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Safary E, Lepeska M, Beran D, Ewen M, Zhaparova A, Rukare J, Boulle P, Aebischer Perone S, Makohliso S, Pleus S, Vetter B. Development of a target product profile for new glucose self-monitoring technologies for use in low- and middle-income countries. PLoS One 2024; 19:e0309062. [PMID: 39186719 PMCID: PMC11346918 DOI: 10.1371/journal.pone.0309062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Accepted: 08/06/2024] [Indexed: 08/28/2024] Open
Abstract
AIMS Most glucose self-monitoring devices have been developed with high-income countries in mind. We developed a target product profile (TPP) for new glucose self-monitoring technologies for users in low- and middle-income countries (LMICs). METHODS A draft TPP including 39 characteristics was developed by an expert group including diabetes specialists, device specialists, and people with diabetes, incorporating findings from qualitative research in LMICs. Each characteristic had minimal and optimal requirements for two use cases, frequent and sporadic use. Characteristics requiring refinement were identified via online survey. Characteristics with agreement level <90% for any requirement were reviewed by the expert group and amended as appropriate. RESULTS One characteristic (shelf life) had agreement <75% (both requirements for both use cases). Characteristics with agreement ≥75% and <90% for the frequent use case included infrastructure level, measurement cycle, duration of use before replacement, interchangeability, and calibration (both requirements), and activity log and price per month to end payer (minimal requirement). Intended use (both requirements), accuracy, and price per month to end payer (optimal requirement) had agreement ≥75% and <90% for the sporadic use case. CONCLUSIONS This TPP will inform developers on requirements for glucose self-monitoring technologies for LMICs, and support decision-makers in evaluating existing devices.
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Affiliation(s)
| | | | - David Beran
- Division of Tropical and Humanitarian Medicine, University of Geneva and Geneva University Hospitals, Geneva, Switzerland
| | | | | | | | | | - Sigiriya Aebischer Perone
- Division of Tropical and Humanitarian Medicine, University of Geneva and Geneva University Hospitals, Geneva, Switzerland
- International Committee of the Red Cross, Geneva, Switzerland
| | - Solomzi Makohliso
- Essential Tech Centre, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Stefan Pleus
- Institut für Diabetes Technologie Forschungs- und Entwicklungsgesellschaft mbH an der Universität Ulm, Ulm, Germany
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2
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Baker RT, Martonick NJP, Smitley MC, Ludwig CM, Reeves AJ. Instrument-Assisted Soft Tissue Mobilization 2-Handed Grip Force Production Consistency During Simulated Treatment: A Technical Report. J Sport Rehabil 2024:1-8. [PMID: 39179227 DOI: 10.1123/jsr.2023-0337] [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: 09/27/2023] [Revised: 05/23/2024] [Accepted: 05/28/2024] [Indexed: 08/26/2024]
Abstract
CONTEXT Instrument-assisted soft tissue mobilization (IASTM) continues to increase in popularity and utilization among manual therapists. Despite its popularity, little is known about the consistency in peak or average forces that clinicians apply when performing IASTM treatments with a 2-handed grip. The purpose of this study was to examine intraclinician consistency in peak and average forces when applying a 2-handed IASTM grip. DESIGN Randomized crossover study conducted in a university biomechanics laboratory. METHODS Five (5) licensed athletic trainers with prior IASTM training used 5 different IASTM instruments to apply simulated treatment. Average peak forces (Fpeak) and average mean forces (Fmean) were collected via force plate for all 5 IASTM instruments with a skin simulant attached. Descriptive statistics, coefficients of variation (CVs), box and density plots, and Bland-Altman plots were assessed. RESULTS The clinicians' average Fpeak ranged from 3.0 N to 11.6 N and average Fmean from 1.9 N to 8.1 N. Fpeak CVs for all instruments ranged from 14% to 31%, and Fmean CVs ranged from 15% to 35%. Bland-Altman plots indicated that for both Fpeak and Fmean, 97% of the data points fell within the limits of agreement across instruments and clinicians. Mean differences across instruments ranged from 0.9 N (91.8 g) to 4.1 N (418.1 g) for Fpeak and from 1.0 N (102.0 g) to 2.8 N (285.5 g) for Fmean. Thus, CVs, box and density plots, and Bland-Altman plots supported general force application consistency. CONCLUSION Trained IASTM clinicians produced consistent treatment application forces (ie, Fpeak and Fmean) within treatment sessions during 2-handed simulated application.
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Affiliation(s)
- Russell T Baker
- Department of Movement Sciences, University of Idaho, Moscow, ID, USA
- WWAMI Medical Education Program, University of Idaho, Moscow, ID, USA
| | - Nickolai J P Martonick
- Department of Movement Sciences, University of Idaho, Moscow, ID, USA
- WWAMI Medical Education Program, University of Idaho, Moscow, ID, USA
| | - Matthew C Smitley
- Department of Movement Sciences, University of Idaho, Moscow, ID, USA
| | | | - Ashley J Reeves
- Department of Movement Sciences, University of Idaho, Moscow, ID, USA
- WWAMI Medical Education Program, University of Idaho, Moscow, ID, USA
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3
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Tan S, Wang Y, Wei X, Xiao X, Gao L. Microneedle-mediated drug delivery for neurological diseases. Int J Pharm 2024; 661:124400. [PMID: 38950662 DOI: 10.1016/j.ijpharm.2024.124400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 06/23/2024] [Accepted: 06/26/2024] [Indexed: 07/03/2024]
Abstract
Neurological disorders, including brain injury, brain tumors, and neurodegenerative diseases, rank as the second leading cause of death worldwide. Exploring effective new treatments for neurological disorders has long been a hot research issue in clinical practice. Recently, microneedles (MNs) have attracted much attention due to their designation as a "painless and non-invasive" novel transdermal delivery method, characterized by their biocompatibility and sustainability. The advantages of MNs open an avenue for potential therapeutic interventions targeting neurological disorders. This review presents a concise overview of progress in the field of MNs, with highlights on the application in the treatment of neurological disorders. Notably, trends in the development of MNs and future challenges are also discussed.
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Affiliation(s)
- Shuna Tan
- Laboratory of Molecular Translational Medicine, Center for Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China; West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, PR China.
| | - Yitian Wang
- Laboratory of Molecular Translational Medicine, Center for Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China; West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, PR China.
| | - Xuan Wei
- Laboratory of Molecular Translational Medicine, Center for Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China; West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, PR China.
| | - Xiao Xiao
- Laboratory of Molecular Translational Medicine, Center for Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China.
| | - Linbo Gao
- Laboratory of Molecular Translational Medicine, Center for Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China; West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, PR China.
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Aycock KI, Battisti T, Peterson A, Yao J, Kreuzer S, Capelli C, Pant S, Pathmanathan P, Hoganson DM, Levine SM, Craven BA. Toward trustworthy medical device in silico clinical trials: a hierarchical framework for establishing credibility and strategies for overcoming key challenges. Front Med (Lausanne) 2024; 11:1433372. [PMID: 39188879 PMCID: PMC11346031 DOI: 10.3389/fmed.2024.1433372] [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: 05/15/2024] [Accepted: 07/10/2024] [Indexed: 08/28/2024] Open
Abstract
Computational models of patients and medical devices can be combined to perform an in silico clinical trial (ISCT) to investigate questions related to device safety and/or effectiveness across the total product life cycle. ISCTs can potentially accelerate product development by more quickly informing device design and testing or they could be used to refine, reduce, or in some cases to completely replace human subjects in a clinical trial. There are numerous potential benefits of ISCTs. An important caveat, however, is that an ISCT is a virtual representation of the real world that has to be shown to be credible before being relied upon to make decisions that have the potential to cause patient harm. There are many challenges to establishing ISCT credibility. ISCTs can integrate many different submodels that potentially use different modeling types (e.g., physics-based, data-driven, rule-based) that necessitate different strategies and approaches for generating credibility evidence. ISCT submodels can include those for the medical device, the patient, the interaction of the device and patient, generating virtual patients, clinical decision making and simulating an intervention (e.g., device implantation), and translating acute physics-based simulation outputs to health-related clinical outcomes (e.g., device safety and/or effectiveness endpoints). Establishing the credibility of each ISCT submodel is challenging, but is nonetheless important because inaccurate output from a single submodel could potentially compromise the credibility of the entire ISCT. The objective of this study is to begin addressing some of these challenges and to identify general strategies for establishing ISCT credibility. Most notably, we propose a hierarchical approach for assessing the credibility of an ISCT that involves systematically gathering credibility evidence for each ISCT submodel in isolation before demonstrating credibility of the full ISCT. Also, following FDA Guidance for assessing computational model credibility, we provide suggestions for ways to clearly describe each of the ISCT submodels and the full ISCT, discuss considerations for performing an ISCT model risk assessment, identify common challenges to demonstrating ISCT credibility, and present strategies for addressing these challenges using our proposed hierarchical approach. Finally, in the Appendix we illustrate the many concepts described here using a hypothetical ISCT example.
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Affiliation(s)
- Kenneth I. Aycock
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, United States Food and Drug Administration, Silver Spring, MD, United States
| | | | | | - Jiang Yao
- Dassault Systèmes, Waltham, MA, United States
| | | | - Claudio Capelli
- Institute of Cardiovascular Science, University College London, London, United Kingdom
| | - Sanjay Pant
- Faculty of Science and Engineering, Swansea University, Swansea, United Kingdom
| | - Pras Pathmanathan
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, United States Food and Drug Administration, Silver Spring, MD, United States
| | - David M. Hoganson
- Department of Cardiac Surgery, Boston Children’s Hospital, Harvard Medical School, Boston, MA, United States
| | | | - Brent A. Craven
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, United States Food and Drug Administration, Silver Spring, MD, United States
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Alamir SH, Tufaro V, Trilli M, Kitslaar P, Mathur A, Baumbach A, Jacob J, Bourantas CV, Torii R. Rapid prediction of wall shear stress in stenosed coronary arteries based on deep learning. Front Bioeng Biotechnol 2024; 12:1360330. [PMID: 39188371 PMCID: PMC11345599 DOI: 10.3389/fbioe.2024.1360330] [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: 12/22/2023] [Accepted: 07/12/2024] [Indexed: 08/28/2024] Open
Abstract
There is increasing evidence that coronary artery wall shear stress (WSS) measurement provides useful prognostic information that allows prediction of adverse cardiovascular events. Computational Fluid Dynamics (CFD) has been extensively used in research to measure vessel physiology and examine the role of the local haemodynamic forces on the evolution of atherosclerosis. Nonetheless, CFD modelling remains computationally expensive and time-consuming, making its direct use in clinical practice inconvenient. A number of studies have investigated the use of deep learning (DL) approaches for fast WSS prediction. However, in these reports, patient data were limited and most of them used synthetic data generation methods for developing the training set. In this paper, we implement 2 approaches for synthetic data generation and combine their output with real patient data in order to train a DL model with a U-net architecture for prediction of WSS in the coronary arteries. The model achieved 6.03% Normalised Mean Absolute Error (NMAE) with inference taking only 0.35 s; making this solution time-efficient and clinically relevant.
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Affiliation(s)
- Salwa Husam Alamir
- Department of Mechanical Engineering, University College London, London, United Kingdom
| | - Vincenzo Tufaro
- Barts Heart Centre, Barts Health NHS Trust, London, United Kingdom
- Centre for Cardiovascular Medicine and Devices, William Harvey Research Institute, Queen Mary University of London, London, United Kingdom
| | - Matilde Trilli
- Department of Mechanical Engineering, University College London, London, United Kingdom
| | | | - Anthony Mathur
- Barts Heart Centre, Barts Health NHS Trust, London, United Kingdom
- Centre for Cardiovascular Medicine and Devices, William Harvey Research Institute, Queen Mary University of London, London, United Kingdom
- NIHR Barts Biomedical Research Centre, Queen Mary University of London, London, United Kingdom
| | - Andreas Baumbach
- Barts Heart Centre, Barts Health NHS Trust, London, United Kingdom
- Centre for Cardiovascular Medicine and Devices, William Harvey Research Institute, Queen Mary University of London, London, United Kingdom
| | - Joseph Jacob
- Satsuma Lab, Centre for Medical Image Computing, University College London, London, United Kingdom
- UCL Respiratory, University College London, London, United Kingdom
| | - Christos V. Bourantas
- Barts Heart Centre, Barts Health NHS Trust, London, United Kingdom
- Centre for Cardiovascular Medicine and Devices, William Harvey Research Institute, Queen Mary University of London, London, United Kingdom
| | - Ryo Torii
- Department of Mechanical Engineering, University College London, London, United Kingdom
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6
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Leungsuwan DS, Chandran M. Bone Fragility in Diabetes and its Management: A Narrative Review. Drugs 2024:10.1007/s40265-024-02078-5. [PMID: 39103693 DOI: 10.1007/s40265-024-02078-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/24/2024] [Indexed: 08/07/2024]
Abstract
Bone fragility is a serious yet under-recognised complication of diabetes mellitus (DM) that is associated with significant morbidity and mortality. Multiple complex pathophysiological mechanisms mediating bone fragility amongst DM patients have been proposed and identified. Fracture risk in both type 1 diabetes (T1D) and type 2 diabetes (T2D) continues to be understated and underestimated by conventional risk assessment tools, posing an additional challenge to the identification of at-risk patients who may benefit from earlier intervention or preventive strategies. Over the years, an increasing body of evidence has demonstrated the efficacy of osteo-pharmacological agents in managing skeletal fragility in DM. This review seeks to elaborate on the risk of bone fragility in DM, the underlying pathogenesis and skeletal alterations, the approach to fracture risk assessment in DM, management strategies and therapeutic options.
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Affiliation(s)
| | - Manju Chandran
- Osteoporosis and Bone Metabolism Unit, Department of Endocrinology, Singapore General Hospital, 20 College Road, ACADEMIA, Singapore, 169856, Singapore.
- DUKE NUS Medical School, Singapore, Singapore.
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7
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Dienstman J, Stachelek SJ, Krieger AM, Eskandanian K, Espinoza JC, Harrison MR, Koh CJ, Peiris V, Torjusen E, Levy RJ. Pediatric Device Clinical Trials Activity: 1999-2022. Pediatrics 2024; 154:e2023063466. [PMID: 38953121 DOI: 10.1542/peds.2023-063466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 05/06/2024] [Accepted: 05/07/2024] [Indexed: 07/03/2024] Open
Abstract
OBJECTIVES This study assessed the state of pediatric medical device (PMD) development by comparing PMD clinical trials to pediatric trials evaluating drugs and biologics, from 1999 to 2022. METHODS The site www.clinicaltrials.gov was used to identify and quantify both PMD clinical trials and pediatric trials for drugs and biologics. Clinical specialty was also assessed. The institutions included were the 7 children's hospitals primarily affiliated with the Food and Drug Administration (FDA) Pediatric Device Consortia (PDC) grant program between 2018 and 2023. For a national comparison, an additional search assessed PMD trials across all US medical institutions. RESULTS A total of 243 PMD clinical trials were identified at the FDA-PDC institutions on the basis of the year of initiation; the average number of PMD trials initiated per year per institution was 1.5 from 1999 to 2022. However, PMD trials significantly increased during the period 2014 to 2022 compared with 1999 to 2013 (P < .001); the rate of initiation of drug and biologic pediatric trials demonstrated no significant differences between these time periods. A national survey of all institutions initiating PMD trials, and drugs and biologics trials, identified 1885 PMD trials out of a total 12 943. A comparable trend was noted in the national survey with initiation of PMD trials increasing significantly from 2014 to 2022 (P < .001), compared with 1999 to 2013, whereas the rate of initiation of drug and biologic trials during these periods did not demonstrate a significant change. CONCLUSIONS Although pediatric clinical trial initiation for drugs and biologics remained stable from 1999 to 2022, the rate of new PMD trials significantly increased during the period 2014 to 2022 at FDA-PDC institutions and nationally.
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Affiliation(s)
- Joshua Dienstman
- Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Stanley J Stachelek
- Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Abba M Krieger
- Department of Statistics and Data Science, The Wharton School, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Kolaleh Eskandanian
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Children's National Hospital, Washington, District of Columbia
| | - Juan C Espinoza
- Stanley Manne Children's Research Institute, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois
| | - Michael R Harrison
- Division of Pediatric Surgery, Department of Surgery, University of California San Francisco School of Medicine, San Francisco, California
| | - Chester J Koh
- Division of Pediatric Urology, Texas Children's Hospital, and Scott Department of Urology, Baylor College of Medicine, Houston, Texas
| | - Vasum Peiris
- Pediatrics and Special Populations, Center for Devices and Radiological Health
| | - Erika Torjusen
- Office of Orphan Products Development, Office of the Commissioner, Food and Drug Administration, Silver Spring, Maryland
| | - Robert J Levy
- Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
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Naga HI, Oyola AM, Kim JK, Hope WW, Farber L, Yoo JS. Retrorectus Ventral Hernia Repair Utilizing T-line Hernia Mesh: Technical Descriptions. PLASTIC AND RECONSTRUCTIVE SURGERY-GLOBAL OPEN 2024; 12:e6101. [PMID: 39188965 PMCID: PMC11346900 DOI: 10.1097/gox.0000000000006101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2024] [Accepted: 07/01/2024] [Indexed: 08/28/2024]
Abstract
The T-line hernia mesh is a synthetic, polypropylene mesh with mesh suture extensions designed to prevent anchor point failure by evenly distributing tension across the soft tissue. Previous studies have demonstrated the success of onlay ventral hernia repair with T-line hernia mesh, but retrorectus applications of the mesh have not yet been characterized. This technique article illustrates technical descriptions and clinical applications of the T-line hernia mesh in the retrorectus plane.
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Affiliation(s)
- Hani I. Naga
- From the Department of Surgery, Duke University Medical Center, Durham N.C
| | - Anna Malysz Oyola
- Department of General Surgery, Novant Health New Hanover Regional Medical Center, Wilmington, N.C
| | - Joshua K. Kim
- From the Department of Surgery, Duke University Medical Center, Durham N.C
| | - William W. Hope
- Department of General Surgery, Novant Health New Hanover Regional Medical Center, Wilmington, N.C
| | | | - Jin S. Yoo
- From the Department of Surgery, Duke University Medical Center, Durham N.C
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9
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Li T, Wang J, Liu C, Li S, Wang K, Chang S. Adaptive fuzzy iterative learning control based neurostimulation system and in-silico evaluation. Cogn Neurodyn 2024; 18:1767-1778. [PMID: 39104687 PMCID: PMC11297872 DOI: 10.1007/s11571-023-10040-6] [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: 06/15/2023] [Revised: 10/09/2023] [Accepted: 11/09/2023] [Indexed: 08/07/2024] Open
Abstract
Closed-loop neural stimulation has been an effective treatment for epilepsy patients. Currently, most closed-loop neural stimulation strategies are designed based on accurate neural models. However, the uncertainty and complexity of the neural system make it difficult to build an accurate neural model, which poses a significant challenge to the design of the controller. This paper proposes an Adaptive Fuzzy Iterative Learning Control (AFILC) framework for closed-loop neural stimulation, which can realize neuromodulation with no model or model uncertainty. Recognizing the periodic characteristics of neural stimulation and neuronal firing, Iterative Learning Control (ILC) is employed as the primary controller. Furthermore, a fuzzy optimization module is established to update the internal parameters of the ILC controller in real-time. This module enhances the anti-interference ability of the control system and reduces the influence of initial controller parameters on the control process. The efficacy of this strategy is evaluated using a neural computational model. The simulation results validate the capability of the AFILC strategy to suppress epileptic states. Compared with ILC-based closed-loop neurostimulation schemes, the AFILC-based neurostimulation strategy has faster convergence speed and stronger anti-interference ability. Moreover, the control algorithm is implemented based on a digital signal processor, and the hardware-in-the-loop experimental platform is implemented. The experimental results show that the control method has good control performance and computational efficiency, which provides the possibility for future application in clinical research.
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Affiliation(s)
- Tong Li
- School of Electrical and Information Engineering, Tianjin University, Tianjin, 300072 China
| | - Jiang Wang
- School of Electrical and Information Engineering, Tianjin University, Tianjin, 300072 China
| | - Chen Liu
- School of Electrical and Information Engineering, Tianjin University, Tianjin, 300072 China
| | - Shanshan Li
- School of Automation and Electrical Engineering, Tianjin University of Technology and Educations, Tianjin, 300222 China
| | - Kuanchuan Wang
- School of Electrical and Information Engineering, Tianjin University, Tianjin, 300072 China
| | - Siyuan Chang
- School of Electrical and Information Engineering, Tianjin University, Tianjin, 300072 China
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Pradhan A, Mut F, Sosale M, Cebral J. Flow reduction due to arterial catheterization during stroke treatment - A computational study using a distributed compartment model. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2024:e3853. [PMID: 39090842 DOI: 10.1002/cnm.3853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Revised: 06/07/2024] [Accepted: 07/12/2024] [Indexed: 08/04/2024]
Abstract
The effectiveness of various stroke treatments depends on the anatomical variability of the cerebral vasculature, particularly the collateral blood vessel network. Collaterals at the level of the Circle of Willis and distal collaterals, such as the leptomeningeal arteries, serve as alternative avenues of flow when the primary pathway is obstructed during an ischemic stroke. Stroke treatment typically involves catheterization of the primary pathway, and the potential risk of further flow reduction to the affected brain area during this treatment has not been previously investigated. To address this clinical question, we derived the lumped parameters for catheterized blood vessels and implemented a corresponding distributed compartment (0D) model. This 0D model was validated against an experimental model and benchmark test cases solved using a 1D model. Additionally, we compared various off-center catheter trajectories modeled using a 3D solver to this 0D model. The differences between them were minimal, validating the simplifying assumption of the central catheter placement in the 0D model. The 0D model was then used to simulate blood flows in realistic cerebral arterial networks with different collateralization characteristics. Ischemic strokes were modeled by occlusion of the M1 segment of the middle cerebral artery in these networks. Catheters of different diameters were inserted up to the obstructed segment and flow alterations in the network were calculated. Results showed up to 45% maximum blood flow reduction in the affected brain region. These findings suggest that catheterization during stroke treatment may have a further detrimental effect for some patients with poor collateralization.
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Affiliation(s)
- Aseem Pradhan
- Bioengineering Department, George Mason University, Fairfax, Virginia, USA
| | - Fernando Mut
- Bioengineering Department, George Mason University, Fairfax, Virginia, USA
| | - Medhini Sosale
- Bioengineering Department, George Mason University, Fairfax, Virginia, USA
| | - Juan Cebral
- Bioengineering Department, George Mason University, Fairfax, Virginia, USA
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11
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Etienne C, Houssaye A, Fagan MJ, Hutchinson JR. Estimation of the forces exerted on the limb long bones of a white rhinoceros (Ceratotherium simum) using musculoskeletal modelling and simulation. J Anat 2024; 245:240-257. [PMID: 38558391 PMCID: PMC11259748 DOI: 10.1111/joa.14041] [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: 08/23/2023] [Revised: 02/10/2024] [Accepted: 03/10/2024] [Indexed: 04/04/2024] Open
Abstract
Heavy animals incur large forces on their limb bones, due to the transmission of body weight and ground reaction forces, and the contractions of the various muscles of the limbs. This is particularly true for rhinoceroses, the heaviest extant animals capable of galloping. Several studies have examined their musculoskeletal system and the forces their bones incur, but no detailed quantification has ever been attempted. Such quantification could help understand better the link between form and function in giant land animals. Here we constructed three-dimensional musculoskeletal models of the forelimb and hindlimb of Ceratotherium simum, the heaviest extant rhino species, and used static optimisation (inverse) simulations to estimate the forces applied on the bones when standing at rest, including magnitudes and directions. Overall, unsurprisingly, the most active muscles were antigravity muscles, which generate moments opposing body weight (thereby incurring the ground reaction force), and thus keep the joints extended, avoiding joint collapse via flexion. Some muscles have an antigravity action around several joints, and thus were found to be highly active, likely specialised in body weight support (ulnaris lateralis; digital flexors). The humerus was subjected to the greatest amount of forces in terms of total magnitude; forces on the humerus furthermore came from a great variety of directions. The radius was mainly subject to high-magnitude compressive joint reaction forces, but to little muscular tension, whereas the opposite pattern was observed for the ulna. The femur had a pattern similar to that of the humerus, and the tibia's pattern was intermediate, being subject to great compression in its caudal side but to great tension in its cranial side (i.e. bending). The fibula was subject to by far the lowest force magnitude. Overall, the forces estimated were consistent with the documented morphofunctional adaptations of C. simum's long bones, which have larger insertion areas for several muscles and a greater robusticity overall than those of lighter rhinos, likely reflecting the intense forces we estimated here. Our estimates of muscle and bone (joint) loading regimes for this giant tetrapod improve the understanding of the links between form and function in supportive tissues and could be extended to other aspects of bone morphology, such as microanatomy.
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Affiliation(s)
- Cyril Etienne
- UMR 7179 Mécanismes adaptatifs et Évolution (MECADEV), Centre National de la Recherche Scientifique, Muséum National d'Histoire NaturelleParisFrance
| | - Alexandra Houssaye
- UMR 7179 Mécanismes adaptatifs et Évolution (MECADEV), Centre National de la Recherche Scientifique, Muséum National d'Histoire NaturelleParisFrance
| | - Michael J. Fagan
- Department of Engineering, Medical and Biological Engineering Research GroupUniversity of HullHullUK
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12
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Ashtiani SZ, Sarabian M, Laksari K, Babaee H. Reconstructing blood flow in data-poor regimes: a vasculature network kernel for Gaussian process regression. J R Soc Interface 2024; 21:20240194. [PMID: 39173147 PMCID: PMC11341099 DOI: 10.1098/rsif.2024.0194] [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: 03/20/2024] [Revised: 05/12/2024] [Accepted: 06/12/2024] [Indexed: 08/24/2024] Open
Abstract
Blood flow reconstruction in the vasculature is important for many clinical applications. However, in clinical settings, the available data are often quite limited. For instance, transcranial Doppler ultrasound is a non-invasive clinical tool that is commonly used in clinical settings to measure blood velocity waveforms at several locations. This amount of data is grossly insufficient for training machine learning surrogate models, such as deep neural networks or Gaussian process regression. In this work, we propose a Gaussian process regression approach based on empirical kernels constructed by data generated from physics-based simulations-enabling near-real-time reconstruction of blood flow in data-poor regimes. We introduce a novel methodology to reconstruct the kernel within the vascular network. The proposed kernel encodes both spatiotemporal and vessel-to-vessel correlations, thus enabling blood flow reconstruction in vessels that lack direct measurements. We demonstrate that any prediction made with the proposed kernel satisfies the conservation of mass principle. The kernel is constructed by running stochastic one-dimensional blood flow simulations, where the stochasticity captures the epistemic uncertainties, such as lack of knowledge about boundary conditions and uncertainties in vasculature geometries. We demonstrate the performance of the model on three test cases, namely, a simple Y-shaped bifurcation, abdominal aorta and the circle of Willis in the brain.
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Affiliation(s)
- Shaghayegh Z. Ashtiani
- Department of Mechanical Engineering and Material Science, University of Pittsburgh, Pittsburgh, PA, USA
| | - Mohammad Sarabian
- Department of Biomedical Engineering, University of Arizona, Tucson, AZ, USA
| | - Kaveh Laksari
- Department of Mechanical Engineering, University of California Riverside, Riverside, CA, USA
| | - Hessam Babaee
- Department of Mechanical Engineering and Material Science, University of Pittsburgh, Pittsburgh, PA, USA
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13
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Somerville L, Nagy L. The refurbishment and redistribution of disability equipment from the UK to low- and middle-income countries: a case study focusing on 2016-2021 redistributions to Romania. Disabil Rehabil Assist Technol 2024:1-7. [PMID: 39066516 DOI: 10.1080/17483107.2024.2367717] [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: 08/25/2023] [Revised: 06/06/2024] [Accepted: 06/08/2024] [Indexed: 07/28/2024]
Abstract
The surplus of used disability equipment contributing to waste in the UK and the lack of access to disability equipment in low- and middle-income countries (LMICs) are two issues in need of solution. To address such problems, UK charities refurbish and redistribute used disability equipment to LMICs. To date, there is a scarcity of data on how LMICs could access surplus disability equipment from UK organisations. This study aimed to collate and map out the process by which equipment is refurbished and redistributed from the UK to LMIC's and identify factors which influence the development and sustainability of the partnership. An explorative qualitative case study design was used. Nine semi-structured interviews were conducted with participants from sender (UK) and a receiver (Romania) organisation between January-February 2022, with real-time translation where necessary. Intelligent verbatim transcription was used, and data was analysed using latent thematic analysis. The process of collection, refurbishment and redistribution of disability equipment from the UK to a LMIC organisation was mapped. Three key themes were identified from the interviews: (1) Development out of need; (2) Service development requires an adequate working relationship; (3) Process consolidation and future. Strong, honest and transparent relationships between organisations was identified as underpinning the success of the initiative. Raising service provision standards to meet specific needs of LMIC organisations supports development of suitable equipment prescription. Development of similar partnerships has potential of reducing the inequity gap and waste. Global collaboration and planning are required to address challenges of access to disability equipment in LMICs.
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Affiliation(s)
- Lauren Somerville
- Occupational Therapy, Oxford Brookes University, Oxford, United Kingdom
| | - Liana Nagy
- Occupational Therapy, Oxford Brookes University, Oxford, United Kingdom
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14
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Zorilla R, Ching LL, Elisara T, Kramer K, Nerurkar VR. Re-Emerging, Under-Recognized Zoonotic, and Neglected Tropical Diseases in Hawai'i. Jpn J Infect Dis 2024; 77:187-200. [PMID: 38825457 DOI: 10.7883/yoken.jjid.2023.476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2024]
Abstract
Hawai'i, the United States' most western geographic state in the Pacific, lies between the North and South American continents and the Indo-Pacific regions, including Japan. The tropical environmental conditions of the Hawaiian Islands provide favorable ecosystems for various infectious pathogens, their vectors, and reservoirs. This creates an environment conducive to the transmission of zoonotic diseases affecting both humans and animals. Hawai'i has experienced an increase in dengue, leptospirosis, and murine typhus outbreaks. Furthermore, toxoplasmosis and neuroangiostrongyliasis cases remain prevalent throughout the state, and the putative presence of autochthonous Zika cases identified in a retrospective study may be of national public health concern. Understanding the factors that affect the transmission and distribution of zoonoses is necessary to identify at-risk locations and populations. The One Health approach seeks to understand, report, and interpret these factors and requires collaboration between private and governmental institutions. One Health should focus on neglected tropical diseases (NTD) and prioritize development of interventions to control and prevent the transmission of diseases that spread between animals and humans. This review focuses on the epidemiological and clinical characteristics of under-recognized zoonotic and NTD affecting Hawai'i, including leptospirosis, murine typhus, neuroangiostrongyliasis, toxoplasmosis, dengue, and Zika.
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Affiliation(s)
- Rodson Zorilla
- Department of Tropical Medicine, Medical Microbiology, and Pharmacology, John A Burns School of Medicine, University of Hawai'i at Mānoa, USA
- Pacific Center for Emerging Infectious Diseases, John A Burns School of Medicine, University of Hawai'i at Mānoa, USA
- Minority Health Research Training Program, John A Burns School of Medicine, University of Hawai'i at Mānoa, USA
| | - Lauren Lei Ching
- Department of Tropical Medicine, Medical Microbiology, and Pharmacology, John A Burns School of Medicine, University of Hawai'i at Mānoa, USA
- Pacific Center for Emerging Infectious Diseases, John A Burns School of Medicine, University of Hawai'i at Mānoa, USA
| | - Tiana Elisara
- Department of Tropical Medicine, Medical Microbiology, and Pharmacology, John A Burns School of Medicine, University of Hawai'i at Mānoa, USA
- Pacific Center for Emerging Infectious Diseases, John A Burns School of Medicine, University of Hawai'i at Mānoa, USA
- Minority Health Research Training Program, John A Burns School of Medicine, University of Hawai'i at Mānoa, USA
| | - Kenton Kramer
- Department of Tropical Medicine, Medical Microbiology, and Pharmacology, John A Burns School of Medicine, University of Hawai'i at Mānoa, USA
| | - Vivek Ramchandra Nerurkar
- Department of Tropical Medicine, Medical Microbiology, and Pharmacology, John A Burns School of Medicine, University of Hawai'i at Mānoa, USA
- Pacific Center for Emerging Infectious Diseases, John A Burns School of Medicine, University of Hawai'i at Mānoa, USA
- Minority Health Research Training Program, John A Burns School of Medicine, University of Hawai'i at Mānoa, USA
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15
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Lai JM, Chen J, Navia JC, Durkee H, Gonzalez A, Rowaan C, Arcari T, Aguilar MC, Llanes K, Ziebarth N, Martinez JD, Miller D, Flynn HW, Amescua G, Parel JM. Enhancing Rose Bengal penetration in ex vivo human corneas using iontophoresis. Ther Deliv 2024:1-9. [PMID: 39023301 DOI: 10.1080/20415990.2024.2371778] [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: 05/02/2024] [Accepted: 06/20/2024] [Indexed: 07/20/2024] Open
Abstract
Aim: Rose Bengal photodynamic antimicrobial therapy (RB-PDAT) has poor corneal penetration, limiting its efficacy against acanthamoeba keratitis (AK). Iontophoresis enhances corneal permeation of charged molecules, piquing interest in its effects on RB in ex vivo human corneas. Methods: Five donor whole globes each underwent iontophoresis with RB, soaking in RB, or were soaked in normal saline (controls). RB penetration and corneal thickness was assessed using confocal microscopy. Results: Iontophoresis increased RB penetration compared with soaking (177 ± 9.5 μm vs. 100 ± 5.7 μm, p < 0.001), with no significant differences in corneal thickness between groups (460 ± 87 μm vs. 407 ± 69 μm, p = 0.432). Conclusion: Iontophoresis significantly improves RB penetration and its use in PDAT could offer a novel therapy for acanthamoeba keratitis. Further studies are needed to validate clinical efficacy.
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Affiliation(s)
- James M Lai
- Ophthalmic Biophysics Center, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Justin Chen
- Ophthalmic Biophysics Center, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Juan Carlos Navia
- Ophthalmic Biophysics Center, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Heather Durkee
- Ophthalmic Biophysics Center, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Alex Gonzalez
- Ophthalmic Biophysics Center, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Cornelis Rowaan
- Ophthalmic Biophysics Center, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Timothy Arcari
- Ophthalmic Biophysics Center, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
- Department of Biomedical Engineering, University of Miami, Coral Gables, FL 33146, USA
| | - Mariela C Aguilar
- Ophthalmic Biophysics Center, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | | | - Noel Ziebarth
- Department of Biomedical Engineering, University of Miami, Coral Gables, FL 33146, USA
| | - Jaime D Martinez
- Anne Bates Leach Eye Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Darlene Miller
- Anne Bates Leach Eye Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL 33136, USA
- Ocular Microbiology Laboratory, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Harry W Flynn
- Anne Bates Leach Eye Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL 33136, USA
- Ocular Microbiology Laboratory, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Guillermo Amescua
- Ophthalmic Biophysics Center, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
- Anne Bates Leach Eye Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL 33136, USA
- Ocular Microbiology Laboratory, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Jean-Marie Parel
- Ophthalmic Biophysics Center, Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
- Anne Bates Leach Eye Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL 33136, USA
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16
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Arminio M, Carbonaro D, Morbiducci U, Gallo D, Chiastra C. Fluid-structure interaction simulation of mechanical aortic valves: a narrative review exploring its role in total product life cycle. FRONTIERS IN MEDICAL TECHNOLOGY 2024; 6:1399729. [PMID: 39011523 PMCID: PMC11247014 DOI: 10.3389/fmedt.2024.1399729] [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: 03/12/2024] [Accepted: 06/07/2024] [Indexed: 07/17/2024] Open
Abstract
Over the last years computer modelling and simulation has emerged as an effective tool to support the total product life cycle of cardiovascular devices, particularly in the device preclinical evaluation and post-market assessment. Computational modelling is particularly relevant for heart valve prostheses, which require an extensive assessment of their hydrodynamic performance and of risks of hemolysis and thromboembolic complications associated with mechanically-induced blood damage. These biomechanical aspects are typically evaluated through a fluid-structure interaction (FSI) approach, which enables valve fluid dynamics evaluation accounting for leaflets movement. In this context, the present narrative review focuses on the computational modelling of bileaflet mechanical aortic valves through FSI approach, aiming to foster and guide the use of simulations in device total product life cycle. The state of the art of FSI simulation of heart valve prostheses is reviewed to highlight the variety of modelling strategies adopted in the literature. Furthermore, the integration of FSI simulations in the total product life cycle of bileaflet aortic valves is discussed, with particular emphasis on the role of simulations in complementing and potentially replacing the experimental tests suggested by international standards. Simulations credibility assessment is also discussed in the light of recently published guidelines, thus paving the way for a broader inclusion of in silico evidence in regulatory submissions. The present narrative review highlights that FSI simulations can be successfully framed within the total product life cycle of bileaflet mechanical aortic valves, emphasizing that credible in silico models evaluating the performance of implantable devices can (at least) partially replace preclinical in vitro experimentation and support post-market biomechanical evaluation, leading to a reduction in both time and cost required for device development.
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Affiliation(s)
| | | | | | | | - Claudio Chiastra
- PoliToMed Lab, Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Turin, Italy
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17
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Neidlin M, Amiri A, Hugenroth K, Steinseifer U. Investigations of Differential Hypoxemia During Venoarterial Membrane Oxygenation with and Without Impella Support. Cardiovasc Eng Technol 2024:10.1007/s13239-024-00739-w. [PMID: 38937386 DOI: 10.1007/s13239-024-00739-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 06/07/2024] [Indexed: 06/29/2024]
Abstract
PURPOSE Venoarterial extracorporeal membrane oxygenation (VA ECMO) is used in patients with refractory cardiac or cardio-pulmonary failure. Native ventricular output interacts with VA ECMO flow and may hinder sufficient oxygenation to the heart and the brain. Further on, VA ECMO leads to afterload increase requiring ventricular unloading. The aim of the study was to investigate aortic blood flow and oxygenation for various ECMO settings and cannula positions with a numerical model. METHODS Four different aortic cannula tip positions (ascending aorta, descending aorta, abdominal aorta, and iliac artery) were included in a model of a human aorta. Three degrees of cardiac dysfunction and VA ECMO support (50%, 75% and 90%) with a total blood flow of 6 l/min were investigated. Additionally, the Impella CP device was implemented under 50% support condition. Blood oxygen saturation at the aortic branches and the pressure acting on the aortic valve were calculated. RESULTS A more proximal tip orientation is necessary to increase oxygen supply to the supra-aortic and coronary arteries for 50% and 75% support. During the 90% support scenario, proper oxygenation can be achieved independently of tip position. The use of Impella reduces afterload by 8-17 mmHg and vessel oxygenation is similar to 50% VA ECMO support. Pressure load on the aortic valve increases with more proximal tip position and is decreased during Impella use. CONCLUSIONS We present a simulation model for the investigation of hemodynamics and blood oxygenation with various mechanical circulatory support systems. Our results underline the intricate and patient-specific relationship between extracorporeal support, cannula tip orientation and oxygenation capacity.
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Affiliation(s)
- Michael Neidlin
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Medical Faculty, RWTH Aachen University, Forckenbeckstr. 55, 52074, Aachen, Germany.
| | - Ali Amiri
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Medical Faculty, RWTH Aachen University, Forckenbeckstr. 55, 52074, Aachen, Germany
| | | | - Ulrich Steinseifer
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Medical Faculty, RWTH Aachen University, Forckenbeckstr. 55, 52074, Aachen, Germany
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18
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Pantoja JL, Shehadeh TS, Lee MM, Eldredge JD, Kiang SC. Geometrical Factors Affect Wall Shear Stress in Saccular Aneurysms of the Infrarenal Abdominal Aorta. Ann Vasc Surg 2024; 108:76-83. [PMID: 38942368 DOI: 10.1016/j.avsg.2024.04.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Accepted: 04/06/2024] [Indexed: 06/30/2024]
Abstract
BACKGROUND Low wall shear stress (WSS) is predictive of aortic aneurysm growth and rupture. Yet, estimating WSS in a clinical setting is impractical, whereas measuring aneurysm geometry is feasible. This study investigates the association between saccular aneurysm geometry of the infrarenal aorta and WSS. METHODS Starting with a nonaneurysmal, patient-specific, computational fluid dynamics model of the aorta, saccular aneurysms of varying geometry were created by incrementally increasing the neck width and sac depth from 1 cm to 4 cm. The aspect ratio (the ratio between sac depth and neck width) varied between 0.25 and 4. The peak WSS, time-averaged WSS (TAWSS), and oscillatory shear index (OSI) were measured within the aneurysm sac. RESULTS Decreasing the neck width from 4 cm to 1 cm decreased the peak WSS by 69% and the TAWSS by 83%. Increasing the sac depth from 1 cm to 4 cm decreased the peak WSS by 55% and the OSI by 37%. The aspect ratio was negatively correlated to peak WSS (Rs -0.85; P < 0.001). CONCLUSIONS In saccular aneurysms of the infrarenal aorta, a smaller neck width, deeper aneurysm sac, and larger aspect ratio are associated with lower peak WSS.
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Affiliation(s)
- Joe Luis Pantoja
- Division of Vascular Surgery, VA Loma Linda Healthcare System, Loma Linda, CA.
| | - Thaer S Shehadeh
- Division of Vascular Surgery, VA Loma Linda Healthcare System, Loma Linda, CA
| | - Mary M Lee
- Division of Vascular Surgery, VA Loma Linda Healthcare System, Loma Linda, CA
| | - Jeffrey D Eldredge
- Department of Mechanical & Aerospace Engineering, University of California, Los Angeles, CA
| | - Sharon C Kiang
- Division of Vascular Surgery, VA Loma Linda Healthcare System, Loma Linda, CA
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19
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Arefin NM, Good BC. Investigation of cardiopulmonary bypass parameters on embolus transport in a patient-specific aorta. Biomech Model Mechanobiol 2024:10.1007/s10237-024-01867-x. [PMID: 38884891 DOI: 10.1007/s10237-024-01867-x] [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: 03/12/2024] [Accepted: 06/05/2024] [Indexed: 06/18/2024]
Abstract
Neurological complexities resulting from surgery requiring cardiopulmonary bypass (CPB) remain a major concern, encompassing a spectrum of complications including thromboembolic stroke and various cognitive impairments. Surgical manipulation during CPB is considered the primary cause of these neurological complications. This study addresses the overall lack of knowledge concerning CPB hemodynamics within the aorta, employing a combined experimental-computational modeling approach, featuring computational fluid dynamics simulations validated with an in vitro CPB flow loop under steady conditions. Parametric studies were systematically performed, varying parameters associated with CPB techniques (pump flow rate and hemodiluted blood viscosity) and properties related to formed emboli (size and density). This represents the first comprehensive investigation into the individual and combined effects of these factors. Our findings reveal critical insights into the operating conditions of CPB, indicating a positive correlation between pump flow rate and emboli transport into the aortic branches, potentially increasing the risk of stroke. It was also found that larger emboli were more often transported into the aortic branches at higher pump flow rates, while smaller emboli preferred lower flow rates. Further, as blood is commonly diluted during CPB to decrease its viscosity, more emboli were found to enter the aortic branches with greater hemodilution. The combined effects of these parameters are captured using the non-dimensional Stokes number, which was found to positively correlate with emboli transport into the aortic branches. These findings contribute to our understanding of embolic stroke risk factors during CPB and shed light on the complex interplay between CPB parameters.
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Affiliation(s)
- Nafis M Arefin
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN, USA
| | - Bryan C Good
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN, USA.
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20
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Yao J, Crockett J, D'Souza M, A Day G, K Wilcox R, C Jones A, Mengoni M. Effect of meniscus modelling assumptions in a static tibiofemoral finite element model: importance of geometry over material. Biomech Model Mechanobiol 2024; 23:1055-1065. [PMID: 38349433 PMCID: PMC11101373 DOI: 10.1007/s10237-024-01822-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: 10/16/2023] [Accepted: 01/06/2024] [Indexed: 05/18/2024]
Abstract
Finite element studies of the tibiofemoral joint have increased use in research, with attention often placed on the material models. Few studies assess the effect of meniscus modelling assumptions in image-based models on contact mechanics outcomes. This work aimed to assess the effect of modelling assumptions of the meniscus on knee contact mechanics and meniscus kinematics. A sensitivity analysis was performed using three specimen-specific tibiofemoral models and one generic knee model. The assumptions in representing the meniscus attachment on the tibia (shape of the roots and position of the attachment), the material properties of the meniscus, the shape of the meniscus and the alignment of the joint were evaluated, creating 40 model instances. The values of material parameters for the meniscus and the position of the root attachment had a small influence on the total contact area but not on the meniscus displacement or the force balance between condyles. Using 3D shapes to represent the roots instead of springs had a large influence in meniscus displacement but not in knee contact area. Changes in meniscus shape and in knee alignment had a significantly larger influence on all outcomes of interest, with differences two to six times larger than those due to material properties. The sensitivity study demonstrated the importance of meniscus shape and knee alignment on meniscus kinematics and knee contact mechanics, both being more important than the material properties or the position of the roots. It also showed that differences between knees were large, suggesting that clinical interpretations of modelling studies using single geometries should be avoided.
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Affiliation(s)
- Jiacheng Yao
- Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK
| | - John Crockett
- Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK
| | - Mathias D'Souza
- Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK
| | - Gavin A Day
- Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK
| | - Ruth K Wilcox
- Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK
| | - Alison C Jones
- Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK
| | - Marlène Mengoni
- Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK.
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21
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Procopio AC, Colletta S, Laratta E, Mellace M, Tilocca B, Ceniti C, Urbani A, Roncada P. Integrated One Health strategies in Dengue. One Health 2024; 18:100684. [PMID: 39010969 PMCID: PMC11247296 DOI: 10.1016/j.onehlt.2024.100684] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 01/24/2024] [Indexed: 07/17/2024] Open
Abstract
Zoonoses have rapidly spread globally, necessitating the implementation of vaccination strategies as a control measure. Emerging and re-emerging vector-borne diseases are among the major global public health concerns. Dengue, a zoonotic viral infection transmitted to humans by a vector, the Aedes mosquito, is a severe global health problem. Dengue is a serious tropical infectious disease, second only to malaria, causing around 25,000 deaths each year. The resurgence of Dengue is mainly due to climate change, demographic transitions and evolving social dynamics. The development of an effective vaccine against Dengue has proven to be a complex undertaking due to four different viral serotypes with distinct antigenic profiles. This review highlights the urgent need to address the dengue threat by exploring the application of biotechnological and -OMICS sciences.
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Affiliation(s)
- Anna Caterina Procopio
- Department of Health Sciences, University Magna Graecia of Catanzaro, viale Europa, 88100 Catanzaro, Italy
| | - Simona Colletta
- Department of Health Sciences, University Magna Graecia of Catanzaro, viale Europa, 88100 Catanzaro, Italy
| | - Emanuela Laratta
- Department of Health Sciences, University Magna Graecia of Catanzaro, viale Europa, 88100 Catanzaro, Italy
| | - Matteo Mellace
- Department of Health Sciences, University Magna Graecia of Catanzaro, viale Europa, 88100 Catanzaro, Italy
| | - Bruno Tilocca
- Department of Health Sciences, University Magna Graecia of Catanzaro, viale Europa, 88100 Catanzaro, Italy
| | - Carlotta Ceniti
- Department of Health Sciences, University Magna Graecia of Catanzaro, viale Europa, 88100 Catanzaro, Italy
| | - Andrea Urbani
- Department of Diagnostic and Laboratory Medicine, Unity of Chemistry, Biochemistry and Clinical Molecular Biology, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
- Department of Basic Biotechnological Sciences, Intensive Care and Perioperative Clinics Research, Catholic University of the Sacred Heart, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Paola Roncada
- Department of Health Sciences, University Magna Graecia of Catanzaro, viale Europa, 88100 Catanzaro, Italy
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22
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Berggren CC, Jiang D, Jack Wang YF, Bergquist JA, Rupp LC, Liu Z, MacLeod RS, Narayan A, Timmins LH. Influence of material parameter variability on the predicted coronary artery biomechanical environment via uncertainty quantification. Biomech Model Mechanobiol 2024; 23:927-940. [PMID: 38361087 PMCID: PMC11102342 DOI: 10.1007/s10237-023-01814-2] [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: 09/02/2023] [Accepted: 12/30/2023] [Indexed: 02/17/2024]
Abstract
Central to the clinical adoption of patient-specific modeling strategies is demonstrating that simulation results are reliable and safe. Indeed, simulation frameworks must be robust to uncertainty in model input(s), and levels of confidence should accompany results. In this study, we applied a coupled uncertainty quantification-finite element (FE) framework to understand the impact of uncertainty in vascular material properties on variability in predicted stresses. Univariate probability distributions were fit to material parameters derived from layer-specific mechanical behavior testing of human coronary tissue. Parameters were assumed to be probabilistically independent, allowing for efficient parameter ensemble sampling. In an idealized coronary artery geometry, a forward FE model for each parameter ensemble was created to predict tissue stresses under physiologic loading. An emulator was constructed within the UncertainSCI software using polynomial chaos techniques, and statistics and sensitivities were directly computed. Results demonstrated that material parameter uncertainty propagates to variability in predicted stresses across the vessel wall, with the largest dispersions in stress within the adventitial layer. Variability in stress was most sensitive to uncertainties in the anisotropic component of the strain energy function. Moreover, unary and binary interactions within the adventitial layer were the main contributors to stress variance, and the leading factor in stress variability was uncertainty in the stress-like material parameter that describes the contribution of the embedded fibers to the overall artery stiffness. Results from a patient-specific coronary model confirmed many of these findings. Collectively, these data highlight the impact of material property variation on uncertainty in predicted artery stresses and present a pipeline to explore and characterize forward model uncertainty in computational biomechanics.
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Affiliation(s)
- Caleb C Berggren
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, USA
| | - David Jiang
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, USA
| | - Y F Jack Wang
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, USA
| | - Jake A Bergquist
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, USA
- Scientific Computing and Imaging Institute, University of Utah, Salt Lake City, UT, USA
- Nora Eccles Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT, USA
| | - Lindsay C Rupp
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, USA
- Scientific Computing and Imaging Institute, University of Utah, Salt Lake City, UT, USA
- Nora Eccles Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT, USA
| | - Zexin Liu
- Scientific Computing and Imaging Institute, University of Utah, Salt Lake City, UT, USA
- Department of Mathematics, University of Utah, Salt Lake City, UT, USA
| | - Rob S MacLeod
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, USA
- Scientific Computing and Imaging Institute, University of Utah, Salt Lake City, UT, USA
- Nora Eccles Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT, USA
| | - Akil Narayan
- Scientific Computing and Imaging Institute, University of Utah, Salt Lake City, UT, USA
- Department of Mathematics, University of Utah, Salt Lake City, UT, USA
| | - Lucas H Timmins
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, USA.
- Scientific Computing and Imaging Institute, University of Utah, Salt Lake City, UT, USA.
- School of Engineering Medicine, Texas A&M University, 1020 Holcombe Blvd., Houston, TX, USA.
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA.
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Yao L, Khan SR, Dolmans G, Romme J, Mitra S. High Accuracy Localization for Miniature Ingestible Devices Using Mutual Inductance. IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS 2024; 18:662-678. [PMID: 38306262 DOI: 10.1109/tbcas.2024.3361045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2024]
Abstract
This article demonstrates an inductively coupled high-accuracy localization system for miniature ingestible devices. It utilizes an inductance double capacitances-series capacitance (LCC-S) compensation architecture that enables mutual inductance measurement at primary side that is positioned outside the human body and less constrained by power budget and size than the miniature ingestible. Depending on the secondary circuit architecture, only limited and simple cooperative measurements are needed from the ingestible secondary side, which saves power and area in the miniature device. The errors in the system are modeled thoroughly, providing insights about system require-ments for a particular localization accuracy target for efficient design and to identify key building blocks with large influence on overall performance. The model shows that sub-centimeter localization root-mean-square error (RMSE) can be achieved with a modest external ADC (18bit) using three primary coils and three secondary coils. The localization is verified along a complete small intestine tract with realistic dimensions. The proposed model is verified by simulation and experiment showing that at the selected frequency range up to 5 MHz the body has no influence on the accuracy. The use of 0.9% saline as phantom is proposed which guarantees the analysis validity for all body types.
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24
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Duan Y, Ling J, Feng Z, Ye T, Sun T, Zhu Y. A Survey of Needle Steering Approaches in Minimally Invasive Surgery. Ann Biomed Eng 2024; 52:1492-1517. [PMID: 38530535 DOI: 10.1007/s10439-024-03494-0] [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: 09/11/2023] [Accepted: 03/08/2024] [Indexed: 03/28/2024]
Abstract
In virtue of a curved insertion path inside tissues, needle steering techniques have revealed the potential with the assistance of medical robots and images. The superiority of this technique has been preliminarily verified with several maneuvers: target realignment, obstacle circumvention, and multi-target access. However, the momentum of needle steering approaches in the past decade leads to an open question-"How to choose an applicable needle steering approach for a specific clinical application?" This survey discusses this question in terms of design choices and clinical considerations, respectively. In view of design choices, this survey proposes a hierarchical taxonomy of current needle steering approaches. Needle steering approaches of different manipulations and designs are classified to systematically review the design choices and their influences on clinical treatments. In view of clinical consideration, this survey discusses the steerability and acceptability of the current needle steering approaches. On this basis, the pros and cons of the current needle steering approaches are weighed and their suitable applications are summarized. At last, this survey concluded with an outlook of the needle steering techniques, including the potential clinical applications and future developments in mechanical design.
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Affiliation(s)
- Yuzhou Duan
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
| | - Jie Ling
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
| | - Zhao Feng
- School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China
- Wuhan University Shenzhen Research Institute, Shenzhen, 518057, China
| | - Tingting Ye
- Industrial and Systems Engineering Department, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
| | - Tairen Sun
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China
| | - Yuchuan Zhu
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
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25
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Pham J, Kong F, James DL, Marsden AL. Virtual Shape-Editing of Patient-Specific Vascular Models Using Regularized Kelvinlets. IEEE Trans Biomed Eng 2024; 71:1913-1925. [PMID: 38300772 PMCID: PMC11138343 DOI: 10.1109/tbme.2024.3355307] [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] [Indexed: 02/03/2024]
Abstract
OBJECTIVE Cardiovascular diseases, and the interventions performed to treat them, can lead to changes in the shape of patient vasculatures and their hemodynamics. Computational modeling and simulations of patient-specific vascular networks are increasingly used to quantify these hemodynamic changes, but they require modifying the shapes of the models. Existing methods to modify these shapes include editing 2D lumen contours prescribed along vessel centerlines and deforming meshes with geometry-based approaches. However, these methods can require extensive by-hand prescription of the desired shapes and often do not work robustly across a range of vascular anatomies. To overcome these limitations, we develop techniques to modify vascular models using physics-based principles that can automatically generate smooth deformations and readily apply them across different vascular anatomies. METHODS We adapt Regularized Kelvinlets, analytical solutions to linear elastostatics, to perform elastic shape-editing of vascular models. The Kelvinlets are packaged into three methods that allow us to artificially create aneurysms, stenoses, and tortuosity. RESULTS Our methods are able to generate such geometric changes across a wide range of vascular anatomies. We demonstrate their capabilities by creating sets of aneurysms, stenoses, and tortuosities with varying shapes and sizes on multiple patient-specific models. CONCLUSION Our Kelvinlet-based deformers allow us to edit the shape of vascular models, regardless of their anatomical locations, and parametrically vary the size of the geometric changes. SIGNIFICANCE These methods will enable researchers to more easily perform virtual-surgery-like deformations, computationally explore the impact of vascular shape on patient hemodynamics, and generate synthetic geometries for data-driven research.
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26
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Khirani S, Ducrot V. Mask interfaces and devices for home noninvasive ventilation in children. Pediatr Pulmonol 2024; 59:1528-1540. [PMID: 38546008 DOI: 10.1002/ppul.26984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 03/10/2024] [Accepted: 03/13/2024] [Indexed: 05/28/2024]
Abstract
Home noninvasive ventilation (NIV), including continuous (CPAP) and bilevel (BPAP) positive airway pressure, is increasingly used in children worldwide. In this narrative review, we present a comprehensive summary of the equipment available for home NIV in pediatrics, excluding neonates. NIV may be challenging in young children, as the majority of the equipment has been developed for adults. Regarding the interfaces, only a few masks have been specifically developed for young children in recent years, while older children may benefit from a large variety of interfaces. Even though much progress has been made, skin injuries are still present, and need to be managed rapidly. Several studies addressed the management of the side effects, but recent studies are lacking regarding orofacial anomalies. No recent study reported the available interfaces for young children and the strategies for an optimal mask fit. Regarding the devices, an adapted NIV device to pediatrics that allows an adequate patient's breathing detection should guarantee optimal ventilatory efficiency and monitoring of NIV. A close follow-up and regular monitoring should be mandatory to rule out the potential issues, optimize NIV therapy and ascertain the efficacy of NIV. However, studies are lacking to guide the choice of devices in young children and the optimal management of home NIV in pediatrics. We summarized the characteristics of the different interfaces available for young children and the limitations of NIV devices. We finally addressed potential areas for future research on long-term home NIV in children.
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Affiliation(s)
- Sonia Khirani
- ASV Santé, Gennevilliers
- Pediatric noninvasive ventilation and sleep unit, AP-HP Necker Hospital, Paris
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27
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McDonald RC, Fischer AH, Rusckowski M. Oxygen Sensor-Guided Fine Needle Biopsy Studies of Human Cancer Xenografts in Mice. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.27.596060. [PMID: 38854036 PMCID: PMC11160627 DOI: 10.1101/2024.05.27.596060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
An oxygen sensor-mounted fine-needle biopsy tool was used for in vivo measurement of oxygen levels in tumor xenografts. The system provides a means of measuring the oxygen content in harvested tumor tissue from specific locations. Oxygen in human tumor xenografts in a murine model was observed for over 1 min. Tissues were mapped in relation to oxygen tension (pO2) readings and sampled for conventional cytological examination. Careful modeling of the pO2 readings over 60 seconds yielded a diffusion coefficient for oxygen at the sensor tip, providing additional diagnostic information about the tissue before sampling. Oxygen level measurement may provide a useful adjunct to the use of biomarkers in tumor diagnosis.
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Affiliation(s)
| | | | - Mary Rusckowski
- University of Massachusetts Medical School, Associate Professor, Department of Radiology
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28
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Rock CG, Kwak ST, Luo A, Yang X, Yun K, Chang YH. Realizing the gravity of the simulation: adaptation to simulated hypogravity leads to altered predictive control. Front Physiol 2024; 15:1397016. [PMID: 38854629 PMCID: PMC11157081 DOI: 10.3389/fphys.2024.1397016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Accepted: 05/06/2024] [Indexed: 06/11/2024] Open
Abstract
Accurate predictive abilities are important for a wide variety of animal behaviors. Inherent to many of these predictions is an understanding of the physics that underlie the behavior. Humans are specifically attuned to the physics on Earth but can learn to move in other environments (e.g., the surface of the Moon). However, the adjustments made to their physics-based predictions in the face of altered gravity are not fully understood. The current study aimed to characterize the locomotor adaptation to a novel paradigm for simulated reduced gravity. We hypothesized that exposure to simulated hypogravity would result in updated predictions of gravity-based movement. Twenty participants took part in a protocol that had them perform vertically targeted countermovement jumps before (PRE), during, and after (POST) a physical simulation of hypogravity. Jumping in simulated hypogravity had different neuromechanics from the PRE condition, with reduced ground impulses (p ≤ .009) and muscle activity prior to the time of landing (i.e., preactivation; p ≤ .016). In the 1 g POST condition, muscle preactivation remained reduced (p ≤ .033) and was delayed (p ≤ .008) by up to 33% for most muscles of the triceps surae, reflecting an expectation of hypogravity. The aftereffects in muscle preactivation, along with little-to-no change in muscle dynamics during ground contact, point to a neuromechanical adaptation that affects predictive, feed-forward systems over feedback systems. As such, we conclude that the neural representation, or internal model, of gravity is updated after exposure to simulated hypogravity.
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Affiliation(s)
- Chase G. Rock
- Comparative Neuromechanics Laboratory, School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, United States
| | | | | | | | | | - Young-Hui Chang
- Comparative Neuromechanics Laboratory, School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, United States
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29
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Hrnčiřík F, Nagy L, Grimes HL, Iftikhar H, Muzaffar J, Bance M. Impact of Insertion Speed, Depth, and Robotic Assistance on Cochlear Implant Insertion Forces and Intracochlear Pressure: A Scoping Review. SENSORS (BASEL, SWITZERLAND) 2024; 24:3307. [PMID: 38894099 PMCID: PMC11174543 DOI: 10.3390/s24113307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 05/13/2024] [Accepted: 05/14/2024] [Indexed: 06/21/2024]
Abstract
Cochlear implants are crucial for addressing severe-to-profound hearing loss, with the success of the procedure requiring careful electrode placement. This scoping review synthesizes the findings from 125 studies examining the factors influencing insertion forces (IFs) and intracochlear pressure (IP), which are crucial for optimizing implantation techniques and enhancing patient outcomes. The review highlights the impact of variables, including insertion depth, speed, and the use of robotic assistance on IFs and IP. Results indicate that higher insertion speeds generally increase IFs and IP in artificial models, a pattern not consistently observed in cadaveric studies due to variations in methodology and sample size. The study also explores the observed minimal impact of robotic assistance on reducing IFs compared to manual methods. Importantly, this review underscores the need for a standardized approach in cochlear implant research to address inconsistencies and improve clinical practices aimed at preserving hearing during implantation.
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Affiliation(s)
- Filip Hrnčiřík
- Cambridge Hearing Group, Cambridge CB2 7EF, UK; (F.H.)
- Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK
| | - Leo Nagy
- Clinical School, University of Cambridge, Cambridge CB2 0QQ, UK
| | | | - Haissan Iftikhar
- Department of Otolaryngology, University Hospitals Birmingham, Birmingham B15 2TT, UK
| | - Jameel Muzaffar
- Cambridge Hearing Group, Cambridge CB2 7EF, UK; (F.H.)
- Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK
- Department of Otolaryngology, University Hospitals Birmingham, Birmingham B15 2TT, UK
| | - Manohar Bance
- Cambridge Hearing Group, Cambridge CB2 7EF, UK; (F.H.)
- Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0QQ, UK
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30
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Marbán-Castro E, Muhwava L, Kamau Y, Safary E, Rheeder P, Karsas M, Kemp T, Freitas J, Carrihill M, Dave J, Katambo D, Kimetto J, Allie R, Ndungu J, Sigwebela N, Akach D, Girdwood S, Erkosar B, Nichols BE, Haldane C, Vetter B, Shilton S. Implementation research: a protocol for two three-arm pragmatic randomised controlled trials on continuous glucose monitoring devices in people with type 1 diabetes in South Africa and Kenya. Trials 2024; 25:331. [PMID: 38773658 PMCID: PMC11107040 DOI: 10.1186/s13063-024-08132-7] [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: 01/18/2024] [Accepted: 04/22/2024] [Indexed: 05/24/2024] Open
Abstract
BACKGROUND Self-monitoring of glucose is an essential component of type 1 diabetes (T1D) management. In recent years, continuous glucose monitoring (CGM) has provided an alternative to daily fingerstick testing for the optimisation of insulin dosing and general glucose management in people with T1D. While studies have been conducted to evaluate the impact of CGM on clinical outcomes in the US, Europe and Australia, there are limited data available for low- and middle-income countries (LMICs) and further empirical evidence is needed to inform policy decision around their use in these countries. METHODS This trial was designed as a pragmatic, parallel-group, open-label, multicentre, three-arm, randomised (1:1:1) controlled trial of continuous or periodic CGM device use versus standard of care in people with T1D in South Africa and Kenya. The primary objective of this trial will be to assess the impact of continuous or periodic CGM device use on glycaemic control as measured by change from baseline glycosylated haemoglobin (HbA1c). Additional assessments will include clinical outcomes (glucose variation, time in/below/above range), safety (adverse events, hospitalisations), quality of life (EQ-5D, T1D distress score, Glucose Monitoring Satisfaction Survey for T1D), and health economic measures (incremental cost-effectiveness ratios, quality adjusted life years). DISCUSSION This trial aims to address the substantial evidence gap on the impact of CGM device use on clinical outcomes in LMICs, specifically South Africa and Kenya. The trial results will provide evidence to inform policy and treatment decisions in these countries. TRIAL REGISTRATION NCT05944731 (Kenya), July 6, 2023; NCT05944718 (South Africa), July 13, 2023.
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Affiliation(s)
| | - Lorrein Muhwava
- FIND, Campus Biotech, Chemin Des Mines 9, 1202, Geneva, Switzerland
| | - Yvonne Kamau
- FIND, Campus Biotech, Chemin Des Mines 9, 1202, Geneva, Switzerland
| | - Elvis Safary
- FIND, Campus Biotech, Chemin Des Mines 9, 1202, Geneva, Switzerland
| | - Paul Rheeder
- University of Pretoria Diabetes Research Centre, Gezina, Pretoria, South Africa
| | - Maria Karsas
- University of Pretoria Diabetes Research Centre, Gezina, Pretoria, South Africa
| | - Tanja Kemp
- University of Pretoria Diabetes Research Centre, Gezina, Pretoria, South Africa
| | - Johanè Freitas
- University of Pretoria Diabetes Research Centre, Gezina, Pretoria, South Africa
| | - Michelle Carrihill
- Red Cross Childrens Hospital, Paediatric Clinic, Cape Town, South Africa
| | - Joel Dave
- Division of Endocrinology, Groote Schuur Hospital and the University of Cape Town, Cape Town, South Africa
| | - Daniel Katambo
- Kenya Diabetes Management and Information Centre, Nairobi, Kenya
| | - Joan Kimetto
- Kenya Diabetes Management and Information Centre, Nairobi, Kenya
| | - Razana Allie
- University of Pretoria Diabetes Research Centre, Gezina, Pretoria, South Africa
| | - Joseph Ndungu
- FIND, Campus Biotech, Chemin Des Mines 9, 1202, Geneva, Switzerland
| | - Ntombi Sigwebela
- FIND, Campus Biotech, Chemin Des Mines 9, 1202, Geneva, Switzerland
| | - Dorcas Akach
- FIND, Campus Biotech, Chemin Des Mines 9, 1202, Geneva, Switzerland
| | - Sarah Girdwood
- FIND, Campus Biotech, Chemin Des Mines 9, 1202, Geneva, Switzerland
| | - Berra Erkosar
- FIND, Campus Biotech, Chemin Des Mines 9, 1202, Geneva, Switzerland
| | - Brooke E Nichols
- FIND, Campus Biotech, Chemin Des Mines 9, 1202, Geneva, Switzerland
| | - Cathy Haldane
- FIND, Campus Biotech, Chemin Des Mines 9, 1202, Geneva, Switzerland
| | - Beatrice Vetter
- FIND, Campus Biotech, Chemin Des Mines 9, 1202, Geneva, Switzerland
| | - Sonjelle Shilton
- FIND, Campus Biotech, Chemin Des Mines 9, 1202, Geneva, Switzerland
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31
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Cao XM, Cheng YQ, Chen MM, Yao SY, Ying AK, Wang XZ, Guo DS, Li Y. Sulfonated Azocalix[4]arene-Modified Metal-Organic Framework Nanosheets for Doxorubicin Removal from Serum. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:864. [PMID: 38786820 PMCID: PMC11124067 DOI: 10.3390/nano14100864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 05/08/2024] [Accepted: 05/14/2024] [Indexed: 05/25/2024]
Abstract
Chemotherapy is one of the most commonly used methods for treating cancer, but its side effects severely limit its application and impair treatment effectiveness. Removing off-target chemotherapy drugs from the serum promptly through adsorption is the most direct approach to minimize their side effects. In this study, we synthesized a series of adsorption materials to remove the chemotherapy drug doxorubicin by modifying MOF nanosheets with sulfonated azocalix[4]arenes. The strong affinity of sulfonated azocalix[4]arenes for doxorubicin results in high adsorption strength (Langmuir adsorption constant = 2.45-5.73 L mg-1) and more complete removal of the drug. The extensive external surface area of the 2D nanosheets facilitates the exposure of a large number of accessible adsorption sites, which capture DOX molecules without internal diffusion, leading to a high adsorption rate (pseudo-second-order rate constant = 0.0058-0.0065 g mg-1 min-1). These adsorbents perform effectively in physiological environments and exhibit low cytotoxicity and good hemocompatibility. These features make them suitable for removing doxorubicin from serum during "drug capture" procedures. The optimal adsorbent can remove 91% of the clinical concentration of doxorubicin within 5 min.
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Affiliation(s)
- Xiao-Min Cao
- College of Chemistry, Nankai University, Tianjin 300071, China; (X.-M.C.); (Y.-Q.C.); (M.-M.C.); (S.-Y.Y.); (A.-K.Y.); (X.-Z.W.)
| | - Yuan-Qiu Cheng
- College of Chemistry, Nankai University, Tianjin 300071, China; (X.-M.C.); (Y.-Q.C.); (M.-M.C.); (S.-Y.Y.); (A.-K.Y.); (X.-Z.W.)
- State Key Laboratory of Elemento-Organic Chemistry, Key Laboratory of Functional Polymer Materials (Ministry of Education), Frontiers Science Center for New Organic Matter, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, China
| | - Meng-Meng Chen
- College of Chemistry, Nankai University, Tianjin 300071, China; (X.-M.C.); (Y.-Q.C.); (M.-M.C.); (S.-Y.Y.); (A.-K.Y.); (X.-Z.W.)
- State Key Laboratory of Elemento-Organic Chemistry, Key Laboratory of Functional Polymer Materials (Ministry of Education), Frontiers Science Center for New Organic Matter, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, China
| | - Shun-Yu Yao
- College of Chemistry, Nankai University, Tianjin 300071, China; (X.-M.C.); (Y.-Q.C.); (M.-M.C.); (S.-Y.Y.); (A.-K.Y.); (X.-Z.W.)
- State Key Laboratory of Elemento-Organic Chemistry, Key Laboratory of Functional Polymer Materials (Ministry of Education), Frontiers Science Center for New Organic Matter, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, China
| | - An-Kang Ying
- College of Chemistry, Nankai University, Tianjin 300071, China; (X.-M.C.); (Y.-Q.C.); (M.-M.C.); (S.-Y.Y.); (A.-K.Y.); (X.-Z.W.)
- State Key Laboratory of Elemento-Organic Chemistry, Key Laboratory of Functional Polymer Materials (Ministry of Education), Frontiers Science Center for New Organic Matter, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, China
| | - Xiu-Zhen Wang
- College of Chemistry, Nankai University, Tianjin 300071, China; (X.-M.C.); (Y.-Q.C.); (M.-M.C.); (S.-Y.Y.); (A.-K.Y.); (X.-Z.W.)
| | - Dong-Sheng Guo
- College of Chemistry, Nankai University, Tianjin 300071, China; (X.-M.C.); (Y.-Q.C.); (M.-M.C.); (S.-Y.Y.); (A.-K.Y.); (X.-Z.W.)
- State Key Laboratory of Elemento-Organic Chemistry, Key Laboratory of Functional Polymer Materials (Ministry of Education), Frontiers Science Center for New Organic Matter, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, China
- Xinjiang Key Laboratory of Novel Functional Materials Chemistry, College of Chemistry, and Environmental Sciences, Kashi University, Kashi 844000, China
| | - Yue Li
- College of Chemistry, Nankai University, Tianjin 300071, China; (X.-M.C.); (Y.-Q.C.); (M.-M.C.); (S.-Y.Y.); (A.-K.Y.); (X.-Z.W.)
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China
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Bartololo MA, Taylor-LaPole AM, Gandhi D, Johnson A, Li Y, Slack E, Stevens I, Turner Z, Weigand JD, Puelz C, Husmeier D, Olufsen MS. Computational framework for the generation of one-dimensional vascular models accounting for uncertainty in networks extracted from medical images. ARXIV 2024:arXiv:2309.08779v3. [PMID: 38313199 PMCID: PMC10836077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/06/2024]
Abstract
One-dimensional (1D) cardiovascular models offer a non-invasive method to answer medical questions, including predictions of wave-reflection, shear stress, functional flow reserve, vascular resistance, and compliance. This model type can predict patient-specific outcomes by solving 1D fluid dynamics equations in geometric networks extracted from medical images. However, the inherent uncertainty in in-vivo imaging introduces variability in network size and vessel dimensions, affecting hemodynamic predictions. Understanding the influence of variation in image-derived properties is essential to assess the fidelity of model predictions. Numerous programs exist to render three-dimensional surfaces and construct vessel centerlines. Still, there is no exact way to generate vascular trees from the centerlines while accounting for uncertainty in data. This study introduces an innovative framework employing statistical change point analysis to generate labeled trees that encode vessel dimensions and their associated uncertainty from medical images. To test this framework, we explore the impact of uncertainty in 1D hemodynamic predictions in a systemic and pulmonary arterial network. Simulations explore hemodynamic variations resulting from changes in vessel dimensions and segmentation; the latter is achieved by analyzing multiple segmentations of the same images. Results demonstrate the importance of accurately defining vessel radii and lengths when generating high-fidelity patient-specific hemodynamics models.
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Affiliation(s)
- Michelle A Bartololo
- Department of Mathematics, North Carolina State University, Raleigh, North Carolina, USA
| | - Alyssa M Taylor-LaPole
- Department of Mathematics, North Carolina State University, Raleigh, North Carolina, USA
| | - Darsh Gandhi
- Department of Mathematics, North Carolina State University, Raleigh, North Carolina, USA
- Department of Mathematics, University of Texas at Arlington, Arlington, TX, USA
| | - Alexandria Johnson
- Department of Mathematics, North Carolina State University, Raleigh, North Carolina, USA
- Department of Mathematics and Statistics, University of South Florida, Tampa, FL, USA
| | - Yaqi Li
- Department of Mathematics, North Carolina State University, Raleigh, North Carolina, USA
- North Carolina School of Science and Mathematics, Durham, NC, USA
| | - Emma Slack
- Department of Mathematics, North Carolina State University, Raleigh, North Carolina, USA
- Department of Mathematics, Colorado State University, Fort Collins, CO, USA
| | - Isaiah Stevens
- Department of Mathematics, North Carolina State University, Raleigh, North Carolina, USA
| | - Zachary Turner
- Department of Mathematics, North Carolina State University, Raleigh, North Carolina, USA
- School of Mathematical and Statistical Sciences, Arizona State University, Tempe, AZ, USA
| | - Justin D Weigand
- Division of Cardiology, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Charles Puelz
- Division of Cardiology, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Dirk Husmeier
- School of Mathematics and Statistics, University of Glasgow, Glasgow, UK
| | - Mette S Olufsen
- Department of Mathematics, North Carolina State University, Raleigh, North Carolina, USA
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Luo S, Meng Q, Li S, Yu H. Research of intent recognition in rehabilitation robots: a systematic review. Disabil Rehabil Assist Technol 2024; 19:1307-1318. [PMID: 36695473 DOI: 10.1080/17483107.2023.2170477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 01/10/2023] [Accepted: 01/16/2023] [Indexed: 01/26/2023]
Abstract
PURPOSE Rehabilitation robots with intent recognition are helping people with dysfunction to enjoy better lives. Many rehabilitation robots with intent recognition have been developed by academic institutions and commercial companies. However, there is no systematic summary about the application of intent recognition in the field of rehabilitation robots. Therefore, the purpose of this paper is to summarize the application of intent recognition in rehabilitation robots, analyze the current status of their research, and provide cutting-edge research directions for colleagues. MATERIALS AND METHODS Literature searches were conducted on Web of Science, IEEE Xplore, ScienceDirect, SpringerLink, and Medline. Search terms included "rehabilitation robot", "intent recognition", "exoskeleton", "prosthesis", "surface electromyography (sEMG)" and "electroencephalogram (EEG)". References listed in relevant literature were further screened according to inclusion and exclusion criteria. RESULTS In this field, most studies have recognized movement intent by kinematic, sEMG, and EEG signals. However, in practical studies, the development of intent recognition in rehabilitation robots is limited by the hysteresis of kinematic signals and the weak anti-interference ability of sEMG and EEG signals. CONCLUSIONS Intent recognition has achieved a lot in the field of rehabilitation robotics but the key factors limiting its development are still timeliness and accuracy. In the future, intent recognition strategy with multi-sensor information fusion may be a good solution.
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Affiliation(s)
- Shengli Luo
- Institute of Rehabilitation Engineering and Technology, University of Shanghai for Science and Technology, Shanghai, China
| | | | - Sujiao Li
- Institute of Rehabilitation Engineering and Technology, University of Shanghai for Science and Technology, Shanghai, China
| | - Hongliu Yu
- Institute of Rehabilitation Engineering and Technology, University of Shanghai for Science and Technology, Shanghai, China
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Szafron JM, Heng EE, Boyd J, Humphrey JD, Marsden AL. Hemodynamics and Wall Mechanics of Vascular Graft Failure. Arterioscler Thromb Vasc Biol 2024; 44:1065-1085. [PMID: 38572650 PMCID: PMC11043008 DOI: 10.1161/atvbaha.123.318239] [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: 09/04/2023] [Accepted: 03/12/2024] [Indexed: 04/05/2024]
Abstract
Blood vessels are subjected to complex biomechanical loads, primarily from pressure-driven blood flow. Abnormal loading associated with vascular grafts, arising from altered hemodynamics or wall mechanics, can cause acute and progressive vascular failure and end-organ dysfunction. Perturbations to mechanobiological stimuli experienced by vascular cells contribute to remodeling of the vascular wall via activation of mechanosensitive signaling pathways and subsequent changes in gene expression and associated turnover of cells and extracellular matrix. In this review, we outline experimental and computational tools used to quantify metrics of biomechanical loading in vascular grafts and highlight those that show potential in predicting graft failure for diverse disease contexts. We include metrics derived from both fluid and solid mechanics that drive feedback loops between mechanobiological processes and changes in the biomechanical state that govern the natural history of vascular grafts. As illustrative examples, we consider application-specific coronary artery bypass grafts, peripheral vascular grafts, and tissue-engineered vascular grafts for congenital heart surgery as each of these involves unique circulatory environments, loading magnitudes, and graft materials.
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Affiliation(s)
- Jason M Szafron
- Departments of Pediatrics (J.M.S., A.L.M.), Stanford University, CA
| | - Elbert E Heng
- Cardiothoracic Surgery (E.E.H., J.B.), Stanford University, CA
| | - Jack Boyd
- Cardiothoracic Surgery (E.E.H., J.B.), Stanford University, CA
| | - Jay D Humphrey
- Department of Biomedical Engineering, Yale University, New Haven, CT (J.D.H.)
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Villanueva-Uy MET, Ostrea EM, Paran AP, Jorge MC, Tan KKG, Uy HG, Faustino EVS, Dizon RO. Development and Safety Trial of the OstreaVent2™ Prototype for Mechanically Ventilated Adult Patients. ACTA MEDICA PHILIPPINA 2024; 58:27-40. [PMID: 38882915 PMCID: PMC11168947 DOI: 10.47895/amp.v58i7.8329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/18/2024]
Abstract
Background With the surge of COVID-19 infections, there were concerns about shortage of mechanical ventilator in several countries including the Philippines. Objective To transform a locally made, low-cost, neonatal ventilator into a volume- and pressure-controlled, adult ventilator and to determine its safe use among ventilated, adult patients at the Philippine General Hospital. Methods The modification of the neonatal ventilator (OstreaVent1) to the adult OstreaVent2 was based on the critical need for adult ventilators, in volume or pressure mode, in the Philippines due to the COVID-19 pandemic. The adult ventilator settings were calibrated and tested for two days to check for consistency and tolerance and then submitted to a third party for certification. Once certified, a safety trial of 10 stable adult patients on mechanical ventilator was conducted. The patients were placed on the OstreaVent2 for four hours while ventilator parameters, patient's vital signs, and arterial blood gases were monitored at baseline, during, and after placement on the OstreaVent2. A post-study chest radiograph was also done to rule out pulmonary complications, particularly atelectasis and pneumothorax. Results The prototype OstreaVent2 received an FDA Certification for Medical Listing after passing its third-party certification. Ten patients (60% male) recruited in the study had a mean age of 39.1 ± 11.6 years. Half of the patients had a diagnosis of non-COVID-19 pneumonia. During the 4-hour study period, the patients while on the OstreaVent2, had stable ventilator settings and most of the variabilities were within the acceptable tolerances. Vital signs were stable and arterial blood gases were within normal limits. One patient developed alar flaring which was relieved by endotracheal tube suctioning. No patient was withdrawn from the study. One patient who was already transferred out of the ICU subsequently deteriorated and died three days after transfer to the stepdown unit from a non-ventilator related cause. Conclusion The new OstreaVent2 is safe to use among adults who need ventilator support. Variabilities in the ventilator's performance were within acceptable tolerances. Clinical and blood gas measurements of the patients were stable while on the ventilator.
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Affiliation(s)
- Maria Esterlita T Villanueva-Uy
- Institute of Child Health and Human Development, National Institutes of Health, University of the Philippines Manila, Manila, Philippines
- Department of Pediatrics, Philippine General Hospital, University of the Philippines Manila, Manila, Philippines
| | - Enrique M Ostrea
- Institute of Child Health and Human Development, National Institutes of Health, University of the Philippines Manila, Manila, Philippines
| | - Alexander P Paran
- Metals Industry and Research Development Center, Department of Science and Technology, Taguig City, Philippines
| | - Manuel C Jorge
- Department of Physiology, College of Medicine, University of the Philippines Manila, Manila, Philippines
| | - Kriselda Karlene G Tan
- Section of Adult Pulmonology, Department of Medicine, Philippine General Hospital, University of the Philippines Manila, Manila, Philippines
| | - Herbert G Uy
- Department of Pediatrics, Philippine General Hospital, University of the Philippines Manila, Manila, Philippines
| | - E Vincent S Faustino
- Department of Pediatrics, Philippine General Hospital, University of the Philippines Manila, Manila, Philippines
- Department of Pediatrics, Yale School of Medicine, New Haven, CT, USA
| | - Robert O Dizon
- Metals Industry and Research Development Center, Department of Science and Technology, Taguig City, Philippines
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Kleist E, Henke P, Ruehrmund L, Kebbach M, Bader R, Woernle C. Impact of Structural Compliance of a Six Degree of Freedom Joint Simulator on Virtual Ligament Force Calculation in Total Knee Endoprosthesis Testing. Life (Basel) 2024; 14:531. [PMID: 38672801 PMCID: PMC11050787 DOI: 10.3390/life14040531] [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: 03/15/2024] [Revised: 04/15/2024] [Accepted: 04/17/2024] [Indexed: 04/28/2024] Open
Abstract
The AMTI VIVO™ six degree of freedom joint simulator allows reproducible preclinical testing of joint endoprostheses under specific kinematic and loading conditions. When testing total knee endoprosthesis, the articulating femoral and tibial components are each mounted on an actuator with two and four degrees of freedom, respectively. To approximate realistic physiological conditions with respect to soft tissues, the joint simulator features an integrated virtual ligament model that calculates the restoring forces of the ligament apparatus to be applied by the actuators. During joint motion, the locations of the ligament insertion points are calculated depending on both actuators' coordinates. In the present study, we demonstrate that unintended elastic deformations of the actuators due to the specifically high contact forces in the artificial knee joint have a considerable impact on the calculated ligament forces. This study aims to investigate the effect of this structural compliance on experimental results. While the built-in algorithm for calculating the ligament forces cannot be altered by the user, a reduction of the ligament force deviations due to the elastic deformations could be achieved by preloading the articulating implant components in the reference configuration. As a proof of concept, a knee flexion motion with varying ligament conditions was simulated on the VIVO simulator and compared to data derived from a musculoskeletal multibody model of a total knee endoprosthesis.
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Affiliation(s)
- Eric Kleist
- Chair of Technical Mechanics/Dynamics, Faculty of Mechanical Engineering and Marine Technologies, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany;
| | - Paul Henke
- Biomechanics and Implant Technology Research Laboratory, Department of Orthopedics, Rostock University Medical Center, Doberaner Straße 142, 18057 Rostock, Germany; (P.H.); (L.R.); (M.K.)
| | - Leo Ruehrmund
- Biomechanics and Implant Technology Research Laboratory, Department of Orthopedics, Rostock University Medical Center, Doberaner Straße 142, 18057 Rostock, Germany; (P.H.); (L.R.); (M.K.)
| | - Maeruan Kebbach
- Biomechanics and Implant Technology Research Laboratory, Department of Orthopedics, Rostock University Medical Center, Doberaner Straße 142, 18057 Rostock, Germany; (P.H.); (L.R.); (M.K.)
| | - Rainer Bader
- Biomechanics and Implant Technology Research Laboratory, Department of Orthopedics, Rostock University Medical Center, Doberaner Straße 142, 18057 Rostock, Germany; (P.H.); (L.R.); (M.K.)
| | - Christoph Woernle
- Chair of Technical Mechanics/Dynamics, Faculty of Mechanical Engineering and Marine Technologies, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany;
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Martelly E, Rana S, Shimada K. Method for evaluating the fit of custom-fit Continuous Positive Airway Pressure masks using finite element analysis. Comput Methods Biomech Biomed Engin 2024:1-18. [PMID: 38607946 DOI: 10.1080/10255842.2024.2341120] [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: 08/31/2023] [Accepted: 04/03/2024] [Indexed: 04/14/2024]
Abstract
Continuous Positive Airway Pressure (CPAP) is a common therapy used to treat breathing disorders such as obstructive sleep apnea. In previous work, we designed a custom-fit CPAP mask to address comfort and leakage issues patients often experience. This paper presents a method to create a finite element (FE) model to evaluate the fit of the custom-fit mask before fabrication. The model includes details such as a skull to represent the variable soft tissue thicknesses on the face, and two strap configurations, original and X. The model was tested on four subjects and results show that the X strap configuration results in a more even stress distribution, measured by standard deviation, on the face compared to the original strap, indicating better fit. The simulations also show gaps in the stress distribution that seem to correspond to areas of leakage based on two initial in vivo tests on two subjects. This simulation method proves to be a valuable tool for custom-fit mask development by allowing us to evaluate designs before fabrication.
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Affiliation(s)
- Erica Martelly
- Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Sandeep Rana
- Department of Neurology, Allegheny General Hospital, Pittsburgh, PA, USA
| | - Kenji Shimada
- Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
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38
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Soldado-Magraner J, Antonietti A, French J, Higgins N, Young MJ, Larrivee D, Monteleone R. Applying the IEEE BRAIN neuroethics framework to intra-cortical brain-computer interfaces. J Neural Eng 2024; 21:022001. [PMID: 38537269 DOI: 10.1088/1741-2552/ad3852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 03/27/2024] [Indexed: 04/05/2024]
Abstract
Objective. Brain-computer interfaces (BCIs) are neuroprosthetic devices that allow for direct interaction between brains and machines. These types of neurotechnologies have recently experienced a strong drive in research and development, given, in part, that they promise to restore motor and communication abilities in individuals experiencing severe paralysis. While a rich literature analyzes the ethical, legal, and sociocultural implications (ELSCI) of these novel neurotechnologies, engineers, clinicians and BCI practitioners often do not have enough exposure to these topics.Approach. Here, we present the IEEE Neuroethics Framework, an international, multiyear, iterative initiative aimed at developing a robust, accessible set of considerations for diverse stakeholders.Main results. Using the framework, we provide practical examples of ELSCI considerations for BCI neurotechnologies. We focus on invasive technologies, and in particular, devices that are implanted intra-cortically for medical research applications.Significance. We demonstrate the utility of our framework in exposing a wide range of implications across different intra-cortical BCI technology modalities and conclude with recommendations on how to utilize this knowledge in the development and application of ethical guidelines for BCI neurotechnologies.
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Affiliation(s)
- Joana Soldado-Magraner
- Department of Electrical and Computer Engineering and the Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States of America
| | - Alberto Antonietti
- Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milano 20131, Italy
| | - Jennifer French
- Neurotech Network, St. Petersburg, FL 33733, United States of America
| | - Nathan Higgins
- School of Psychological Sciences, Monash University, Clayton, VIC 3800, Australia
| | - Michael J Young
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, United States of America
| | - Denis Larrivee
- Mind and Brain Institute, University of Navarra Medical School, Pamplona, Navarra 31008, Spain
- Loyola University, Chicago, IL 60611, United States of America
| | - Rebecca Monteleone
- Disability Studies Program, University of Toledo, Toledo, OH 43606, United States of America
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Lo SCY, McCullough JWS, Xue X, Coveney PV. Uncertainty quantification of the impact of peripheral arterial disease on abdominal aortic aneurysms in blood flow simulations. J R Soc Interface 2024; 21:20230656. [PMID: 38593843 PMCID: PMC11003782 DOI: 10.1098/rsif.2023.0656] [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: 11/07/2023] [Accepted: 03/05/2024] [Indexed: 04/11/2024] Open
Abstract
Peripheral arterial disease (PAD) and abdominal aortic aneurysms (AAAs) often coexist and pose significant risks of mortality, yet their mutual interactions remain largely unexplored. Here, we introduce a fluid mechanics model designed to simulate the haemodynamic impact of PAD on AAA-associated risk factors. Our focus lies on quantifying the uncertainty inherent in controlling the flow rates within PAD-affected vessels and predicting AAA risk factors derived from wall shear stress. We perform a sensitivity analysis on nine critical model parameters through simulations of three-dimensional blood flow within a comprehensive arterial geometry. Our results show effective control of the flow rates using two-element Windkessel models, although specific outlets need attention. Quantities of interest like endothelial cell activation potential (ECAP) and relative residence time are instructive for identifying high-risk regions, with ECAP showing greater reliability and adaptability. Our analysis reveals that the uncertainty in the quantities of interest is 187% of that of the input parameters. Notably, parameters governing the amplitude and frequency of the inlet velocity exert the strongest influence on the risk factors' variability and warrant precise determination. This study forms the foundation for patient-specific simulations involving PAD and AAAs which should ultimately improve patient outcomes and reduce associated mortality rates.
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Affiliation(s)
- Sharp C. Y. Lo
- Centre for Computational Science, University College London, London, UK
| | | | - Xiao Xue
- Centre for Computational Science, University College London, London, UK
| | - Peter V. Coveney
- Centre for Computational Science, University College London, London, UK
- Advanced Research Computing Centre, University College London, London, UK
- Informatics Institute, Faculty of Science, University of Amsterdam, Amsterdam, The Netherlands
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40
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Chen Y, Zhang X, Yang X, Su L, Chen W, Zhao J, Hu Y, Wang Y, Wu Y, Dong Y. PfAgo-Based Zika Virus Detection. Viruses 2024; 16:539. [PMID: 38675882 PMCID: PMC11054744 DOI: 10.3390/v16040539] [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: 02/27/2024] [Revised: 03/26/2024] [Accepted: 03/26/2024] [Indexed: 04/28/2024] Open
Abstract
As a mosquito-borne flavivirus, Zika virus (ZIKV) has been identified as a global health threat. The virus has been linked to severe congenital disabilities, including microcephaly and other congenital malformations, resulting in fatal intrauterine death. Therefore, developing sensitive and specific methods for the early detection and accurate diagnosis of the ZIKV is essential for controlling its spread and mitigating its impact on public health. Herein, we set up a novel nucleic acid detection system based on Pyrococcus furiosus Argonaute (PfAgo)-mediated nucleic acid detection, targeting the non-structural protein 5 (NS5) region of the ZIKV genome (abbreviated ZIKV-PAND). Without preamplification with the polymerase chain reaction (PCR), the minimum detection concentration (MDC) of ZIKV-PAND was about 10 nM. When introducing an amplification step, the MDC can be dramatically decreased to the aM level (8.3 aM), which is comparable to qRT-PCR assay (1.6 aM). In addition, the diagnostic findings from the analysis of simulated clinical samples or Zika virus samples using ZIKV-PAND show a complete agreement of 100% with qRT-PCR assays. This correlation can aid in the implementation of molecular testing for clinical diagnoses and the investigation of ZIKV infection on an epidemiological scale.
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Affiliation(s)
- Yuhao Chen
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, Hubei Key Laboratory of Industrial Biotechnology and Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Xianyi Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, Hubei Key Laboratory of Industrial Biotechnology and Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Xuan Yang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, Hubei Key Laboratory of Industrial Biotechnology and Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Lifang Su
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, Hubei Key Laboratory of Industrial Biotechnology and Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Weiran Chen
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, Hubei Key Laboratory of Industrial Biotechnology and Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Jixiang Zhao
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, Hubei Key Laboratory of Industrial Biotechnology and Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Yunhong Hu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, Hubei Key Laboratory of Industrial Biotechnology and Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Yuan Wang
- School of Basic Medicine, Hubei University of Arts and Sciences, Xiangyang 441053, China
| | - Ying Wu
- State Key Laboratory of Virology and Hubei Province Key Laboratory of Allergy and Immunology, Institute of Medical Virology, TaiKang Medical School (School of Basic Medical Sciences), Wuhan University, Wuhan 430072, China
| | - Yanming Dong
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, Hubei Key Laboratory of Industrial Biotechnology and Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, School of Life Sciences, Hubei University, Wuhan 430062, China
- Hubei Jiangxia Laboratory, Wuhan 430200, China
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Chrysostomidis G, Apostolos A, Papanikolaou A, Konstantinou K, Tsigkas G, Koliopoulou A, Chamogeorgakis T. The Application of Precision Medicine in Structural Heart Diseases: A Step towards the Future. J Pers Med 2024; 14:375. [PMID: 38673001 PMCID: PMC11051532 DOI: 10.3390/jpm14040375] [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: 02/07/2024] [Revised: 03/20/2024] [Accepted: 03/23/2024] [Indexed: 04/28/2024] Open
Abstract
The personalized applications of 3D printing in interventional cardiology and cardiac surgery represent a transformative paradigm in the management of structural heart diseases. This review underscores the pivotal role of 3D printing in enhancing procedural precision, from preoperative planning to procedural simulation, particularly in valvular heart diseases, such as aortic stenosis and mitral regurgitation. The ability to create patient-specific models contributes significantly to predicting and preventing complications like paravalvular leakage, ensuring optimal device selection, and improving outcomes. Additionally, 3D printing extends its impact beyond valvular diseases to tricuspid regurgitation and non-valvular structural heart conditions. The comprehensive synthesis of the existing literature presented here emphasizes the promising trajectory of individualized approaches facilitated by 3D printing, promising a future where tailored interventions based on precise anatomical considerations become standard practice in cardiovascular care.
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Affiliation(s)
- Grigorios Chrysostomidis
- Second Department of Adult Cardiac Surgery—Heart and Lung Transplantation, Onassis Cardiac Surgery Center, 176 74 Athens, Greece; (G.C.); (A.K.); (T.C.)
| | - Anastasios Apostolos
- First Department of Cardiology, National and Kapodistrian University of Athens, Hippocration General Hospital, 115 27 Athens, Greece;
| | - Amalia Papanikolaou
- First Department of Cardiology, National and Kapodistrian University of Athens, Hippocration General Hospital, 115 27 Athens, Greece;
| | - Konstantinos Konstantinou
- Royal Brompton and Harefield Hospitals, Guy’s and St Thomas’ NHS Foundation Trust, London 26504, UK;
| | - Grigorios Tsigkas
- Department of Cardiology, University Hospital of Patras, 265 04 Patras, Greece;
| | - Antigoni Koliopoulou
- Second Department of Adult Cardiac Surgery—Heart and Lung Transplantation, Onassis Cardiac Surgery Center, 176 74 Athens, Greece; (G.C.); (A.K.); (T.C.)
| | - Themistokles Chamogeorgakis
- Second Department of Adult Cardiac Surgery—Heart and Lung Transplantation, Onassis Cardiac Surgery Center, 176 74 Athens, Greece; (G.C.); (A.K.); (T.C.)
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Agrafiotis E, Zimpfer D, Mächler H, Holzapfel GA. Review of Systemic Mock Circulation Loops for Evaluation of Implantable Cardiovascular Devices and Biological Tissues. J Endovasc Ther 2024:15266028241235876. [PMID: 38528650 DOI: 10.1177/15266028241235876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
CLINICAL IMPACT On needs-based ex vivo monitoring of implantable devices or tissues/organs in cardiovascular simulators provides new insights and paves new paths for device prototypes. The insights gained could not only support the needs of patients, but also inform engineers, scientists and clinicians about undiscovered aspects of diseases (during routine monitoring). We analyze seminal and current work and highlight a variety of opportunities for developing preclinical tools that would improve strategies for future implantable devices. Holistically, mock circulation loop studies can bridge the gap between in vivo and in vitro approaches, as well as clinical and laboratory settings, in a mutually beneficial manner.
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Affiliation(s)
| | - Daniel Zimpfer
- Division of Cardiac Surgery, Medical University of Graz, Graz, Austria
| | - Heinrich Mächler
- Division of Cardiac Surgery, Medical University of Graz, Graz, Austria
| | - Gerhard A Holzapfel
- Institute of Biomechanics, Graz University of Technology, Graz, Austria
- Department of Structural Engineering, Norwegian University of Science and Technology, Trondheim, Norway
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Rufus-Membere P, Anderson KB, Holloway-Kew KL, Harland JW, Diez-Perez A, Kotowicz MA, Pasco JA. The practicality of using bone impact microindentation in a population-based study of women: A Geelong-Osteoporosis Study. Bone Rep 2024; 20:101733. [PMID: 38357013 PMCID: PMC10864859 DOI: 10.1016/j.bonr.2023.101733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2023] [Revised: 12/14/2023] [Accepted: 12/30/2023] [Indexed: 02/16/2024] Open
Abstract
Impact microindentation (IMI) is a minimally invasive technique that allows the assessment of bone material strength index (BMSi) in vivo, by measuring the depth of a micron-sized, spherical tip into cortical bone that is then indexed to the depth of the tip into a reference material. In this study, we aimed to assess the practicality of its application in 99 women aged 42-84 yr from the Geelong Osteoporosis Study. Impact microindentation was performed in the mid-shaft of the right tibia using the OsteoProbe. Immediately following measurement, each participant was requested to rate on a Visual Analogue Scale [0-10] the level of discomfort anticipated and experienced, any initial reluctance towards the measurement and whether they were willing to repeat the measurement. Of 99 potential participants who attended this assessment phase, 55 underwent IMI measurement. Reasons for non-measurement in 44 women were existing skin conditions (n = 8, 18.2 %) and excessive soft tissue around mid-tibial region (n = 32, 72.2 %). An additional four (9.1 %) participants did not provide any reasons for declining. For 55 participants who had underwent IMI, the expectation for pain when briefed about the procedure was low (2.28 ± 2.39), as was pain experienced during the measurement (0.72 ± 1.58). Participants were not reluctant to undergo the measurement (0.83 ± 1.67), and all indicated a willingness to repeat the measurement. Results of this study showed that the IMI technique is well tolerated and accepted by women participating in the Geelong Osteoporosis Study, suggesting that the technique shows promise in a research or clinical setting.
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Affiliation(s)
- Pamela Rufus-Membere
- Deakin University, IMPACT- Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Geelong, Australia
| | - Kara B. Anderson
- Deakin University, IMPACT- Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Geelong, Australia
| | - Kara L. Holloway-Kew
- Deakin University, IMPACT- Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Geelong, Australia
| | - Jacob W. Harland
- Deakin University, IMPACT- Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Geelong, Australia
| | - Adolfo Diez-Perez
- Barcelona- Department of Internal Medicine, Hospital del Mar-IMIM, Autonomous University of Barcelona and CIBERFES, Instituto Carlos III, Spain
| | - Mark A. Kotowicz
- Deakin University, IMPACT- Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Geelong, Australia
- Barwon Health, Geelong, Australia
- Department of Medicine-Western Health, The University of Melbourne, St. Albans, Australia
| | - Julie A. Pasco
- Deakin University, IMPACT- Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Geelong, Australia
- Barwon Health, Geelong, Australia
- Department of Medicine-Western Health, The University of Melbourne, St. Albans, Australia
- Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Australia
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Sayas J, Lalmolda C, Corral M, Flórez P, Hernández-Voth A, Janssens JP, Rabec C, Langevin B, Lofaso F, Carlucci A, Llontop C, Winck JC, Bermejo JG, Lujan M. Measurement of thoraco-abdominal synchrony using respiratory inductance plethysmography: technical aspects and a proposal to overcome its limitations. Expert Rev Respir Med 2024; 18:227-236. [PMID: 38829281 DOI: 10.1080/17476348.2024.2363058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 04/12/2024] [Indexed: 06/05/2024]
Abstract
BACKGROUND Thoraco-abdominal asynchrony (TAA) is usually assessed by respiratory inductance plethysmography. The main parameter used for its assessment is the calculation of the phase angle based on Lissajous plots. However, there are some mathematical limitations to its use. RESEARCH DESIGN AND METHODS Sequences of five breaths were selected from a) normal subjects, b) COPD patients, both at rest and during exercise, and c) patients with obstructive apnea syndrome. Automated analysis was performed calculating phase angle, loop rotation (clockwise or counterclockwise), global phase delay and loop area. TAA severity was estimated quantitatively and in subgroups. RESULTS 2290 cycles were analyzed (55% clockwise rotation). Phase angle ranged from -86.90 to + 88.4 degrees, while global phase delay ranged from -179.75 to + 178.54. Despite a good correlation with global phase delay (p < 0.01, ANOVA test), phase angle and loop area were not able to correctly classify breaths with severe deviation and paradoxical movements (p=ns, Bonferroni post hoc test). CONCLUSIONS Global phase delay covers the whole spectrum of TAA situations in a single value. It may be a relevant parameter for diagnosis and follow-up of clinical conditions leading to TAA. CLINICAL TRIAL REGISTRATION The trial from which the traces were obtained was registered at ClinicalTrials.gov ;(identifier: NCT04597606).
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Affiliation(s)
- Javier Sayas
- Pulmonology Service, Hospital Universitario 12 de Octubre, Universidad Complutense de Madrid, Madrid, Spain
| | - Cristina Lalmolda
- Servei de Pneumologia, Parc Taulí Hospital Universitari. Institut d'Investigació i Innovació Parc Taulí (I3PT-CERCA), Universitat Autònoma de Barcelona, Sabadell, Spain
| | - Marta Corral
- Pulmonology Service, Hospital Universitario 12 de Octubre, Universidad Complutense de Madrid, Madrid, Spain
| | - Pablo Flórez
- Servei de Pneumologia, Parc Taulí Hospital Universitari. Institut d'Investigació i Innovació Parc Taulí (I3PT-CERCA), Universitat Autònoma de Barcelona, Sabadell, Spain
| | - Ana Hernández-Voth
- Pulmonology Service, Hospital Universitario 12 de Octubre, Universidad Complutense de Madrid, Madrid, Spain
| | - Jean Paul Janssens
- Division of Pneumology, Geneva University Hospitals, Geneva, Switzerland
- Medicine, University of Geneva, Geneva, Switzerland
| | - Claudio Rabec
- Department of Pulmonary Medicine and Intensive Care Unit. Constitutive Reference Center for Rare Pulmonary Diseases, University Hospital of Dijon Bourgogne, Dijon, France
| | - Bruno Langevin
- Réanimation, Pôle Soins Aigus, Centre Hospitalier Alès, Alès, France
| | - Frédéric Lofaso
- INSERM-UMR 1179, Versailles Saint-Quentin University, Paris Saclay University, France
- Department of Physiology, AP-HP, Hôpital Raymond Poincaré, Garches, France
| | - Annalisa Carlucci
- Dipartimento di Medicina e Chirurgia, Università Insubria Varese-Como. Pneumologia Riabilitativa. Istituti Clinici Scientifici Maugeri-Pavia, Pavia, Italy
| | - Claudia Llontop
- Unité ambulatoire d'appareillage respiratoire de domicile. Département R3S (Respiration Réanimation, Réhabilitation, Sommeil), Groupe hospitalier Pitié-Salpêtrière, Paris, France
| | - Joao Carlos Winck
- UniC Cardiovascular R&D Centre, Faculdade de Medicina da Universidade do Porto, Porto, Portugal
| | - Jesús González Bermejo
- Sorbonne Université, INSERM, UMRS1158 Neurophysiologie Respiratoire Expérimentale et Clinique; AP-HP, Groupe Hospitalier Universitaire APHP-Sorbonne Université, site Pitié-Salpêtrière, Département R3S (Respiration, Réanimation, Réadaptation respiratoire, Sommeil), Service de médecine de readaptation respiratoire, Paris, France
| | - Manel Lujan
- Servei de Pneumologia, Parc Taulí Hospital Universitari. Institut d'Investigació i Innovació Parc Taulí (I3PT-CERCA), Universitat Autònoma de Barcelona, Sabadell, Spain
- CIBERES, Madrid, Spain
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Islam P, Schaly S, Abosalha AK, Boyajian J, Thareja R, Ahmad W, Shum-Tim D, Prakash S. Nanotechnology in development of next generation of stent and related medical devices: Current and future aspects. WILEY INTERDISCIPLINARY REVIEWS. NANOMEDICINE AND NANOBIOTECHNOLOGY 2024; 16:e1941. [PMID: 38528392 DOI: 10.1002/wnan.1941] [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: 07/28/2023] [Revised: 12/08/2023] [Accepted: 01/03/2024] [Indexed: 03/27/2024]
Abstract
Coronary stents have saved millions of lives in the last three decades by treating atherosclerosis especially, by preventing plaque protrusion and subsequent aneurysms. They attenuate the vascular SMC proliferation and promote reconstruction of the endothelial bed to ensure superior revascularization. With the evolution of modern stent types, nanotechnology has become an integral part of stent technology. Nanocoating and nanosurface fabrication on metallic and polymeric stents have improved their drug loading capacity as well as other mechanical, physico-chemical, and biological properties. Nanofeatures can mimic the natural nanofeatures of vascular tissue and control drug-delivery. This review will highlight the role of nanotechnology in addressing the challenges of coronary stents and the recent advancements in the field of related medical devices. Different generations of stents carrying nanoparticle-based formulations like liposomes, lipid-polymer hybrid NPs, polymeric micelles, and dendrimers are discussed highlighting their roles in local drug delivery and anti-restenotic properties. Drug nanoparticles like Paclitaxel embedded in metal stents are discussed as a feature of first-generation drug-eluting stents. Customized precision stents ensure safe delivery of nanoparticle-mediated genes or concerted transfer of gene, drug, and/or bioactive molecules like antibodies, gene mimics via nanofabricated stents. Nanotechnology can aid such therapies for drug delivery successfully due to its easy scale-up possibilities. However, limitations of this technology such as their potential cytotoxic effects associated with nanoparticle delivery that can trigger hypersensitivity reactions have also been discussed in this review. This article is categorized under: Implantable Materials and Surgical Technologies > Nanotechnology in Tissue Repair and Replacement Therapeutic Approaches and Drug Discovery > Nanomedicine for Cardiovascular Disease Therapeutic Approaches and Drug Discovery > Emerging Technologies.
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Affiliation(s)
- Paromita Islam
- Biomedical Technology and Cell Therapy Research Laboratory, Department of Biomedical Engineering, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Sabrina Schaly
- Biomedical Technology and Cell Therapy Research Laboratory, Department of Biomedical Engineering, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Ahmed Kh Abosalha
- Biomedical Technology and Cell Therapy Research Laboratory, Department of Biomedical Engineering, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
- Pharmaceutical Technology Department, Faculty of Pharmacy, Tanta University, Tanta, Egypt
| | - Jacqueline Boyajian
- Biomedical Technology and Cell Therapy Research Laboratory, Department of Biomedical Engineering, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Rahul Thareja
- Biomedical Technology and Cell Therapy Research Laboratory, Department of Biomedical Engineering, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Waqar Ahmad
- Biomedical Technology and Cell Therapy Research Laboratory, Department of Biomedical Engineering, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Dominique Shum-Tim
- Division of Cardiac Surgery, Royal Victoria Hospital, McGill University Health Centre, McGill University, Faculty of Medicine and Health Sciences, Montreal, Quebec, Canada
| | - Satya Prakash
- Biomedical Technology and Cell Therapy Research Laboratory, Department of Biomedical Engineering, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
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Gonzalez-Vargas JM, Sinz E, Moore JZ, Miller SR. Clinical Outcomes of Standardized Central Venous Catheterization Simulation Training: A Comparative Analysis. JOURNAL OF SURGICAL EDUCATION 2024; 81:444-455. [PMID: 38278722 PMCID: PMC10922709 DOI: 10.1016/j.jsurg.2023.11.022] [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: 08/03/2023] [Revised: 10/26/2023] [Accepted: 11/30/2023] [Indexed: 01/28/2024]
Abstract
OBJECTIVE A standardized ultrasound-guided Internal Jugular Central Venous Catheterization (US-IJCVC) using online- and simulation-based training was first designed and then large-scale deployed at a teaching hospital institution to improve CVC surgical education. To understand the impact that the standardized training might have on patient complications, this study focuses on identifying the impact of the integration of an iteratively designed US-IJCVC training on clinical complications at a teaching hospital. DESIGN AND PARTICIPANTS A comparative study was conducted using TriNetX, a global health research network. Using Current Procedural Terminology (CPT) codes and the International Statistical Classification of Diseases and Related Health Problems (ICD-10) codes, we identified the total number of patients with a CVC and mechanical, infectious, and thrombosis complications with and without billable ultrasound between July 1 to June 30 in 2016, 2017, and 2022. SETTING A teaching hospital institution in Pennsylvania. RESULTS Results showed a correlation between years and complications indicating, (1) mechanical complications billable ultrasound, (2) infectious complications billable ultrasound, and (3) thrombosis complications billable ultrasound were significantly lower with the large-scale deployment. Results also showed that (4) mechanical, infectious, and thrombosis complications with and without billable ultrasound are within the range that prior work has reported. CONCLUSION These results indicate that there has been a decrease in mechanical, infectious, and thrombosis complications, which correlates with the US-IJCVC training large-scale deployment.
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Affiliation(s)
| | - Elizabeth Sinz
- Department of Anesthesiology and Perioperative Medicine, Penn State Health Milton S. Hershey Medical Center, Hershey, Pennsylvania; Department of Neurosurgery, Penn State Health Milton S. Hershey Medical Center, Hershey, Pennsylvania
| | - Jason Z Moore
- Department of Mechanical and Nuclear Engineering, Penn State, University Park, Pennsylvania
| | - Scarlett R Miller
- Department of Industrial and Manufacturing Engineering, Penn State, University Park, Pennsylvania; School of Engineering Design, Technology, and Professional Programs, Penn State, University Park, Pennsylvania
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Zuo H, Feng W, Tang X, Li Z, Fan Y. The study of loading mode with in-vitro fatigue testing for mitral annuloplasty ring. J Biomech 2024; 166:112047. [PMID: 38484653 DOI: 10.1016/j.jbiomech.2024.112047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 02/23/2024] [Accepted: 03/07/2024] [Indexed: 04/13/2024]
Abstract
To maintain the physiological dynamics of the mitral annulus, mitral annuloplasty rings (MAR) must be flexible. Enhanced flexibility implies decreased resistance to fatigue and potential for fatigue fracture. This study established new methods to test the flexible fatigue life of MAR in-vitro using numerical analysis; the purpose is that the fatigue test could reflect the real stress distribution in-vivo. Based on the conventional test methods (C1, D1), this paper presents a novel test method (C2, D2). Four testing methods for open-end annuloplasty rings (C1, C2) and closed-end annuloplasty rings (D1, D2) were modelled and their stress distribution calculated by finite element analysis. The mean absolute error (Χ) and the Pearson correlation coefficient (Φ) were used to quantify the difference in stress distribution between the loading modes in-vivo and in-vitro. For closed-end annuloplasty rings, the novel test method (D2) is not obvious better than conventional test methods(D1) in duplicating the stress distribution (ΦD1 = 0.88 vs ΦD2 = 0.92). However, the maximum values of stress in the novel test method are closer to the maximum value of stress under in-vivo loading (ΧD1 = 5.2Mpa vs ΧD2 = 4.4Mpa). For open-end annuloplasty rings, the novel test method(C2) is obviously superior to the conventional test method(C1) in duplicating both the stress distribution and the stress peak values of the in-vivo loading (ΦC1 = 0.22 vs ΦC2 = 0.98; ΧC1 = 59.1Mpa vs ΧC2 = 11.0Mpa). The in-vitro loading methods described in this article more closely approximated in-vivo conditions compared to traditional methods. They are simpler to operate, more efficient and can help manufacturers expedite new product development, assist regulatory agencies with product quality oversight.
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Affiliation(s)
- Hui Zuo
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Wentao Feng
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China.
| | - Xiaolan Tang
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Zhou Li
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Yubo Fan
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China.
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Terstege DJ, Epp JR. PAW, a cost-effective and open-source alternative to commercial rodent running wheels. HARDWAREX 2024; 17:e00499. [PMID: 38204596 PMCID: PMC10776975 DOI: 10.1016/j.ohx.2023.e00499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 11/24/2023] [Accepted: 12/08/2023] [Indexed: 01/12/2024]
Abstract
Voluntary wheel running is a common measure of general activity in many rodent models across neuroscience and physiology. However, current commercial wheel monitoring systems can be cost-prohibitive to many investigators, with many of these systems requiring investments of thousands of dollars. In recent years, several open-source alternatives have been developed, and while these tools are much more cost effective than commercial system, they often lack the flexibility to be applied to a wide variety of projects. Here, we have developed PAW, a 3D Printable Arduino-based Wheel logger. PAW is wireless, fully self-contained, easy to assemble, and all components necessary for its production can be obtained for only $75 CAD. Furthermore, with its compact internal electronics, the 3D printed casing can be easily modified to be used with a wide variety of running wheel designs for a wide variety of rodent species. Data recorded with the PAW system shows circadian patterns of activity which is expected from mice and is consistent with results found in the literature. Altogether, PAW is a flexible, low-cost system that can be beneficial to a broad range of researchers who study rodent models.
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Affiliation(s)
- Dylan J. Terstege
- Department of Cell Biology and Anatomy, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, Alberta T2N 4N1, Canada
| | - Jonathan R. Epp
- Department of Cell Biology and Anatomy, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, Alberta T2N 4N1, Canada
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Pigmans RRWP, Klein-Blommert R, van Gestel MC, Markhorst DG, Hammond P, Boomsma P, Daams T, de Jong JMA, Heeman PM, van Woensel JBM, Dijkman CD, Bem RA. Development of personalized non-invasive ventilation masks for critically ill children: a bench study. Intensive Care Med Exp 2024; 12:21. [PMID: 38424411 PMCID: PMC10904697 DOI: 10.1186/s40635-024-00607-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 02/22/2024] [Indexed: 03/02/2024] Open
Abstract
BACKGROUND Obtaining a properly fitting non-invasive ventilation (NIV) mask to treat acute respiratory failure is a major challenge, especially in young children and patients with craniofacial abnormalities. Personalization of NIV masks holds promise to improve pediatric NIV efficiency. As current customization methods are relatively time consuming, this study aimed to test the air leak and surface pressure performance of personalized oronasal face masks using 3D printed soft materials. Personalized masks of three different biocompatible materials (silicone and photopolymer resin) were developed and tested on three head models of young children with abnormal facial features during preclinical bench simulation of pediatric NIV. Air leak percentages and facial surface pressures were measured and compared for each mask. RESULTS Personalized NIV masks could be successfully produced in under 12 h in a semi-automated 3D production process. During NIV simulation, overall air leak performance and applied surface pressures were acceptable, with leak percentages under 30% and average surface pressure values mostly remaining under normal capillary pressure. There was a small advantage of the masks produced with soft photopolymer resin material. CONCLUSION This first, proof-of-concept bench study simulating NIV in children with abnormal facial features, showed that it is possible to obtain biocompatible, personalized oronasal masks with acceptable air leak and facial surface pressure performance using a relatively short, and semi-automated production process. Further research into the clinical value and possibilities for application of personalized NIV masks in critically ill children is needed.
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Affiliation(s)
- Rosemijne R W P Pigmans
- Pediatric Intensive Care Unit, Emma Children's Hospital, Amsterdam UMC, Location AMC, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands.
- Amsterdam Reproduction and Development Research Institute, Amsterdam, The Netherlands.
| | - Rozalinde Klein-Blommert
- Pediatric Intensive Care Unit, Emma Children's Hospital, Amsterdam UMC, Location AMC, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands
| | - Monica C van Gestel
- Pediatric Intensive Care Unit, Emma Children's Hospital, Amsterdam UMC, Location AMC, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands
| | - Dick G Markhorst
- Pediatric Intensive Care Unit, Emma Children's Hospital, Amsterdam UMC, Location AMC, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands
| | - Peter Hammond
- Nuffield Department of Women's and Reproductive Health, University of Oxford, Oxford, UK
- Big Data Institute, Old Road Campus, University of Oxford, Oxford, UK
| | - Pim Boomsma
- Department for Medical Innovation and Development, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Tim Daams
- Department for Medical Innovation and Development, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Julia M A de Jong
- Department for Medical Innovation and Development, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Paul M Heeman
- Department for Medical Innovation and Development, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Job B M van Woensel
- Pediatric Intensive Care Unit, Emma Children's Hospital, Amsterdam UMC, Location AMC, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands
- Amsterdam Reproduction and Development Research Institute, Amsterdam, The Netherlands
| | - Coen D Dijkman
- Department for Medical Innovation and Development, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Reinout A Bem
- Pediatric Intensive Care Unit, Emma Children's Hospital, Amsterdam UMC, Location AMC, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands
- Amsterdam Reproduction and Development Research Institute, Amsterdam, The Netherlands
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50
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Naga HI, Emovon E, Kim JK, Hernandez JA, Yoo JS. T-line Hernia Mesh Repairs of Large Umbilical Hernias: Technique and Short-term Outcomes. PLASTIC AND RECONSTRUCTIVE SURGERY-GLOBAL OPEN 2024; 12:e5668. [PMID: 38510327 PMCID: PMC10954056 DOI: 10.1097/gox.0000000000005668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 01/22/2024] [Indexed: 03/22/2024]
Abstract
Background The T-line hernia mesh is a synthetic, polypropylene mesh specifically designed to prevent anchor point failure by evenly distributing tension through mesh suture extensions. This case series illustrates the first clinical application of the T-line mesh for umbilical hernia repair (UHR). Methods This study is a retrospective, consecutive cases series of all adult patients presenting to a single surgeon with symptomatic umbilical hernia requiring surgical repair using the T-line hernia mesh. Patient demographics, surgical details, and 30-day postoperative complications were collected. Descriptive statistics were computed in Microsoft Excel (Redmond, Va.). Results Three patients presented for UHR. All three patients were obese with mean body mass index of 37.5 ± 6.6. Two patients were former smokers, and two had presented after hernia recurrence. The average defect size was 80.1 cm2 ± 94.0 cm2. Two patients had UHR with onlay mesh placement, whereas one had a transversus abdominus release followed by retrorectus mesh placement. The average mesh size was 192.3 cm2 ± 82.5 cm2. All three cases were classified as clean. There were no intraoperative complications. No patients experienced 30-day postoperative complications or recurrence. Conclusions We present a case series of three patients presenting with large, symptomatic umbilical hernias who underwent UHR with T-line hernia mesh reinforcement without short term complications or hernia recurrence at last follow-up.
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Affiliation(s)
- Hani I Naga
- From the Department of Surgery, Duke University Hospital, Durham, N.C
| | - Emmanuel Emovon
- From the Department of Surgery, Duke University Hospital, Durham, N.C
| | - Joshua K Kim
- From the Department of Surgery, Duke University Hospital, Durham, N.C
| | | | - Jin S Yoo
- From the Department of Surgery, Duke University Hospital, Durham, N.C
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