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Laracca M, Miele G, Podestà L, Sangiovanni S. A Non-Invasive Technique for Long-Term Monitoring of Gastroesophageal Reflux-A Pilot Study. SENSORS (BASEL, SWITZERLAND) 2023; 23:9459. [PMID: 38067832 PMCID: PMC10708781 DOI: 10.3390/s23239459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 11/17/2023] [Accepted: 11/24/2023] [Indexed: 12/18/2023]
Abstract
Many people suffer from gastric or gastroesophageal reflux disorder (GERD) due to a malfunction of the cardia, the valve between the esophagus and the stomach. GERD is a syndrome caused by the ascent of gastric juices and bile from the stomach. This article proposes a non-invasive impedance measurement method and demonstrates the correlation between GERD and impedance variation between appropriately chosen points on the patient's chest. This method is presented as an alternative to the most widely accepted diagnostic techniques for reflux, such as pH-metry, pH-impedance measurement, and esophageal manometry, which are invasive because they use a probe that is inserted through a nostril and reaches down to the esophagus.
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Affiliation(s)
- Marco Laracca
- Department of Astronautics, Electrical and Energetics Engineering (DIAEE), Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy; (M.L.); (L.P.)
| | - Gianfranco Miele
- Department of Electrical and Information Engineering, University of Cassino and Southern Lazio, 03043 Cassino, Italy;
| | - Luca Podestà
- Department of Astronautics, Electrical and Energetics Engineering (DIAEE), Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy; (M.L.); (L.P.)
| | - Silvia Sangiovanni
- Department of Astronautics, Electrical and Energetics Engineering (DIAEE), Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy; (M.L.); (L.P.)
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Brandwood BM, Naik GR, Gunawardana U, Gargiulo GD. Combined Cardiac and Respiratory Monitoring from a Single Signal: A Case Study Employing the Fantasia Database. SENSORS (BASEL, SWITZERLAND) 2023; 23:7401. [PMID: 37687857 PMCID: PMC10490584 DOI: 10.3390/s23177401] [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: 07/12/2023] [Revised: 08/16/2023] [Accepted: 08/22/2023] [Indexed: 09/10/2023]
Abstract
This study proposes a novel method for obtaining the electrocardiogram (ECG) derived respiration (EDR) from a single lead ECG and respiration-derived cardiogram (RDC) from a respiratory stretch sensor. The research aims to reconstruct the respiration waveform, determine the respiration rate from ECG QRS heartbeat complexes data, locate heartbeats, and calculate a heart rate (HR) using the respiration signal. The accuracy of both methods will be evaluated by comparing located QRS complexes and inspiration maxima to reference positions. The findings of this study will ultimately contribute to the development of new, more accurate, and efficient methods for identifying heartbeats in respiratory signals, leading to better diagnosis and management of cardiovascular diseases, particularly during sleep where respiration monitoring is paramount to detect apnoea and other respiratory dysfunctions linked to a decreased life quality and known cause of cardiovascular diseases. Additionally, this work could potentially assist in determining the feasibility of using simple, no-contact wearable devices for obtaining simultaneous cardiology and respiratory data from a single device.
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Affiliation(s)
- Benjamin M. Brandwood
- School of Engineering, Design and Built Environment, Western Sydney University, Penrith, NSW 2751, Australia;
| | - Ganesh R. Naik
- Adelaide Institute for Sleep Health, College of Medicine and Public Health, Flinders University, Adelaide, SA 5042, Australia;
| | - Upul Gunawardana
- School of Engineering, Design and Built Environment, Western Sydney University, Penrith, NSW 2751, Australia;
| | - Gaetano D. Gargiulo
- School of Engineering, Design and Built Environment, Western Sydney University, Penrith, NSW 2751, Australia;
- The MARCS Institute, Westmead, NSW 2145, Australia
- Translational Research Health Institute, Westmead, NSW 2145, Australia
- The Ingam Institute for Medical Research, Liverpool, NSW 2170, Australia
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Safari R. Lower limb prosthetic interfaces: Clinical and technological advancement and potential future direction. Prosthet Orthot Int 2020; 44:384-401. [PMID: 33164655 DOI: 10.1177/0309364620969226] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The human-prosthesis interface is one of the most complicated challenges facing the field of prosthetics, despite substantive investments in research and development by researchers and clinicians around the world. The journal of the International Society for Prosthetics and Orthotics, Prosthetics and Orthotics International, has contributed substantively to the growing body of knowledge on this topic. In celebrating the 50th anniversary of the International Society for Prosthetics and Orthotics, this narrative review aims to explore how human-prosthesis interfaces have changed over the last five decades; how research has contributed to an understanding of interface mechanics; how clinical practice has been informed as a result; and what might be potential future directions. Studies reporting on comparison, design, manufacturing and evaluation of lower limb prosthetic sockets, and osseointegration were considered. This review demonstrates that, over the last 50 years, clinical research has improved our understanding of socket designs and their effects; however, high-quality research is still needed. In particular, there have been advances in the development of volume and thermal control mechanisms with a few designs having the potential for clinical application. Similarly, advances in sensing technology, soft tissue quantification techniques, computing technology, and additive manufacturing are moving towards enabling automated, data-driven manufacturing of sockets. In people who are unable to use a prosthetic socket, osseointegration provides a functional solution not available 50 years ago. Furthermore, osseointegration has the potential to facilitate neuromuscular integration. Despite these advances, further improvement in mechanical features of implants, and infection control and prevention are needed.
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Affiliation(s)
- Reza Safari
- Health and Social Care Research Centre, University of Derby, Derby, UK
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Ye J, Wu H, Wu L, Long J, Zhang Y, Chen G, Wang C, Luo X, Hou Q, Xu Y. An Adaptive Method for Gait Event Detection of Gait Rehabilitation Robots. Front Neurorobot 2020; 14:38. [PMID: 32903323 PMCID: PMC7396541 DOI: 10.3389/fnbot.2020.00038] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Accepted: 05/20/2020] [Indexed: 11/13/2022] Open
Abstract
Accurate gait event detection is necessary for control strategies of gait rehabilitation robots. However, due to personal diversity between individuals, it is a challenge for robots to detect a gait event at various stride frequencies. This paper proposes a novel method for gait event detection of a gait rehabilitation robot using a single inertial sensor mounted on the thigh. A self-adaptive threshold for detecting heel strike is obtained in real time via a linear regression model. Observable thresholds for toe off detection are constant at various stride frequencies. Experiments are conducted based on 20 healthy subjects and six hemiplegic patients wearing a gait rehabilitation robot and walking at various kinds of stride frequencies. The experimental results show that the proposed method can detect heel strike and toe off gait events within an average 2% gait cycle temporal errors and never miss two-gait event detection. Compared to the conventional thresholding method, this work presents a simple and robust application for gait event detection in healthy and hemiplegic subjects by one inertial sensor. The linear regression model can be applicable to different subjects walking at various stride frequencies.
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Affiliation(s)
- Jing Ye
- Shenzhen MileBot Robotics Co., Ltd., Shenzhen, China.,Shenzhen Institute of Geriatrics, Shenzhen, China
| | - Hongde Wu
- Shenzhen MileBot Robotics Co., Ltd., Shenzhen, China
| | - Lishan Wu
- Department of Rehabilitation Medicine, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
| | - Jianjun Long
- Rehabilitation Center, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - Yuling Zhang
- Stroke Biological Recovery Laboratory, Spaulding Rehabilitation Hospital, Harvard Medical School, Boston, MA, United States.,School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Gong Chen
- Shenzhen MileBot Robotics Co., Ltd., Shenzhen, China.,Shenzhen Institute of Geriatrics, Shenzhen, China
| | - Chunbao Wang
- Shenzhen Institute of Geriatrics, Shenzhen, China
| | - Xun Luo
- Kerry Rehabilitation Medicine Research Institute, Shenzhen, China.,Shenzhen Sanming Project Group, Spaulding Rehabilitation Hospital, Harvard Medical School, Boston, MA, United States.,Shenzhen Dapeng New District Nan'ao People's Hospital, Shenzhen, China
| | - Qinghua Hou
- Clinical Neuroscience Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
| | - Yi Xu
- Department of Rehabilitation Medicine, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
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Chadwell A, Diment L, Micó-Amigo M, Morgado Ramírez DZ, Dickinson A, Granat M, Kenney L, Kheng S, Sobuh M, Ssekitoleko R, Worsley P. Technology for monitoring everyday prosthesis use: a systematic review. J Neuroeng Rehabil 2020; 17:93. [PMID: 32665020 PMCID: PMC7362458 DOI: 10.1186/s12984-020-00711-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 06/23/2020] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Understanding how prostheses are used in everyday life is central to the design, provision and evaluation of prosthetic devices and associated services. This paper reviews the scientific literature on methodologies and technologies that have been used to assess the daily use of both upper- and lower-limb prostheses. It discusses the types of studies that have been undertaken, the technologies used to monitor physical activity, the benefits of monitoring daily living and the barriers to long-term monitoring, with particular focus on low-resource settings. METHODS A systematic literature search was conducted in PubMed, Web of Science, Scopus, CINAHL and EMBASE of studies that monitored the activity of prosthesis users during daily-living. RESULTS Sixty lower-limb studies and 9 upper-limb studies were identified for inclusion in the review. The first studies in the lower-limb field date from the 1990s and the number has increased steadily since the early 2000s. In contrast, the studies in the upper-limb field have only begun to emerge over the past few years. The early lower-limb studies focused on the development or validation of actimeters, algorithms and/or scores for activity classification. However, most of the recent lower-limb studies used activity monitoring to compare prosthetic components. The lower-limb studies mainly used step-counts as their only measure of activity, focusing on the amount of activity, not the type and quality of movements. In comparison, the small number of upper-limb studies were fairly evenly spread between development of algorithms, comparison of everyday activity to clinical scores, and comparison of different prosthesis user populations. Most upper-limb papers reported the degree of symmetry in activity levels between the arm with the prosthesis and the intact arm. CONCLUSIONS Activity monitoring technology used in conjunction with clinical scores and user feedback, offers significant insights into how prostheses are used and whether they meet the user's requirements. However, the cost, limited battery-life and lack of availability in many countries mean that using sensors to understand the daily use of prostheses and the types of activity being performed has not yet become a feasible standard clinical practice. This review provides recommendations for the research and clinical communities to advance this area for the benefit of prosthesis users.
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Affiliation(s)
| | - Laura Diment
- People Powered Prosthetics Group, University of Southampton, Southampton, UK
| | - M Micó-Amigo
- People Powered Prosthetics Group, University of Southampton, Southampton, UK
| | | | - Alex Dickinson
- People Powered Prosthetics Group, University of Southampton, Southampton, UK.
- Exceed Research Network, Exceed Worldwide, Lisburn, UK.
| | - Malcolm Granat
- University of Salford, Salford, UK
- Exceed Research Network, Exceed Worldwide, Lisburn, UK
| | - Laurence Kenney
- University of Salford, Salford, UK
- Exceed Research Network, Exceed Worldwide, Lisburn, UK
| | - Sisary Kheng
- University of Salford, Salford, UK
- Exceed Worldwide, Phnom Penh, Cambodia
| | | | | | - Peter Worsley
- People Powered Prosthetics Group, University of Southampton, Southampton, UK
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Freeborn TJ, Fu B. Time-course bicep tissue bio-impedance changes throughout a fatiguing exercise protocol. Med Eng Phys 2019; 69:109-115. [PMID: 31056402 DOI: 10.1016/j.medengphy.2019.04.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 03/19/2019] [Accepted: 04/09/2019] [Indexed: 12/14/2022]
Abstract
This study investigated the localized electrical-impedance changes in the biceps tissues throughout a fatiguing exercise protocol. During the protocol, 17 subjects performed 10 sets of bicep curl repetitions at either 60% or 75% of their one-repetition maximum weight until task failure. The localized tissue impedance (resistance, reactance, phase angle) was measured at 10 kHz, 50 kHz, and 100 kHz immediately after each of 10 sets for comparison against the baseline pre-fatigue measures. A trend of decreasing resistance and reactance magnitude were observed, with greater changes occurring as the protocol progressed. Statistical testing demonstrated statistically significant changes in resistance, reactance, and phase angle for both groups of participants. The significant changes in resistance were observed at earlier time-points than the reactance and phase angle changes for both groups.
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Affiliation(s)
- Todd J Freeborn
- Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA.
| | - Bo Fu
- Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA
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Kusche R, Kaufmann S, Ryschka M. Dry electrodes for bioimpedance measurements—design, characterization and comparison. Biomed Phys Eng Express 2018. [DOI: 10.1088/2057-1976/aaea59] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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PECULIARITIES OF RHEOVASOGRAPHY PARAMETERS OF THE SHIN IN VOLLEYBALL PLAYERS, WRESTLERS, ATHLETES OF MESOMORPHIC SOMATOTYPE. WORLD OF MEDICINE AND BIOLOGY 2018. [DOI: 10.26724/2079-8334-2018-1-63-52-56] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Khapitska OP, Ivanytsya AA, Stefanenko IS, Sarafinyuk LA, Moroz VM. [CHANGES IN RHEOGRAPHIC INDICATORS OF SHIN IN ATHLETES OF DIFFERENT KINDS OF SPORTS]. ACTA ACUST UNITED AC 2017; 63:51-59. [PMID: 29975828 DOI: 10.15407/fz63.01.051] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We determined the changes of time, amplitude and derivatives of these indicators of rheovasograms of shin in sportsmen of youth age and high level of skills engaged in volleyball, athletics and wrestling with sports experience at least 3 years. We determined significant differences in the value of time, amplitude and derivatives of these indicators ofrheovazograms of shin in males youth age, depending on the impact of intense exercise. The volleyball players compared to youth who do not exercise, reliably large values of the overall tone of the arteries (11,2%), arteries of large diameter (8,2%), arteries of medium and small diameters (13,5%), time ascending part of rheovazograms (2%) and a slow passage (5,9%) and less dycrotycs index (17%), duration ofrheographic wave (3,7%), time descending part of rheovazograms (10%). The persons of control group had higher values of baseline impedance than wrestlers (9,9%) and athletes (13,7%) and all amplitude indicators rheograms of the shin than athletes (average 12-15%) and wrestlers (22-23%). The size and volume of blood flow to the arteries of the extremities adapted to the metabolic needs of the relevant muscles. In volleyball players compared to the athletes, a lower duration of rheographic wave (10%), time of downlink part of the rheograms (12,7%), the base impedance (17,2%), amplitude of the systolic wave (17%) and rapid blood filling (21%), all indicators tone of arteries (12,2-16,9%) and greater value of time of rising part of rheograms (3,5%) and slow blood filling (5,9%). Wrestlers compared to the athletes have a lower duration of rheographic wave (6,1%), time of downlink part of the rheograms (6,1%), the amplitude of the systolic wave (9,3%), compared with volleyball players set lower values of average speed of fast blood filling (15,6%), tone of arteries with different diameters (15-16,5%), all amplitude indicators (20-28%), time slow blood filling (9,7%), ascending parts rheogram (10,3%). Thus, the level ofphysical activity and especially muscle activity has a significant effect on the performance of regional blood flow.
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Naydenova E, Cavendish S, Wilson AJ. Measurement and modelling the sensitivity of tetrapolar transfer impedance measurements. Med Eng Phys 2016; 38:1090-9. [PMID: 27475783 DOI: 10.1016/j.medengphy.2016.07.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 06/06/2016] [Accepted: 07/07/2016] [Indexed: 10/21/2022]
Abstract
Finite element method (FEM) modelling of a small disk in a homogeneous saline medium showed that the sensitivity distribution for tetrapolar transfer impedance measurements was dependant on the ratio, σdisk/σsaline, and not absolute conductivity values. In addition, the amplitude of the negative sensitivity regions between the drive and receive electrodes decreased non-linearly with σdisk/σsaline for σdisk/σsaline < 1, eventually becoming zero. This non-linear behaviour determined the limit of the assumption of a small change in conductivity in Geselowitz's lead theorem with 0.5 <σdisk/σsaline <1.5 for the measurements reported. The modelling supported the design of a sensitivity measurement system using an insulating support and a metal disk in a saline filled tank. Measurements were shown to give good agreement with sensitivity predictions from Geselowitz's lead theorem. Replacing the homogeneous medium in the FEM model with layers of different conductivity parallel to the plane of the electrodes changed the sensitivity distribution when the thickness of the layers adjacent to the electrodes were less than ½ the electrode spacing. A layer of greater conductivity over a layer of lesser conductivity next to the electrodes gave a peak in the sensitivity distribution and extended regions of negative sensitivity further into the tissue.
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Affiliation(s)
- E Naydenova
- Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
| | - S Cavendish
- Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
| | - A J Wilson
- Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Department of Clinical Physics and Bioengineering, University Hospital, Coventry CV2 2DX, UK .
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Extraction of Cole parameters from the electrical bioimpedance spectrum using stochastic optimization algorithms. Med Biol Eng Comput 2015. [DOI: 10.1007/s11517-015-1355-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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12
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Yang Y, Ni W, Sun Q, Wen H, Teng Z. Improved Cole parameter extraction based on the least absolute deviation method. Physiol Meas 2013; 34:1239-52. [PMID: 24021745 DOI: 10.1088/0967-3334/34/10/1239] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The Cole function is widely used in bioimpedance spectroscopy (BIS) applications. Fitting the measured BIS data onto the model and then extracting the Cole parameters (R0, R∞, α and τ) is a common practice. Accurate extraction of the Cole parameters from the measured BIS data has great significance for evaluating the physiological or pathological status of biological tissue. The traditional least-squares (LS)-based curve fitting method for Cole parameter extraction is often sensitive to noise or outliers and becomes non-robust. This paper proposes an improved Cole parameter extraction based on the least absolute deviation (LAD) method. Comprehensive simulation experiments are carried out and the performances of the LAD method are compared with those of the LS method under the conditions of outliers, random noises and both disturbances. The proposed LAD method exhibits much better robustness under all circumstances, which demonstrates that the LAD method is deserving as an improved alternative to the LS method for Cole parameter extraction for its robustness to outliers and noises.
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Affiliation(s)
- Yuxiang Yang
- Department of Precision Instrumentation Engineering, Xi'an University of Technology, Xi'an, People's Republic of China
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