrasound-guided regional anaesthesia. Anaesthesia 2021; 76 Suppl 1:65-73. [PMID: 33426665 DOI: 10.1111/anae.15257] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/21/2020] [Indexed: 11/28/2022]
Abstract
With the widespread use of ultrasound for localising nerves during peripheral nerve blockade, the value of electrical nerve stimulation of evoked motor responses has been questioned. Studies continue to show that, compared with nerve stimulation, ultrasound guidance alone leads to: significantly improved block success; decreased need for rescue analgesia; decreased procedural pain; and lower rates of vascular puncture. Nerve stimulation combined with ultrasound does also not appear to improve block success rates, apart from those blocks where the nerves are challenging to view, such as the obturator nerve. The role of nerve stimulation has changed in the last 15 years from a technique to locate nerves to that of an adjunct to ultrasound. Nerve stimulation can serve as a monitor against needle-nerve contact and may be useful in avoiding nerves that are in the needle trajectory during specific ultrasound guided techniques. Nerve stimulation is also a useful adjunct in teaching novices ultrasound-guided regional anaesthesia, especially when the position and or appearance of nerves may be variable. In this review, the changing role of nerve stimulation in contemporary regional anaesthetic practice is presented and discussed.
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Affiliation(s)
- J C Gadsden
- Department of Anaesthesiology, Duke University, Durham, NC, USA
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7
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McLeod GA. Novel approaches to needle tracking and visualisation. Anaesthesia 2021; 76 Suppl 1:160-170. [PMID: 33426657 DOI: 10.1111/anae.15232] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/17/2020] [Indexed: 12/22/2022]
Abstract
The accuracy and reliability of ultrasound are still insufficient to guarantee complete and safe nerve block for all patients. Injection of local anaesthetic close to, but not touching, the nerve is key to outcomes, but the exact relationship between the needle tip and nerve epineurium is difficult to evaluate, even with ultrasound. Ultrasound has insufficient resolution, tissues are difficult to discern due to acoustic impedance and needles are more difficult to see with increased angulation. The limitations of ultrasound have shifted the focus of innovation towards bio-markers that help detect needle tip position by utilising the physical properties of tissues, (e.g. pressure, electrical, optics, acoustic and elastic). Although most are at the laboratory stage and results are as yet only available from phantom or cadaver studies, clinical trials are imminent. For example, fine optical fibres placed within the lumen of block needles can measure needle tip pressure. Electrical impedance differentiates between intraneural and perineural needle tip placement. A new tip tracker needle has a piezo element embedded at its distal end that tracks the needle tip in-plane and out-of-plane as a blue/red or green circle depending on its relative location within the beam. Micro-ultrasound at the tip of the needle is in development. Early images using 40MHz in anaesthetised pigs reveal muscle striation, distinct epineurium and 30-40 fascicles > 75 micron in diameter. The next few years will see a technological revolution in tip-tracking technology that has the potential to improve patient safety and, in doing so, change practice.
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Affiliation(s)
- G A McLeod
- Ninewells Hospital, Dundee, UK.,Institute of Academic Anaesthesia, University of Dundee, UK.,University of East Anglia, Norwich, UK
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Cheng Z, Carobbio ALC, Soggiu L, Migliorini M, Guastini L, Mora F, Fragale M, Ascoli A, Africano S, Caldwell DG, Canevari FRM, Parrinello G, Peretti G, Mattos LS. SmartProbe: a bioimpedance sensing system for head and neck cancer tissue detection. Physiol Meas 2020; 41:054003. [PMID: 32325435 DOI: 10.1088/1361-6579/ab8cb4] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
OBJECTIVES This study presents SmartProbe, an electrical bioimpedance (EBI) sensing system based on a concentric needle electrode (CNE). The system allows the use of commercial CNEs for accurate EBI measurement, and was specially developed for in-vivo real-time cancer detection. APPROACH Considering the uncertainties in EBI measurements due to the CNE manufacturing tolerances, we propose a calibration method based on statistical learning. This is done by extracting the correlation between the measured impedance value |Z|, and the material conductivity σ, for a group of reference materials. By utilizing this correlation, the relationship of σ and |Z| can be described as a function and reconstructed using a single measurement on a reference material of known conductivity. MAIN RESULTS This method simplifies the calibration process, and is verified experimentally. Its effectiveness is demonstrate by results that show less than 6% relative error. An additional experiment is conducted for evaluating the system's capability to detect cancerous tissue. Four types of ex-vivo human tissue from the head and neck region, including mucosa, muscle, cartilage and salivary gland, are characterized using SmartProbe. The measurements include both cancer and surrounding healthy tissue excised from 10 different patients operated on for head and neck cancer. The measured data is then processed using dimension reduction and analyzed for tissue classification. The final results show significant differences between pathologic and healthy tissues in muscle, mucosa and cartilage specimens. SIGNIFICANCE These results are highly promising and indicate a great potential for SmartProbe to be used in various cancer detection tasks.
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Affiliation(s)
- Zhuoqi Cheng
- Department of Advanced Robotics, Istituto Italiano di Tecnologia, Genova, Italy
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9
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Zorena K, Jachimowicz-Duda O, Ślęzak D, Robakowska M, Mrugacz M. Adipokines and Obesity. Potential Link to Metabolic Disorders and Chronic Complications. Int J Mol Sci 2020; 21:E3570. [PMID: 32443588 PMCID: PMC7278967 DOI: 10.3390/ijms21103570] [Citation(s) in RCA: 181] [Impact Index Per Article: 45.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/14/2020] [Accepted: 05/15/2020] [Indexed: 12/19/2022] Open
Abstract
The World Health Organization (WHO) has recognized obesity as one of the top ten threats to human health. It is estimated that the number of obese and overweight people worldwide exceeds the number of those who are undernourished. Obesity is not only a state of abnormally increased adipose tissue in the body, but also of increased release of biologically active adipokines. Adipokines released into the circulating blood, due to their specific receptors on the surface of target cells, act as classic hormones affecting the metabolism of tissues and organs. What is more, adipokines and cytokines may decrease the insulin sensitivity of tissues and induce inflammation and development of chronic complications. Certainly, it can be stated that in an era of a global obesity pandemic, adipokines may gain more and more importance as regards their use in the diagnostic evaluation and treatment of diseases. An extensive search for materials on the role of white, brown and perivascular fatty tissue and obesity-related metabolic and chronic complications was conducted online using PubMed, the Cochrane database and Embase.
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Affiliation(s)
- Katarzyna Zorena
- Department of Immunobiology and Environment Microbiology, Medical University of Gdańsk, Dębinki 7, 80-211 Gdańsk, Poland
| | - Olga Jachimowicz-Duda
- Independent Public Specialized Health Care Center in Lębork, Department of Internal Diseases, Węgrzynowicza 13, 84-300 Lębork, Poland;
| | - Daniel Ślęzak
- Department of Emergency Medicine, Faculty of Health Sciences, Medical University of Gdańsk, Smoluchowskiego 17, 80-214 Gdańsk, Poland;
| | - Marlena Robakowska
- Department of Public Health & Social Medicine, Faculty of Health Sciences, Medical University of Gdańsk, Al. Zwycięctwa 42a, 80-210 Gdańsk, Poland;
| | - Małgorzata Mrugacz
- Department of Ophthalmology and Eye Rehabilitation, Medical University of Bialystok, Kilinskiego 1, 15-089 Białystok, Poland;
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10
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Cheng Z, Dall'Alba D, Foti S, Mariani A, Chupin T, Caldwell DG, Ferrigno G, De Momi E, Mattos LS, Fiorini P. Design and Integration of Electrical Bio-impedance Sensing in Surgical Robotic Tools for Tissue Identification and Display. Front Robot AI 2019; 6:55. [PMID: 33501070 PMCID: PMC7805990 DOI: 10.3389/frobt.2019.00055] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 06/26/2019] [Indexed: 11/16/2022] Open
Abstract
The integration of intra-operative sensors into surgical robots is a hot research topic since this can significantly facilitate complex surgical procedures by enhancing surgical awareness with real-time tissue information. However, currently available intra-operative sensing technologies are mainly based on image processing and force feedback, which normally require heavy computation or complicated hardware modifications of existing surgical tools. This paper presents the design and integration of electrical bio-impedance sensing into a commercial surgical robot tool, leading to the creation of a novel smart instrument that allows the identification of tissues by simply touching them. In addition, an advanced user interface is designed to provide guidance during the use of the system and to allow augmented-reality visualization of the tissue identification results. The proposed system imposes minor hardware modifications to an existing surgical tool, but adds the capability to provide a wealth of data about the tissue being manipulated. This has great potential to allow the surgeon (or an autonomous robotic system) to better understand the surgical environment. To evaluate the system, a series of ex-vivo experiments were conducted. The experimental results demonstrate that the proposed sensing system can successfully identify different tissue types with 100% classification accuracy. In addition, the user interface was shown to effectively and intuitively guide the user to measure the electrical impedance of the target tissue, presenting the identification results as augmented-reality markers for simple and immediate recognition.
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Affiliation(s)
- Zhuoqi Cheng
- Department of Advanced Robotics, Istituto Italiano di Tecnologia, Genova, Italy
| | - Diego Dall'Alba
- Altair Robotic Labs, Department of Computer Science, University of Verona, Verona, Italy
| | - Simone Foti
- NearLab, Electronic Information and Bioengineering Department, Politecnico di Milano, Milan, Italy
| | - Andrea Mariani
- NearLab, Electronic Information and Bioengineering Department, Politecnico di Milano, Milan, Italy
| | - Thibaud Chupin
- NearLab, Electronic Information and Bioengineering Department, Politecnico di Milano, Milan, Italy
| | - Darwin G. Caldwell
- Department of Advanced Robotics, Istituto Italiano di Tecnologia, Genova, Italy
| | - Giancarlo Ferrigno
- NearLab, Electronic Information and Bioengineering Department, Politecnico di Milano, Milan, Italy
| | - Elena De Momi
- NearLab, Electronic Information and Bioengineering Department, Politecnico di Milano, Milan, Italy
| | - Leonardo S. Mattos
- Department of Advanced Robotics, Istituto Italiano di Tecnologia, Genova, Italy
| | - Paolo Fiorini
- Altair Robotic Labs, Department of Computer Science, University of Verona, Verona, Italy
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O'Donnell BD, Loughnane F. Novel nerve imaging and regional anesthesia, bio-impedance and the future. Best Pract Res Clin Anaesthesiol 2019; 33:23-35. [DOI: 10.1016/j.bpa.2019.02.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 02/20/2019] [Accepted: 02/22/2019] [Indexed: 11/24/2022]
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12
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Halonen S, Kari J, Ahonen P, Kronström K, Hyttinen J. Real-Time Bioimpedance-Based Biopsy Needle Can Identify Tissue Type with High Spatial Accuracy. Ann Biomed Eng 2018; 47:836-851. [DOI: 10.1007/s10439-018-02187-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 12/08/2018] [Indexed: 11/29/2022]
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13
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Anso J, Balmer TW, Jegge Y, Kalvoy H, Bell BJ, Dur C, Calvo EM, Williamson TM, Gerber N, Ferrario D, Forterre F, Buchler P, Stahel A, Caversaccio MD, Weber S, Gavaghan KA. Electrical Impedance to Assess Facial Nerve Proximity During Robotic Cochlear Implantation. IEEE Trans Biomed Eng 2018; 66:237-245. [PMID: 29993441 DOI: 10.1109/tbme.2018.2830303] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Reported studies pertaining to needle guidance suggest that tissue impedance available from neuromonitoring systems can be used to discriminate nerve tissue proximity. In this pilot study, the existence of a relationship between intraoperative electrical impedance and tissue density, estimated from computer tomography (CT) images, is evaluated in the mastoid bone of in vivo sheep. In five subjects, nine trajectories were drilled using an image-guided surgical robot. Per trajectory, five measurement points near the facial nerve were accessed and electrical impedance was measured (≤1 KHz) using a multipolar electrode probe. Micro-CT was used postoperatively to measure the distances from the drilled trajectories to the facial nerve. Tissue density was determined from coregistered preoperative CT images and, following sensitivity field modeling of the measuring tip, tissue resistivity was calculated. The relationship between impedance and density was determined for 29 trajectories passing or intersecting the facial nerve. A monotonic decrease in impedance magnitude was observed in all trajectories with a drill axis intersecting the facial nerve. Mean tissue densities intersecting with the facial nerve (971-1161 HU) were different (p <0.01) from those along safe trajectories passing the nerve (1194-1449 HU). However, mean resistivity values of trajectories intersecting the facial nerve (14-24 Ωm) were similar to those of safe passing trajectories (17-23 Ωm). The determined relationship between tissue density and electrical impedance during neuromonitoring of the facial nerve suggests that impedance spectroscopy may be used to increase the accuracy of tissue discrimination, and ultimately improve nerve safety distance assessment in the future.
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14
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Kalvoy H, Tronstad C, Ullensvang K, Steinfeldt T, Sauter AR. Detection of needle to nerve contact based on electric bioimpedance and machine learning methods. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2017; 2017:9-12. [PMID: 29059798 DOI: 10.1109/embc.2017.8036750] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In an ongoing project for electrical impedance-based needle guidance we have previously showed in an animal model that intraneural needle positions can be detected with bioimpedance measurement. To enhance the power of this method we in this study have investigated whether an early detection of the needle only touching the nerve also is feasible. Measurement of complex impedance during needle to nerve contact was compared with needle positions in surrounding tissues in a volunteer study on 32 subjects. Classification analysis using Support-Vector Machines demonstrated that discrimination is possible, but that the sensitivity and specificity for the nerve touch algorithm not is at the same level of performance as for intra-neuralintraneural detection.
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15
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Hendrickx JFA, De Wolf AM. Journal of clinical monitoring and computing 2016 end of year summary: anesthesia. J Clin Monit Comput 2017; 31:1-4. [PMID: 28064412 DOI: 10.1007/s10877-017-9977-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 12/21/2016] [Indexed: 11/28/2022]
Abstract
Clinical monitoring and computing are essential during general anesthesia. As a result it would be impossible to review all the articles published in the Journal of Clinical Monitoring and Computing that are relevant to anesthesia. We therefore will limit this summary to those articles that are uniquely related to anesthesia. The topics include: anesthesia machines; ensuring the airway; anesthetic depth; neuromuscular transmission monitoring; locoregional anesthesia; ultrasound; and pain.
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Affiliation(s)
- Jan F A Hendrickx
- Department of Anesthesiology, Intensive Care and Pain Therapy, OLV Hospital, Moorselbaan 164, 9300, Aalst, Belgium.
| | - Andre M De Wolf
- Department of Anesthesiology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
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16
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Pettersen FJ, Martinsen ØG, Høgetveit JO, Kalvøy H, Odland HH. Bioimpedance measurements of temporal changes in beating hearts. Biomed Phys Eng Express 2016. [DOI: 10.1088/2057-1976/2/6/065015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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Detection of spine structures with Bioimpedance Probe (BIP) Needle in clinical lumbar punctures. J Clin Monit Comput 2016; 31:1065-1072. [DOI: 10.1007/s10877-016-9915-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2016] [Accepted: 07/29/2016] [Indexed: 10/21/2022]
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18
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Sauter AR, Romundstad L. Animal models can help us prevent nerve injuries in regional anaesthesia for patients. Acta Anaesthesiol Scand 2016; 60:284-8. [PMID: 26806955 DOI: 10.1111/aas.12680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. R. Sauter
- Department of Research and Developement; Division of Emergencies and Critical Care; Oslo University Hospital; Oslo Norway
- Department of Anesthesiology and Pain Medicine; lnselspital; Bern University Hospital; University of Bern; Bern Switzerland
| | - L. Romundstad
- Division of Emergencies and Critical Care; Department of Anaesthesiology; Oslo University Hospital; Rikshospitalet; Oslo Norway
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