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Posterior Palatal Expansion via Subnasal Endoscopy (2PENN) for Maxillary Deficiency: A Pilot Study. Laryngoscope 2024; 134:1970-1977. [PMID: 37772955 PMCID: PMC10947985 DOI: 10.1002/lary.31060] [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: 10/07/2022] [Revised: 05/01/2023] [Accepted: 06/28/2023] [Indexed: 09/30/2023]
Abstract
OBJECTIVE Surgically assisted rapid palatal expansion (SARPE) addresses transverse maxillary deficiency, a known contributor to nasal obstruction. The purpose of this study was to assess the feasibility, preliminary outcomes, and safety of posterior palatal expansion via subnasal endoscopy (2PENN), a modified SARPE procedure, aimed at achieving anterior and posterior maxillary expansion. METHODS This prospective case series included consecutive adult patients with findings of transverse maxillary deficiency that underwent the 2PENN procedure from 4/2021 to 4/2022. Patients completed pre- and post-operative clinical evaluations, Nasal Obstruction and Septoplasty Effectiveness (NOSE) questionnaires, and computed tomography (CT), with measures including expansion at the level of the posterior nasal spine (PNS), first maxillary inter-molar distance (IMD), and anterior nasal spine (ANS). RESULTS The cohort (N = 20) was middle-aged (39 ± 11 years), predominantly male (80%), and overweight (BMI 28 ± 4 kg/m2 ). The majority (85%) of patients had sleep breathing issues, of which 10 (59%) had polysomnography-confirmed obstructive sleep apnea (OSA). Full anterior-posterior separation of the mid-palatal suture line was evident on all post-operative CT scans, with mean expansion at the PNS of 3.6 ± 1.3 mm, IMD of 6.1 ± 1.6 mm and ANS of 7.0 ± 1.6 mm (p < 0.001). Following surgery, mean NOSE scores improved from 57 ± 23 to 14 ± 13 (p < 0.001). One patient required maxillary antrostomy for post-operative sinusitis. CONCLUSION 2PENN is an effective and safe technique for achieving both anterior and posterior maxillary expansion in patients with transverse maxillary deficiency. Further study is warranted to better understand the effect of 2PENN in patients with OSA, particularly as it relates to improving pharyngeal patency. LEVEL OF EVIDENCE 4 Laryngoscope, 134:1970-1977, 2024.
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A Novel Geospatial Assistive Navigation Technology for Seamless Multimodal Mobility of Wheelchair Users. Stud Health Technol Inform 2023; 306:409-415. [PMID: 37638943 DOI: 10.3233/shti230652] [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: 08/29/2023]
Abstract
Mobility is fundamental for social participation of people with disabilities. Unfortunately, traditional design of urban environments, including infrastructure and services are developed based largely on a standard perception of an independent, fully functional citizen without disability which limits the mobility social participation of PWD. This paper presents the design and development of a novel geospatial assistive navigation technology to support multimodal mobility of people with disabilities, especially those using manual wheelchair in urban areas.
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Intersectoral Development of an Evaluation Tool for the Socio-Professional Rehabilitation Process Adapted to People with Autism. Stud Health Technol Inform 2023; 306:311-317. [PMID: 37638930 DOI: 10.3233/shti230637] [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: 08/29/2023]
Abstract
Since there was no French tool adapted to the reality of people with autism enrolled in a work integration program in Quebec, we have modified the Profile of Rehabilitation and Adaptation in a Work Context for People with Intellectual Disabilities according to the scientific literature on autism. Content validity (n=17) and applicability (n=5) were done with success. Result is an Excel compiler containing 3 informative tabs, 10 tabs on the dimensions of work rehabilitation (59 items) and 4 tabs used to compile the results. Socio-professional practicians are welcomed to use this new tool to pursue construct and internal validity.
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The Influence of Teleworking in a Pandemic Context on the Work Experience of Individuals with Physical Disabilities: A Quebec Qualitative Study. JOURNAL OF OCCUPATIONAL REHABILITATION 2023; 33:375-388. [PMID: 36342631 PMCID: PMC9640780 DOI: 10.1007/s10926-022-10080-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Accepted: 10/17/2022] [Indexed: 05/12/2023]
Abstract
The COVID-19 pandemic has led to numerous changes in work environments. Thousands of workers quickly found themselves having to telework without being prepared, which had consequences on their work experience and health. Authors proposed telework practices that promote the healthy work experience of workers in a pandemic context, but less attention has been paid to consider the realities and needs of individuals with physical disabilities. Purpose This study aimed to explore the influence of telework during the pandemic on the work experience of people with physical disabilities. Methods Following an interpretive descriptive research design, interviews were conducted with 16 workers with physical disabilities (i.e., motor, or sensory). The data were analyzed using a thematic analysis strategy. Results The results revealed 15 factors that influence the work experience of teleworkers with physical disabilities. These factors are related to interactions between three spheres of the worker's life: the individual, the organization, and the environment. Ten recommendations are proposed to consider the reality and needs of individuals with physical disabilities in the telework practices. Conclusion Given that telework has expanded since the onset of the COVID-19 pandemic and will likely continue to remain a widespread modality of work delivery, it becomes even more important to expand knowledge about it, to benefit the work experience of teleworkers with physical disabilities.
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Teleworking to Support Accommodation, Inclusion, and Health of Aging Workers: Protocol for a Study to Design, Validate, and Test a Reflective Application Guide. JMIR Res Protoc 2023; 12:e46114. [PMID: 37227762 DOI: 10.2196/46114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 04/25/2023] [Accepted: 04/30/2023] [Indexed: 05/26/2023] Open
Abstract
BACKGROUND Aging workers constitute a growing population in many countries and form an indispensable and qualified resource, especially in the context of the labor shortage. Despite work's many benefits for individuals, organizations, and societies, it also presents several risks and challenges that may lead to occupational injuries. Thus, rehabilitation professionals and managers working with this emerging and unique clientele during their return to work after an absence often lack the tools and skills to support them, especially in the changing world of work that includes the rise of telework. Indeed, as an increasingly present work arrangement, telework has the potential to be used as an accommodation modality that can facilitate inclusion and healthy participation in the workplace. However, the implications of this topic for aging workers require study. OBJECTIVE This paper presents the protocol of a study that aims to develop a reflective telework application guide to support the accommodation, inclusion, and health of aging workers after an absence from work. Specifically, this study will (1) explore the experience of aging workers, managers, and rehabilitation professionals regarding telework and its impact on accommodation, inclusion, and health; (2) use a validated logic model to design a reflective application guide; and (3) test and evaluate the guide. METHODS Following a 3-phase developmental research design, individual interviews with aging teleworkers, managers, and rehabilitation professionals will enable the collection of qualitative data to be used in generating a logic model of levers and good practices, leading to the creation of a reflective application guide. Validation of this guide by workers and managers to measure its acceptability and applicability in daily life will precede its implementation. RESULTS Data collection began in spring 2023 and initial results are expected in fall 2023. This study aims to generate a concrete tool-namely, the reflective telework application guide-that rehabilitation professionals could use to support managers and aging workers during their return to work through the healthy use of telework. All phases of the study include conducting dissemination activities to share the results of the project and increase its sustainability potential (ie, publication through social networks, podcasts, conferences, and scientific publications). CONCLUSIONS As the first of its kind, this project aims to produce innovative impacts at several levels, including practical, scientific, and societal impacts. In addition, the results will provide healthy solutions to the labor shortage in a changing world of work, where digital and teleworking are becoming increasingly important. INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID) DERR1-10.2196/46114.
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Impacts and Identification of Hearing Aid Refurbishing Programs for People with Hearing Loss: A Scoping Review. Audiol Res 2023; 13:326-340. [PMID: 37218839 DOI: 10.3390/audiolres13030028] [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: 03/09/2023] [Revised: 05/02/2023] [Accepted: 05/04/2023] [Indexed: 05/24/2023] Open
Abstract
This article consists of a scoping review completed to describe the impacts of refurbished hearing aids (HAs) for people with hearing loss, and to identify existing HA refurbishing programs around the world. In this review, JBI methodological guidance for scoping reviews was followed. All types of sources of evidence were considered. Thirty-six sources of evidence were included, 11 articles and 25 web pages. Results suggest that refurbished HAs may improve communication and social participation for individuals with hearing loss and provide monetary savings to them and to governmental agencies. Twenty-five HA refurbishing programs were identified, all based in developed countries and distributing refurbished HAs mostly locally, but also in developing countries. Issues related to refurbished HAs were highlighted, such as potential cross-contamination, quick obsolescence, and repairing problems. Some facilitators for the success of this intervention are to offer accessible and affordable follow-up services, repairs, and batteries, and to ensure awareness and participation of hearing healthcare professionals and citizens with hearing loss. In conclusion, the use of refurbished HAs appears to be a valuable option for low-income people with hearing loss, but it should be included in a more global intervention program to ensure its sustainability.
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Anaesthesia for vascular emergencies - a state of the art review. Anaesthesia 2023; 78:236-246. [PMID: 36308289 DOI: 10.1111/anae.15899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/12/2022] [Indexed: 01/11/2023]
Abstract
In this state-of-the-art review, we discuss the presenting symptoms and management strategies for vascular emergencies. Although vascular emergencies are best treated at a vascular surgical centre, patients may present to any emergency department and may require both immediate management and safe transport to a vascular centre. We describe the surgical and anaesthetic considerations for management of aortic dissection, aortic rupture, carotid endarterectomy, acute limb ischaemia and mesenteric ischaemia. Important issues to consider in aortic dissection are extent of the dissection and surgical need for bypasses in addition to endovascular repair. From an anaesthetist's perspective, aortic dissection requires infrastructure for massive transfusion, smooth management should an endovascular procedure require conversion to an open procedure, haemodynamic manipulation during stent deployment and prevention of spinal cord ischaemia. Principles in management of aortic rupture, whether open or endovascular treatment is chosen, include immediate transfer to a vascular care centre; minimising haemodynamic changes to reduce aortic shear stress; permissive hypotension in the pre-operative period; and initiation of massive transfusion protocol. Carotid endarterectomy for carotid stenosis is managed with general or regional techniques, and anaesthetists must be prepared to manage haemodynamic, neurological and airway issues peri-operatively. Acute limb ischaemia is a result of embolism, thrombosis, dissection or trauma, and may be treated with open repair or embolectomy, under either general or local anaesthesia. Due to hypercoagulability, there may be higher numbers of acutely ischaemic limbs among patients with COVID-19, which is important to consider in the current pandemic. Mesenteric ischaemia is a rare vascular emergency, but it is challenging to diagnose and associated with high morbidity and mortality. Several peri-operative issues are common to all vascular emergencies: acute renal injury; management of transfusion; need for heparinisation and reversal; and challenging postoperative care. Finally, the important development of endovascular techniques for repair in many vascular emergencies has improved care, and the availability of transoesophageal echocardiography has improved monitoring as well as aids in surgical placement of endovascular grafts and for post-procedural evaluation.
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Influence of gender on people with disabilities' work relationships: prospects for ergonomics interventions. ERGONOMICS 2022; 65:1554-1566. [PMID: 35188087 DOI: 10.1080/00140139.2022.2045363] [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: 09/24/2021] [Accepted: 02/18/2022] [Indexed: 06/14/2023]
Abstract
Norms and values embedded in what is referred to as 'institutionalised gender,' defined by the distribution of power between genders in the political, educational, religious, medical, cultural or social institutions of a society, exist even today. The above mentioned influential institutions shape societal norms that define, reproduce and justify differing expectations and opportunities for women, men, girls and boys. Using qualitative methods, 41 semi-structured interviews among employed people with deafness/hard of hearing (DHH), blindness/low vision, motor disabilities, or chronic pain from three administrative regions of Québec (Montréal, Outaouais, and Montérégie) were analysed. The results show that while gender is omnipresent in participants' remarks, it is not necessarily associated with exclusion from employment, but most certainly with perpetuating some forms of inequity in work situations. Solutions to raise awareness among ergonomists working with people with disabilities are suggested.Practitioner summary: Based on 41 semi-structured interviews among employed people with disabilities, a relationship between the gender of the participants and factors facilitating or inhibiting their integration into employment were established. Solutions to raise awareness among ergonomists working with a doubly marginalised population-women with disabilities-are suggested.Abbreviations: DEPPI: disability, employment, and public policies initiative; DHH: deaf or hard of hearing; LSQ: québec sign language; M: men; P: participant; s/g: sex and gender; W: women.
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Transverse Growth of the Maxillo-Mandibular Complex in Untreated Children: A Longitudinal Cone Beam Computed Tomography Study. SENSORS 2021; 21:s21196378. [PMID: 34640696 PMCID: PMC8512966 DOI: 10.3390/s21196378] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 09/19/2021] [Accepted: 09/20/2021] [Indexed: 12/18/2022]
Abstract
The aim of this study is to evaluate the longitudinal transverse growth of the maxillo-mandibular complex in untreated children using the Cone Beam Computed Tomography (CBCT). Two sets of scans on 12 males (mean 8.75 years at T1 and 11.52 years at T2) and 18 females (mean 9.09 years at T1 and 10.80 years at T2) were analyzed using Dolphin 3D imaging. The transverse widths of various maxillary and mandibular skeletal landmarks and the dentoalveolar and dental landmarks at the level of first molars were measured. Overall, there were greater increases in the transverse dimension in the posterior than anterior portions of the maxilla and mandible. The increase in intergonial width of the mandible seems to be primarily due to the lengthening of the mandibular body. The dentoalveolar process at the first molar level increases at an equal rate corono-apically and is independent to the changes in molar inclination. When comparing maxillary dentoalveolar changes with that of the mandible, greater increases were noticed in the maxilla, which might be explained by the presence of sutural growth in the maxilla. Moreover, the first molars maintain their coordination with each other despite the differential increase in the maxillary and mandibular dentoalveolar processes.
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A two-stage approach for phenotype modification with connective tissue and bone grafts in periodontally compromised class II, division 2 patients. JOURNAL OF CLINICAL ORTHODONTICS : JCO 2021; 55:543-557. [PMID: 35015716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
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Impact of COVID-19 on people with physical disabilities: A rapid review. Disabil Health J 2021; 14:101014. [PMID: 33158795 PMCID: PMC7603994 DOI: 10.1016/j.dhjo.2020.101014] [Citation(s) in RCA: 102] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 10/10/2020] [Accepted: 10/24/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND The COVID-19 pandemic caused drastic changes in the lives of the general population. People with physical disabilities, who commonly encounter daily challenges such as barriers to community mobility, reduced access to healthcare services and higher risk of suffering from depression, may face additional challenges in the context of the pandemic. OBJECTIVE This study aims to review the impact of the COVID-19 pandemic, and associated isolation and protective measures, among people with physical disabilities. METHODS A rapid review of the published literature was conducted on August 10, 2020 through a search in six online databases to synthesize results from original studies regarding the impact of the COVID-19 pandemic on people with physical disabilities. The International Classification of Functioning, Disability and Health was used to describe the population and the personal and environmental factors with a unified and standard health language. RESULTS Eleven records were extracted from 1621 individual papers retrieved from the search strategy. Various impacts on daily functioning such as a decrease in access to healthcare have been noted during the pandemic. Changes in social and lifestyle habits, mood changes and decreased levels of physical activity were also noted. CONCLUSIONS Our results highlighted the lack of early research about the impacts of COVID-19 experienced by people with physical disabilities. Future studies should focus on specific consequences and needs of this vulnerable population to ensure their inclusion in public health recommendations and consideration by policy makers.
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Dietetic Professionals Role in Nutrition Care of a Simulated Pediatric Patient with Autism Spectrum Disorder. J Acad Nutr Diet 2020. [DOI: 10.1016/j.jand.2020.06.187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Disability Policy and Active Citizenship: The Case of Australia’s National Disability Insurance Scheme. JOURNAL OF DISABILITY POLICY STUDIES 2020. [DOI: 10.1177/1044207320932277] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In this article, we illustrate how Australia’s new National Disability Insurance Scheme (NDIS) extends the active citizenship of people with disabilities. This is done by examining how the NDIS changes their relation between persons with disabilities and to the welfare state, and through an analysis of its eligibility criteria and needs assessment planning. The support provided and the way in which it is provided reproduce a particular understanding of disability that has a direct influence on the roles assigned to people with disabilities in society as well as on their opportunities to exercise their rights as active citizens. This is important because the implementation of NDIS in Australia is likely to influence the development of disability policy on a global level. Understanding how its mechanisms restricts or facilitates citizenship is therefore crucial.
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A cone-beam computed tomographic evaluation of alveolar bone dimensional changes and the periodontal limits of mandibular incisor advancement in skeletal Class II patients. Angle Orthod 2020; 90:330-338. [PMID: 33378440 PMCID: PMC8032294 DOI: 10.2319/080219-510.1] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 12/01/2019] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVES To evaluate the presence of dehiscences and changes in alveolar bone height and width in the area of the mandibular central incisors pre- and post-orthodontic treatment. MATERIALS AND METHODS In 60 skeletal Class II patients, cone-beam computed tomographic (CBCT) images were obtained and the patients were divided into four groups based on the presence of dehiscences at pre- and post-orthodontic treatment. The alveolar bone height and width were measured on CBCT in cross section along the long axis of the teeth. Lateral cephalograms were analyzed. RESULTS The changes in L1-NB and IMPA appeared to be correlated with vertical bone loss and dehiscence. Alveolar bone height appeared to follow a segmented relationship with these two variables, with changes below a threshold (L1-NB = 0.71 mm, IMPA = 3.02°) having relatively minimal or no effect on bone loss but with changes beyond the threshold correlated with extensive bone loss. Similarly, increases in L1-NB or IMPA correlated with decreases in alveolar bone width (L1-NB: -0.25 mm/mm, IMPA: -0.07 mm/°) and increased the probability of developing dehiscences, with an estimated 50% probability of vertical bone loss at a L1-NB change of 2.00 mm or, equivalently, an IMPA change of 8.02° was estimated. CONCLUSIONS When treating skeletal Class II patients, the limits of incisor proclination/protraction are less than previously thought. To prevent undesired periodontal outcomes, careful three-dimensional diagnosis is advisable. Furthermore, when excessive protrusion and/or proclination is planned, additional treatment modalities, including orthognathic surgery, tooth extraction, and corticotomy with bone graft, should be considered.
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Prédiction de l’observance à court terme d’une diète méditerranéenne grâce à une approche métabolomique non ciblée et des études d’alimentation contrôlées. NUTR CLIN METAB 2020. [DOI: 10.1016/j.nupar.2020.02.431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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VA STAFF VIEWS ON THE ROLE OF RELIGIOUS/SPIRITUAL SUPPORT FOR OLDER VETERANS WITH ADVANCED ILLNESS. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.1961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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BARRIERS TO CARE IN ADVANCED ILLNESS: VIEWS FROM MULTIPLE STAKEHOLDERS. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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ACCEPTABILITY OF AN INNOVATIVE PALLIATIVE CARE MODEL: HEALTHCARE CONSUMER AND FEDERAL TAXPAYER VIEWS. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mapping review of accessible pedestrian infrastructures for individuals with physical disabilities. Disabil Rehabil Assist Technol 2018. [PMID: 29537329 DOI: 10.1080/17483107.2018.1449018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
BACKGROUND Due to the ageing population and higher prevalence of individuals living with physical disabilities, there is a critical need for inclusive practices when designing accessible pedestrian infrastructures for ensuring social participation and equal opportunities. PURPOSE Summarize the physical characteristics of current pedestrian infrastructure design for individuals with physical disabilities (IPD - motor, visual and hearing) found in the scientific literature and assess its quality. MATERIALS AND METHODS A mapping review of the existing literature on pedestrian infrastructures specifically built for individuals with physical disabilities identifying measurable physical characteristics for their design was done using online databases (Urban Studies Abstracts, Geobase, PubMed, and Cairn and secondary research). Information about accessibility (physical characteristics) of existing pedestrian infrastructures was extracted. The quality of the evidence was assessed using the Guidelines for critical review form - Quantitative studies and Qualitative studies version 2.0 (SAGE Publications, Inc., Thousand Oaks, CA). RESULTS Of the 1131 articles identified, forty-one articles examined access to bus stops, curb ramps, lighting, pedestrian crossings, ramps, shared spaces, sidewalks and steps. Six articles reported on more than one physical disability. Quality scores were generally low (quantitative: 2-11/15 and qualitative: 1-22/23). Recommended design features differed for the same infrastructure. CONCLUSIONS While there were a fair number of articles (n = 41) documenting accessible design features of pedestrian infrastructures, the quality of the evidence was low. The review identified knowledge gaps. Although specific design solutions exist, they have not yet been tested among individuals with various or multiple types of physical disabilities to ensure access to pedestrian infrastructures by all. Implications for Rehabilitation Pedestrian infrastructures still pose problems to mobility, limiting social participation and quality of life outcomes for individuals with physical disabilities (motor, visual and hearing). The results of this mapping review show that few articles are concerned with the accessibility of pedestrian infrastructures for more than one type physical disability, which might lead to recommendations that are inadequate for individuals with differing disabilities, few recommendations have been compared, most studies have been performed in environments not representative of northern countries and their quality score was generally low. Health professionals and State Parties have a complementary expertise that should be put to use in the determination and implementation of best design solutions to ensure the respect of the needs of individuals with physical disabilities. This review can thus help them have an idea of what has already been done to identify what needs to be achieved to fill the gap of knowledge required to insure access for individuals with motor, visual as well as hearing disabilities. Rehabilitation profesionals should take part in the assessment of the proposed solutions as well as the development of new designs to fill knowledge gaps.
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The contribution of social cognition in predicting social participation following moderate and severe TBI in youth. Neuropsychol Rehabil 2017; 29:1383-1398. [DOI: 10.1080/09602011.2017.1413987] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Use of CT Scout Film for Ureteric CalculiBrown. Int J Surg 2017. [DOI: 10.1016/j.ijsu.2017.08.481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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INTERPROFESSIONAL PALLIATIVE CARE WORKFORCE: A SURVEY OF TOMORROW’S HEALTHCARE TEAMS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.2155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Hépatite E, une cause rare de vascularite cutanée : à propos de 2 cas. Ann Dermatol Venereol 2016. [DOI: 10.1016/j.annder.2016.09.498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abstract
Dans le contexte actuel, il est important d’utiliser des méthodologies facilitant la consultation des citoyens concernés par une problématique quelconque. À cet effet, il est proposé d’explorer la méthode du forum communautaire. Celle-ci a été utilisée lors d’une étude québécoise portant sur les stratégies de soutien destinées aux familles ayant un enfant handicapé d’âge mineur. Le forum communautaire sera décrit et différents aspects de son organisation seront expliqués. Les avantages et les limites de cette consultation citoyenne seront également discutés. Le forum communautaire s’avère un outil intéressant pour l’intervenant social, car il remplit une triple fonction. Il permet de recueillir des informations de qualité, de sensibiliser les gens à un problème social ou de santé et de réaliser un processus de réflexion autour d’une question précise. La participation de la communauté étant incontournable dans la recherche de solutions à des préoccupations sociétales, le forum communautaire s’avère un outil de choix.
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Effects of rapid palatal expansion on the sagittal and vertical dimensions of the maxilla: a study on cephalograms derived from cone-beam computed tomography. Am J Orthod Dentofacial Orthop 2013; 144:398-403. [PMID: 23992812 DOI: 10.1016/j.ajodo.2013.04.012] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2012] [Revised: 04/01/2013] [Accepted: 04/01/2013] [Indexed: 11/17/2022]
Abstract
INTRODUCTION The purpose of this study was to use cone-beam computed tomography imaging to examine the skeletal and dental changes in the sagittal and vertical dimensions after rapid palatal expansion. METHODS Twenty-eight healthy children (mean age, 9.9 years; range, 7.8-12.8 years; 17 boys, 11 girls) who required rapid palatal expansion treatment were included. For each patient, a bonded Haas-type expander with full occlusal and palatal acrylic coverage was cemented in place. Cone-beam computed tomography images were obtained as part of the pretreatment orthodontic records and at the completion of rapid palatal expansion for all patients. The mean interval between pretreatment and completion of rapid palatal expansion was 52 days (range, 19-96 days). The average skeletal age of the patients, determined from hand-wrist films also obtained before treatment, was 10.1 years. The mean expansion of the expander was 8.0 mm (range, 5.9-9.6 mm). Each cone-beam computed tomography image was compressed from the outer portion of the right side of the patient's head to the center of the left central incisor into a 2-dimensional synthesized cephalogram, which was then traced and measured. RESULTS The results showed that from pretreatment to completion of rapid palatal expansion, SNA, FH-NA, and A-Nperp increased by means of 1.04°, 0.92°, and 0.87 mm, respectively (P <0.05). In addition, 1/-NA, 1/-SN, 1/-NA, 1/-Nperp, and 1/-PP showed mean decreases of 3.74°, 2.53°, 1.17 mm, 0.49 mm, and 2.69°, respectively (P <0.05). Both ANS and PNS moved significantly downward (ANS, 2.05 mm; PNS, 1.16 mm). CONCLUSIONS There was forward movement of the maxilla as a result of rapid palatal expansion treatment. Bonded rapid palatal expansion treatment resulted in downward displacement of the maxilla with a greater displacement of ANS than PNS and posterior movement of the maxillary central incisors.
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Abstract
BACKGROUND Little is known about variations in social participation among individuals with traumatic brain injury (TBI) living in different environments. OBJECTIVE To examine the social participation of individuals with moderate-to-severe TBI across various living arrangements. METHODS One hundred and thirty-six individuals with moderate-to-severe TBI, living either in natural settings (e.g. home), intermediate settings (e.g. group homes or foster families) or structured settings (e.g. nursing home or long-term care facilities) and requiring daily assistance, were interviewed using the LIFE-H tool, which measures the level of difficulty and the assistance required to carry out life habits and resulting social participation. Participation in six categories of life habits pertaining to Activities of Daily Living and five categories pertaining to Social Roles were examined. RESULTS The level of difficulty and the assistance required to carry out the life habits and the overall level of social participation were associated with living arrangements. Participation scores in Activities of Daily Living varied across living arrangements while Social Roles scores did not. CONCLUSION Living arrangements (such as intermediate settings) may better support social participation in individuals with TBI. There is a need to further study the issue of living arrangements as they seem to facilitate the performance of life habits, which impacts the social participation of individuals with TBI.
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Community needs of people living with spinal cord injury and their family. Top Spinal Cord Inj Rehabil 2013; 18:122-5. [PMID: 23459510 DOI: 10.1310/sci1802-122] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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[Extra-adrenal myelolipoma: a case report]. ACTA ACUST UNITED AC 2011; 92:50-3. [PMID: 21352727 DOI: 10.1016/j.jradio.2010.05.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2009] [Revised: 04/27/2010] [Accepted: 05/06/2010] [Indexed: 11/28/2022]
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How to increase the hydrophobicity of PTFE surfaces using an r.f. atmospheric-pressure plasma torch. SURF INTERFACE ANAL 2010. [DOI: 10.1002/sia.3384] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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The influence of selected personal and environmental factors on leisure activities in adults with cerebral palsy. Disabil Rehabil 2010; 32:1328-38. [DOI: 10.3109/09638280903514713] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Factors Related to Six-minute Walk Test Results in Adults with Cerebral Palsy. Med Sci Sports Exerc 2008. [DOI: 10.1249/01.mss.0000321581.82199.28] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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O-12 The use of control samples in the PAPANICOLAOU technical external quality assessment scheme. Cytopathology 2007. [DOI: 10.1111/j.1365-2303.2007.00500_12.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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A phase Ib study of oxaliplatin in combination with fluorouracil (5FU) and leucovorin (LV) in pediatric patients (pts) with advanced solid tumors. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.9548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
9548 Background: Platinums have significant activity in a wide variety of pediatric tumors, and oxaliplatin exhibits synergy with 5FU and LV in adults with colorectal cancer in FOLFOX regimens. The primary objectives of this study are to determine the maximum tolerated dose (MTD) of the modified FOLFOX6 regimen in pediatric tumors. Secondary objectives include safety, PK pharmacokinetic (PK) and PET scan efficacy analyses. Methods: Pts age <21 years with advanced cancers and adequate organ function are eligible. Patients are stratified by tumor type (CNS or non-CNS) to better delineate the potential neurotoxicity in patients with altered neurologic function. Pts received oxaliplatin starting at 85 mg/m2 and LV 400 mg/m2 over 2 hours on day 1 followed by a 5FU bolus of 400 mg/m2 then 2,400 mg/m2 continuous infusion over 46 hours, every 2 weeks (3 courses = 1 cycle), with integrated PK sampling in a limited dose escalation design. Standard 3+3 dose escalation, definitions of dose limiting toxicity (DLT), and dose modification for toxicity are implemented. The MTD is expanded to 15 patients to confirm and further characterize tolerability and toxicity. Results: To date, 15 very heavily pre-treated patients (7 M, 8 F) have received 25 cycles (range 1–4, median 2) of treatment at 2 dose levels. One of 8 pts at dose level 2 (oxaliplatin 100 mg/m2) developed DLT (delay in repeat treatment > 14 days due to grade 3 platelets). Treatment has been well tolerated. The most frequently reported related grade 3–4 adverse events (AEs) are reversible leukocytes (29%), neutropenia (43%), platelets (35%) and lymphopenia (21%). 31 of 90 courses (34%) have been delayed for neutropenia and thrombocytopenia. Anti-tumor activity to date includes a confirmed partial response lasting 15 weeks in a patient with osteosarcoma, and prolonged stable disease in 5 other pts with brain tumors (2), hepatoblastoma (2) and sarcoma (1). Conclusions: The modified FOLFOX6 regimen has significant but reversible myelosuppression in heavily pre-treated pediatric patients, but is tolerable and has promising activity in several tumor types. Cohort expansion continues at 100 mg/m2 of oxaliplatin. PET scan and pharmacokinetic analyses will be presented. No significant financial relationships to disclose.
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Phase I pharmacokinetic (PK) and pharmacodynamic (PD) study of 17-Allylamino-17-demethoxygeldanamycin (17AAG) in children with solid tumors. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.9022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
9022 Background: 17AAG is a benzoquinone ansamycin that binds to heat shock protein 90 (Hsp90) and alters levels of cancer-associated proteins that are regulated by Hsp90. 17AAG has been well-tolerated in adults, but has not previously been administered to children. Methods: A Phase I study of 17AAG was initiated to define the maximally tolerated dose and toxicity profile of this drug in children. PK and PD were also studied. Cohorts of 3–6 patients with recurrent or refractory solid tumors were treated every 21 days with escalating doses of 17AAG twice weekly for two weeks. Plasma PK of 17AAG and its major metabolite, 17AG, were measured on day 1 by HPLC. Changes in levels of the inducible isoform of Hsp70 were assessed by Western blot using peripheral blood mononuclear cells (PBMCs) obtained 24 h after the 17AAG infusion. Actin was measured for comparison. Because 17AAG is a substrate for CYP3A4/5 and MDR1, pharmacogenetic analyses have been undertaken to determine if genotypes including CYP3A4*1B, CYP3A5*3, and MDR1 G2677T/A and C3435T influence 17AAG disposition. Results: 12 pts (median age 11 years, range 5–18) with neuroblastoma (5), osteosarcoma (4), Ewing’s family tumors (2), and desmoplastic small round cell tumor (1) have been treated with 17AAG. An MTD has yet to be defined though one dose limiting toxicity (Grade 3 hypoxia) was observed at Dose Level 4 (360 mg/m2). The AUC of 17AAG increased with dose, with a linear relationship between end of infusion 17AAG plasma concentration and AUC. The AUC of 17AAG increased with dose, with a linear relationship between end of infusion 17AAG plasma concentration and AUC. Clearance ranged between 12.5 and 29.6 l/hr/m2 (median, 21.6 l/h/m2) and did not change with increasing doses. Post-treatment increases in Hsp70 in PBMCs have been observed in pts treated with 17AAG doses at or above 150 mg/m2. Declines in Akt and IGF1R in PBMCs have been seen in some but not all pts following treatment. Conclusions: 17AAG is well tolerated in children at dose levels studied to date. 17AAG dose escalation continues and at the time of the meeting, updated data will be reported. No significant financial relationships to disclose.
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A +2138InsCAGACC polymorphism of the melanocortin receptor 3 gene is associated in human with fat level and partitioning in interaction with body corpulence. Mol Med 2002; 8:158-65. [PMID: 12142547 PMCID: PMC2039979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023] Open
Abstract
BACKGROUND The melanocortin system includes five receptors (MC1R to MC5R), and mouse and human MC4R has been shown to be involved in the regulation of feeding, and mouse MC3R in body composition. To verify a possible similar effect of MC3R in humans, we analyzed one insertion and one single nucleotide polymorphism by restriction fragment length polymorphisms (RFLP), and a microsatellite (D20S32e) in relation to body composition and glucose metabolism. METHODS Eight hundred twelve subjects of the Québec Family Study (QFS) cohort were analyzed for body composition, food intake, and energy metabolism phenotypes. Southern Blot with the complete MC3R cDNA was used to detect a new +2138InsCAGACC variant by Pst1 restriction. PCR-RFLP with BsaJ1 was used to type amino acid polymorphism V81I arising from a G241A nucleotide change. PCR and automatic DNA sequencers were used for the analysis of the TG dinucleotide repeat D20S32e located between -1933/-1892 of MC3R. In a covariance analysis among genotypes, phenotypes were adjusted for age and sex as covariates. Food intake and energy metabolism phenotypes were also adjusted for body mass index (BMI), and leptin and abdominal fat, as assessed by a computed tomography scan, for fatness using six skinfold thicknesses. RESULTS An association between the +2138InsCAGACC MC3R polymorphism was observed with fat mass (FM), percent body fat (%FAT), and total abdominal fat (ATF). Homozygote subjects for the +2138 insertion variant allele in normal weight (BMI < 25 kg/m(2)) and overweight (25 < or = BMI < 30 kg/m(2)) subjects showed a similar level of fatness despite the overall difference in BMI. In normal weight, homozygotes for the insertion allele showed higher mean values than heterozygotes and homozygotes for wild-type allele without insertion (%FAT: 24.0 +/- 1.1 versus 19.3 +/- 0.9 and 20.5 +/- 0.8, p = 0.0005; FM: 15.7 +/- 0.9 kg versus 11.7 +/- 0.7 kg and 12.6 +/- 0.6 kg, p = 0.0003). In contrast, overweight subjects homozygote for the variant allele showed lower mean values (%FAT: 27.0 +/- 1.2 versus 31.4 +/- 0.8 and 30.9 +/- 0.7, p = 0.002; FM: 18.3 +/- 1.0 kg versus 22.8 +/- 0.8 kg and 22.0 +/- 0.6 kg, p = 0.0001). This resulted in a similar level of body fat between both BMI groups for subjects homozygote for the insertion allele versus wild-type allele carriers (%FAT: +/-2-3% versus +/-10-12%; FM: +/-2 kg versus +/-9-11 kg). In obese subjects (BMI > or = 30 kg/m(2) ), a lower level of ATF was seen (-15%, p = 0.002). Other polymorphisms and phenotypes tested showed no association. CONCLUSION A new 12138InsCAGACC MC3R polymorphism is associated with the level of adiposity and with body fat partitioning in interaction with corpulence in humans.
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Electrophysiological and behavioral output of the rat basal ganglia after intrastriatal infusion of d-amphetamine: lack of support for the basal ganglia model. Brain Res 2001; 920:170-82. [PMID: 11716823 DOI: 10.1016/s0006-8993(01)03059-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dopamine, by acting upon D1 and D2 dopamine receptors located on striatonigral and striatopallidal neurons, respectively, has been postulated to inhibit output from the substantia nigra pars reticulata (SNpr) and internal pallidal segment (GPi). The inhibition of the SNpr/GPi should, in turn, disinhibit the thalamus to facilitate movement. The present study tests this prediction in intact (unlesioned) rats by attempting to correlate changes in the single unit activities of SNpr neurons with motor (i.e. behavioral) responses in the 20-30 min after infusions of d-amphetamine into the striatum. Unilateral injections of amphetamine (20 microg/microl) into either the dorsal-rostral, central, or ventral-lateral striatum failed to appreciably alter behavior and, in parallel electrophysiological studies, failed to consistently or significantly alter the activities of SNpr neurons in either chloral hydrate-anesthetized rats or awake locally anesthetized rats. However, when amphetamine was infused bilaterally into the ventral-lateral striatum (VLS; 20 microg/microl per side), a robust behavioral activation ensued (increased locomotor activity, oral movements, and sniffing) with an onset ranging from immediate to 20 min post-infusion and persisting for at least 40 min. In parallel studies, bilateral amphetamine infusions into VLS also caused changes in the firing frequency of a majority of SNpr neurons. However, the changes in firing were extremely variable and, contrary to expectation, the net population response of SNpr neurons was an increase in firing which corresponded in time with the period of peak behavioral activation. These results show that (i) bilateral but not unilateral activation of striatal dopamine receptors is needed to elicit behavioral and electrophysiological output from the basal ganglia, and (ii) motor activation is apparently not signaled by a generalized inhibition of SNpr firing, as is predicted by the basal ganglia model.
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Intratester and intertester reliability of the Cybex electronic digital inclinometer (EDI-320) for measurement of active neck flexion and extension in healthy subjects. MANUAL THERAPY 2001; 6:235-41. [PMID: 11673934 DOI: 10.1054/math.2001.0419] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This study examined the intratester and intertester reliability of the electronic digital goniometer EDI-320 for the measurement of active neck flexion and extension in healthy subjects. In the context of evidence-based practice, the EDI-320 instrument has the potential to improve patient assessment, provide a clearer picture of patient progress, and confirm the effectiveness of physiotherapy interventions. However, the psychometric properties of the EDI-320 have not yet been documented for cervical spine range of motion. Forty-four individuals with no known history of cervical disorder within the three months prior to the testing, voluntarily consented to participate in this study. Repeated measurements with the EDI-320 were taken by two trained testers (TH1 and TH2) and data were recorded by two separate observers. Subjects performed a standardized warm-up. Testers were required to repeat palpation of bony landmarks prior to each trial. Measurements were taken at the end-range of active cervical flexion and extension for each subject. Both testers measured each subject twice. The intraclass correlation coefficients (ICC) were derived from one-way ANOVA for intratester reliability and a two-way ANOVA for intertester reliability. Paired t -tests were then applied to verify for systematic error. Moderate intratester reliability was found for both testers for flexion (TH1: ICC=0.77; 95% CI: 0.62-0.87; TH2: ICC=0.77; 95% CI: 0.58-0.87). As for extension, high intratester reliability was found for TH1 (ICC=0.79; 95% CI: 0.65-0.88) and moderate for TH2: (ICC=0.83; 95% CI: 0.63-0.92). Intertester reliability results showed a moderate reliability for both flexion and extension (ICC=0.66; 95% CI: 0.24-0.84) on the first trial. On the second trial, reliability was moderate for flexion (ICC=0.73; 95% CI: 0.53-0.85) and high for extension (ICC=0.80; 95% CI: 0.64-0.89). The t -test analysis revealed the inclusion of systematic error by Tester 2 for intratester reliability. This error was also found for all but one of the intertester reliability calculations. This study has shown that the EDI-320 is a moderately reliable instrument for quantifying cervical flexion and extension range of motion. The presence of systematic error in the study highlights the importance of following standardized procedures and suggests that the EDI-320 could be more reliable than reported in this study. Further psychometric studies investigating the validity of the EDI and reliability with subjects affected by cervical pathology is warranted.
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Development of a very sensitive luminescence assay for the measurement of paclitaxel and related taxanes. Anticancer Res 1999; 19:5127-30. [PMID: 10697521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
A rapid and very sensitive enzyme immunoassay was developed for the measurement of paclitaxel and related taxanes in crude extracts of Taxus sp., in human serum and in culture medium of paclitaxel-producing microorganisms such as Erwinia taxi. For the ELISA, paclitaxel was chemically modified by the introduction of an amine to enable coupling with biotin. The presence of paclitaxel or related taxanes competitively inhibited the binding of paclitaxel-biotin to anti-taxane monoclonal antibody. This method detected paclitaxel in concentrations as low as 33 pM; the affinity of the antibody was higher for paclitaxel than for cephalomanine, baccatin and DAB. The sensitivity of this assay makes it useful for estimating the paclitaxel and taxanes content of Taxus sp. extracts, monitoring the paclitaxel serum level of paclitaxel treated patients and in other biological fluids.
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Abstract
Expression of Galalpha(1-3)Gal on endothelium has been implicated in the rejection of porcine xenografts. The aim of this study was to determine whether expression of Galalpha(1-3)Gal on pig islets varies between pigs aged 5, 12 and 24 weeks, and to investigate whether it is expressed on islets isolated by collagenase digestion or islets maintained in tissue culture. Samples of pancreas were obtained from pigs aged 5, 12 and 24 weeks. Islets were isolated by manual collagenase digestion and density gradient separation. Samples were taken immediately after isolation or after maintenance in tissue culture. Pancreas and islet samples were processed, sectioned and stained with the lectin BS1-B4 (which binds to Galalpha(1-3)Gal residues), and anti-insulin antibody using a double staining technique. There was no significant difference in the staining patterns to sections of pancreas obtained from 5, 12 and 24 week old pigs. Vascular endothelium, connective tissue and the luminal surface of duct epithelial cells stained with BS1-B4 in all sections; endocrine and exocrine cells did not stain. Preliminary experiments showed that lectin staining to isolated islets was inconsistent between preparations, but expression did not appear to differ significantly between ages: lectin staining of some beta-cells was evident in the majority of freshly isolated preparations, but was not detectable on beta-cells following tissue culture. In conclusion, expression of Galalpha(1-3)Gal did not differ significantly in pancreata from 5, 12 and 24 week old pigs. Preliminary experiments showed that Galalpha(1-3)Gal was expressed by beta-cells immediately following isolation, but not after maintenance in culture.
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Abstract
Functional decrements of the immune system have a major contribution to aging and age-related diseases. Here, we further characterize the decline in proportion of CD28-positive T cells previously identified in centenarians. Cohorts of 97 centenarians, 40 subjects aged 70-90 (ELD group), and 40 young adults (under age 40) were phenotyped for T cell surface expression of CD28, CD4, and CD8 antigens. The significant decline in T cells expressing CD28 (p < 10(-4) for comparisons between adults and either ELD or centenarians) affects preferentially the CD8+ subset of T cells. This decline accounts largely for the age-related diminution of T cell responsiveness to mitogenic signals. CD28 expression is modulated in T cell cultures in a growth-related fashion and this modulation is dampened in cultures from centenarians. We propose that the decrease in CD28 expression reflects a compensatory adaptation of the immune system during aging in the face of chronic stimulation.
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Influence de l'interféron sur l'évolution de la porphyrie cutanée tardive associée à l'hépatite C. Rev Med Interne 1998. [DOI: 10.1016/s0248-8663(98)90064-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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[Cellular senescence and survival of T lymphocytes]. COMPTES RENDUS DE L'ACADEMIE DES SCIENCES. SERIE III, SCIENCES DE LA VIE 1995; 318:563-572. [PMID: 7671003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In order to study cellular senescence in T lymphocytes and its link with aging, we have undertaken long-term cultures from adult individuals (aged from 20 to 40) and centenarians. The proliferative advantage of CD4+ over CD8+ T cells is reversed after the second stimulation. Periodically stimulated cultures remained exponentially growing during nearly 200 days, whereas 2 of them that were continued for 300 days stopped proliferating. However, once this phase of senescence is reached, the cells do not die out. Six other cultures remained viable for 34 months without proliferation but with conservation of the cell number. Three of these cultures have clonal karyotypic abnormalities: trisomy 2 and telomeric fusions.
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Decline in CD28+ T cells in centenarians and in long-term T cell cultures: a possible cause for both in vivo and in vitro immunosenescence. Exp Gerontol 1994; 29:601-9. [PMID: 9435913 DOI: 10.1016/0531-5565(94)90073-6] [Citation(s) in RCA: 266] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The dramatic decline in immune function with age, especially in T cell proliferative activity, has been documented extensively in experimental animal models and in clinical studies of the elderly. A similar proliferative decline is also seen in long-term T lymphocyte cultures used to study in vitro cellular senescence. We have compared the peripheral blood T lymphocytes of centenarians and younger controls for the cell surface expression of CD28, a costimulatory molecule that is required for optimal activation and proliferation following engagement of the T cell receptor. Our analysis shows a significant decrease (p < 0.001) in the percentage of T cells expressing CD28 in the elderly cohort, with values ranging from 44% to 90%, as compared to the mean control value of 91%. The decline in the percentage of CD28+ T cells correlates with a reduction in the CD4/CD8 ratio (r2 = 0.695, p < 0.0001). Concommitantly, experiments using an in vitro T cell culture system showed a progressive loss of CD28 expression with culture "age." The concordance of proliferative decline and loss of CD28 in the centenarians and in the in vitro cultures suggest that a Hayflick phenomenon may operate in vivo leading to immunosenescence.
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Heat-stress stimulation of oxygen uptake by Photosystem I involves the reduction of superoxide radicals by specific electron donors. PHOTOSYNTHESIS RESEARCH 1993; 35:213-218. [PMID: 24318751 DOI: 10.1007/bf00016552] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/1992] [Accepted: 08/12/1992] [Indexed: 06/02/2023]
Abstract
A Photosystem I submembrane fraction isolated from spinach was used to study the mechanism of heat-stress stimulation of oxygen uptake by the photosystem. Various artificial electron donors were shown to generate electron transport reactions with various degrees of thermally induced stimulation. A strong stimulation was observed with durohydroquinone as electron donor with a maximal effect at 50 °C. The degree of stimulation obtained was independent from the redox potential of the electron donors and from their oxidation site because the enzyme superoxide dismutase fully inhibited the stimulation. Instead, it is proposed that thermal stress causes the release of membrane bound superoxide dismutase from the thylakoids thus allowing the reduced form of electron donors with specific properties to reduce O2 (-) radicals to H2O2 besides the usual disproportionation of O2 (-) into O2 and H2O2.
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Heat-stress stimulation of electron flow in a photosystem I submembrane fraction. Biochem Cell Biol 1990; 68:999-1004. [PMID: 2223018 DOI: 10.1139/o90-147] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Oxygen uptake using methyl viologen as the terminal electron acceptor was recorded in digitonin-derived photosystem I submembrane fractions incubated at either 25 or 50 degrees C. A two- to four-fold heat-stress stimulation of electron flow was detected at 50 degrees C when reduced 2,6-dichlorophenol-indophenol was used as the primary electron donor. However, no stimulation was seen with N,N,N',N'-tetramethylphenylenediamine as the donor. The stimulation was enhanced by specific cations (Mg2+, Na+, K+), but not by Mn2 or Ca2+. The enhancement obtained with Mg2+ could be eliminated by incubating for a prolonged period. It is proposed that the observed heat-stress stimulation is due to a conformational change at the level of the cytochrome b6-f complex. This change increased the affinity of the protein complex for 2,6-dichlorophenol-indophenol at its oxidation sites. The involvement of a conformational modification is demonstrated by the absence of heat-stress stimulation in submembrane fractions immobilized in an albumin-glutaraldehyde cross-linked matrix.
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