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McHugh C, Hurst A, Bethel A, Lloyd J, Logan S, Wyatt K. The impact of the World Health Organization Health Promoting Schools framework approach on diet and physical activity behaviours of adolescents in secondary schools: a systematic review. Public Health 2020; 182:116-124. [PMID: 32259722 DOI: 10.1016/j.puhe.2020.02.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 12/05/2019] [Accepted: 02/05/2020] [Indexed: 10/24/2022]
Abstract
OBJECTIVE To examine the effectiveness of interventions using the World Health Organization Health Promoting Schools (HPSs) framework approach in increasing physical activity (PA) and improving the diet of 11-18-year-olds. STUDY DESIGN A systematic review guided by the National Health Services Centre for Reviews and Dissemination framework and reported in accordance with the Preferred Reporting Items for Systematic reviews and Meta-Analyses. METHODS Nine databases and trial registries were searched from 2013 to 2018 for cluster randomised controlled trials involving adolescents' aged 11-18 years. We also included relevant studies from a 2014 Cochrane Review of HPS approach on health behaviours. Data were extracted from included studies and assessed for quality. RESULTS Twelve eligible studies were identified from seven countries. The studies varied in outcome measures, sample size, quality and duration of intervention and follow-up. Only four of the included studies were of high to moderate quality. We found some evidence of effectiveness for physical activity only interventions and limited evidence of effectiveness for nutrition only and combined PA and nutrition interventions. CONCLUSIONS There were no discernible patterns across the studies to suggest effective mechanisms for the HPS approach. The family/community component was poorly developed and superficially reported in all studies. Future research should seek to understand how best to work in partnership with secondary schools, to foster and sustain a healthy eating and physical activity culture, which aligns with their core aims. More attention should be paid to the restriction of unhealthy foods in the school environment.
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Affiliation(s)
- C McHugh
- University of Exeter Medical School, South Cloisters, St Luke's Campus, Exeter, Devon EX1 2LU, UK.
| | - A Hurst
- University of Exeter Medical School, South Cloisters, St Luke's Campus, Exeter, Devon EX1 2LU, UK.
| | - A Bethel
- University of Exeter Medical School, South Cloisters, St Luke's Campus, Exeter, Devon EX1 2LU, UK.
| | - J Lloyd
- University of Exeter Medical School, South Cloisters, St Luke's Campus, Exeter, Devon EX1 2LU, UK.
| | - S Logan
- University of Exeter Medical School, South Cloisters, St Luke's Campus, Exeter, Devon EX1 2LU, UK.
| | - K Wyatt
- University of Exeter Medical School, South Cloisters, St Luke's Campus, Exeter, Devon EX1 2LU, UK.
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Thomas F, Hansford L, Ford J, Wyatt K, McCabe R, Byng R. How accessible and acceptable are current GP referral mechanisms for IAPT for low-income patients? Lay and primary care perspectives. J Ment Health 2019; 29:706-711. [DOI: 10.1080/09638237.2019.1677876] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- F. Thomas
- College of Medicine and Health, University of Exeter, Exeter, UK
| | - L. Hansford
- College of Medicine and Health, University of Exeter, Exeter, UK
| | - J. Ford
- College of Medicine and Health, University of Exeter, Exeter, UK
| | - K. Wyatt
- College of Medicine and Health, University of Exeter, Exeter, UK
| | - R. McCabe
- School of Health Sciences, City University, London, UK
| | - R. Byng
- Community and Primary Care Research Group, University of Plymouth, Plymouth, UK
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Lloyd J, McHugh C, Minton J, Eke H, Wyatt K. The impact of active stakeholder involvement on recruitment, retention and engagement of schools, children and their families in the cluster randomised controlled trial of the Healthy Lifestyles Programme (HeLP): a school-based intervention to prevent obesity. Trials 2017; 18:378. [PMID: 28807006 PMCID: PMC5557526 DOI: 10.1186/s13063-017-2122-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 07/20/2017] [Indexed: 11/10/2022] Open
Abstract
Background Recruitment and retention of participants is crucial for statistical power and internal and external validity and participant engagement is essential for behaviour change. However, many school-based interventions focus on programme content rather than the building of supportive relationships with all participants and tend to employ specific standalone strategies, such as incentives, to improve retention. We believe that actively involving stakeholders in both intervention and trial design improves recruitment and retention and increases the chances of creating an effective intervention. Methods The Healthy Lifestyles Programme, HeLP (an obesity prevention programme for children 9–10 years old) was developed using intervention mapping and involved extensive stakeholder involvement in both the design of the trial and the intervention to ensure that: (i) delivery methods were suitably engaging, (ii) deliverers had the necessary skills and qualities to build relationships and (iii) the intervention dovetailed with the National Curriculum. HeLP was a year-long intervention consisting of 4 multi-component phases using a range of delivery methods. We recruited 1324 children from 32 schools from the South West of England to a cluster-randomised controlled trial to determine the effectiveness of HeLP in preventing obesity. The primary outcome was change in body mass index standard deviation score (BMI SDS) at 24 months post randomisation. Secondary outcomes included additional anthropometric and behavioural (physical activity and diet) measures at 18 and 24 months. Results Anthropometric and behavioural measures were taken in 99%, 96% and 94% of children at baseline, 18 and 24 months, respectively, with no differential follow up between the control and intervention groups at each time point. All children participated in the programme and 92% of children and 77% of parents across the socio-economic spectrum were considered to have actively engaged with HeLP. Conclusions We attribute our excellent retention and engagement results to the high level of stakeholder involvement in both trial and intervention design, the building of relationships using appropriate personnel and creative delivery methods that are accessible to children and their families across the social spectrum. Trial registration International Standard Randomised Controlled Trials Register, ISRCTN15811706. Registered on 1 May 2012.
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Affiliation(s)
- J Lloyd
- University of Exeter Medical School, University of Exeter, St Luke's Campus, Heavitree Road, Exeter, EX1 2 LU, UK.
| | - C McHugh
- University of Exeter Medical School, University of Exeter, St Luke's Campus, Heavitree Road, Exeter, EX1 2 LU, UK
| | - J Minton
- University of Exeter Medical School, University of Exeter, St Luke's Campus, Heavitree Road, Exeter, EX1 2 LU, UK
| | - H Eke
- University of Exeter Medical School, University of Exeter, St Luke's Campus, Heavitree Road, Exeter, EX1 2 LU, UK
| | - K Wyatt
- University of Exeter Medical School, University of Exeter, St Luke's Campus, Heavitree Road, Exeter, EX1 2 LU, UK
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Setyo L, Ma M, Bunn T, Wyatt K, Wang P. Furosemide for prevention of cyclophosphamide-associated sterile haemorrhagic cystitis in dogs receiving metronomic low-dose oral cyclophosphamide. Vet Comp Oncol 2017; 15:1468-1478. [DOI: 10.1111/vco.12292] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 10/23/2016] [Accepted: 10/24/2016] [Indexed: 11/30/2022]
Affiliation(s)
- L. Setyo
- Perth Veterinary Oncology; Perth Veterinary Specialists; Perth Australia
| | - M. Ma
- Perth Veterinary Oncology; Perth Veterinary Specialists; Perth Australia
| | - T. Bunn
- Perth Veterinary Oncology; Perth Veterinary Specialists; Perth Australia
| | - K. Wyatt
- Perth Veterinary Oncology; Perth Veterinary Specialists; Perth Australia
| | - P. Wang
- School of Veterinary and Life Sciences; Murdoch University; Murdoch Australia
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Wyatt K, Pallagi P, Willaert B, Yiannias J, Hellmich T. 146 Clinical Photography Using a Mobile Application in the Emergency Department: Our Institutional Experience. Ann Emerg Med 2016. [DOI: 10.1016/j.annemergmed.2016.08.158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Pearson M, Chilton R, Wyatt K, Abraham C, Ford T, Woods HB, Anderson R. Implementing health promotion programmes in schools: a realist systematic review of research and experience in the United Kingdom. Implement Sci 2015; 10:149. [PMID: 26510493 PMCID: PMC4625879 DOI: 10.1186/s13012-015-0338-6] [Citation(s) in RCA: 138] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 10/14/2015] [Indexed: 11/16/2022] Open
Abstract
Background Schools have long been viewed as a good setting in which to encourage healthy lifestyles amongst children, and schools in many countries aspire to more comprehensive, integrated approaches to health promotion. Recent reviews have identified evidence of the effects of school health promotion on children’s and young people’s health. However, understanding of how such programmes can be implemented in schools is more limited. Methods We conducted a realist review to identify the conditions and actions which lead to the successful implementation of health promotion programmes in schools. We used the international literature to develop programme theories which were then tested using evaluations of school health promotion programmes conducted in the United Kingdom (UK). Iterative searching and screening was conducted to identify sources and clear criteria applied for appraisal of included sources. A review advisory group comprising educational and public health practitioners, commissioners, and academics was established at the outset. Results In consultation with the review advisory group, we developed four programme theories (preparing for implementation, initial implementation, embedding into routine practice, adaptation and evolution); these were then refined using the UK evaluations in the review. This enabled us to identify transferable mechanisms and enabling and constraining contexts and investigate how the operation of mechanisms differed in different contexts. We also identified steps that should be taken at a senior level in relation to preparing for implementation (which revolved around negotiation about programme delivery) and initial implementation (which centred on facilitation, support, and reciprocity—the latter for both programme deliverers and pupils). However, the depth and rigour of evidence concerning embedding into routine practice and adaptation and evolution was limited. Conclusions Our findings provide guidance for the design, implementation, and evaluation of health promotion in schools and identify the areas where further research is needed. Electronic supplementary material The online version of this article (doi:10.1186/s13012-015-0338-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- M Pearson
- Institute of Health Research, University of Exeter Medical School, St Luke's Campus, Exeter, EX1 2LU, UK.
| | - R Chilton
- Institute of Health Research, University of Exeter Medical School, St Luke's Campus, Exeter, EX1 2LU, UK.
| | - K Wyatt
- Institute of Health Research, University of Exeter Medical School, St Luke's Campus, Exeter, EX1 2LU, UK.
| | - C Abraham
- Institute of Health Research, University of Exeter Medical School, St Luke's Campus, Exeter, EX1 2LU, UK.
| | - T Ford
- Institute of Health Research, University of Exeter Medical School, St Luke's Campus, Exeter, EX1 2LU, UK.
| | - H B Woods
- School of Health and Related Research, University of Sheffield, Regent Court, 30 Regent Street, Sheffield, S1 4DA, UK.
| | - R Anderson
- Institute of Health Research, University of Exeter Medical School, St Luke's Campus, Exeter, EX1 2LU, UK.
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Pearson M, Chilton R, Wyatt K, Abraham C, Ford T, Woods HB, Anderson R. Implementing health promotion programmes in schools: a realist systematic review of research and experience in the United Kingdom. Implement Sci 2015. [PMID: 26510493 DOI: 10.1186/s13012–015–0338–6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Schools have long been viewed as a good setting in which to encourage healthy lifestyles amongst children, and schools in many countries aspire to more comprehensive, integrated approaches to health promotion. Recent reviews have identified evidence of the effects of school health promotion on children's and young people's health. However, understanding of how such programmes can be implemented in schools is more limited. METHODS We conducted a realist review to identify the conditions and actions which lead to the successful implementation of health promotion programmes in schools. We used the international literature to develop programme theories which were then tested using evaluations of school health promotion programmes conducted in the United Kingdom (UK). Iterative searching and screening was conducted to identify sources and clear criteria applied for appraisal of included sources. A review advisory group comprising educational and public health practitioners, commissioners, and academics was established at the outset. RESULTS In consultation with the review advisory group, we developed four programme theories (preparing for implementation, initial implementation, embedding into routine practice, adaptation and evolution); these were then refined using the UK evaluations in the review. This enabled us to identify transferable mechanisms and enabling and constraining contexts and investigate how the operation of mechanisms differed in different contexts. We also identified steps that should be taken at a senior level in relation to preparing for implementation (which revolved around negotiation about programme delivery) and initial implementation (which centred on facilitation, support, and reciprocity-the latter for both programme deliverers and pupils). However, the depth and rigour of evidence concerning embedding into routine practice and adaptation and evolution was limited. CONCLUSIONS Our findings provide guidance for the design, implementation, and evaluation of health promotion in schools and identify the areas where further research is needed.
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Affiliation(s)
- M Pearson
- Institute of Health Research, University of Exeter Medical School, St Luke's Campus, Exeter, EX1 2LU, UK.
| | - R Chilton
- Institute of Health Research, University of Exeter Medical School, St Luke's Campus, Exeter, EX1 2LU, UK.
| | - K Wyatt
- Institute of Health Research, University of Exeter Medical School, St Luke's Campus, Exeter, EX1 2LU, UK.
| | - C Abraham
- Institute of Health Research, University of Exeter Medical School, St Luke's Campus, Exeter, EX1 2LU, UK.
| | - T Ford
- Institute of Health Research, University of Exeter Medical School, St Luke's Campus, Exeter, EX1 2LU, UK.
| | - H B Woods
- School of Health and Related Research, University of Sheffield, Regent Court, 30 Regent Street, Sheffield, S1 4DA, UK.
| | - R Anderson
- Institute of Health Research, University of Exeter Medical School, St Luke's Campus, Exeter, EX1 2LU, UK.
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Finlay J, Wyatt K, Black M. Evaluation of the risks of chemotherapy in dogs with thrombocytopenia. Vet Comp Oncol 2015; 15:151-162. [PMID: 25864417 DOI: 10.1111/vco.12146] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Revised: 01/22/2015] [Accepted: 01/27/2015] [Indexed: 01/15/2023]
Abstract
Thrombocytopenia is commonly encountered in veterinary oncology. Currently, there are no standard guidelines regarding the administration of chemotherapy to the patients with thrombocytopenia. This observational epidemiological cohort study aimed to determine whether thrombocytopenic dogs were at increased risk of gastrointestinal adverse effects (vomiting, diarrhoea, inappetence) or haemorrhage following administration of standard doses of chemotherapy. The adverse effects following 77 prospectively identified episodes of thrombocytopenia (platelet count, <200 000 µL-1 ) were compared with the adverse effects experienced in a retrospective cohort (platelet count >200 000 µL-1 ), and evaluated by statistical analysis. Overall, there was no statistically significant difference in the incidence of gastrointestinal adverse effects or haemorrhage between thrombocytopenic and control dogs. The control group of dogs with lymphoma were statistically more likely to experience vomiting as an adverse effect of chemotherapy (P = 0.028). The results presented here showed no evidence for an increased risk of gastrointestinal adverse effects or haemorrhage in thrombocytopenic dogs after receiving standard doses of chemotherapy.
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Affiliation(s)
- J Finlay
- Perth Veterinary Oncology, Perth, Australia
| | - K Wyatt
- Perth Veterinary Oncology, Perth, Australia
| | - M Black
- Centre for Comparative Genomics, Murdoch University, Perth, Australia
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Snape D, Kirkham J, Britten N, Froggatt K, Gradinger F, Lobban F, Popay J, Wyatt K, Jacoby A. Exploring perceived barriers, drivers, impacts and the need for evaluation of public involvement in health and social care research: a modified Delphi study. BMJ Open 2014; 4:e004943. [PMID: 24939808 PMCID: PMC4067891 DOI: 10.1136/bmjopen-2014-004943] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVE To explore areas of consensus and conflict in relation to perceived public involvement (PI) barriers and drivers, perceived impacts of PI and ways of evaluating PI approaches in health and social care research. BACKGROUND Internationally and within the UK the recognition of potential benefits of PI in health and social care research is gathering momentum and PI is increasingly identified by organisations as a prerequisite for funding. However, there is relatively little examination of the impacts of PI and how those impacts might be measured. DESIGN Mixed method, three-phase, modified Delphi technique, conducted as part of a larger MRC multiphase project. SAMPLE Clinical and non-clinical academics, members of the public, research managers, commissioners and funders. FINDINGS This study found high levels of consensus about the most important barriers and drivers to PI. There was acknowledgement that tokenism was common in relation to PI; and strong support for the view that demonstrating the impacts and value of PI was made more difficult by tokenistic practice. PI was seen as having intrinsic value; nonetheless, there was clear support for the importance of evaluating its impact. Research team cohesion and appropriate resources were considered essential to effective PI implementation. Panellists agreed that PI can be challenging, but can be facilitated by clear guidance, together with models of good practice and measurable standards. CONCLUSIONS This study is the first to present empirical evidence of the opinions voiced by key stakeholders on areas of consensus and conflict in relation to perceived PI barriers and drivers, perceived impacts of PI and the need to evaluate PI. As such it further contributes to debate around best practice in PI, the potential for tokenism and how best to evaluate the impacts of PI. These findings have been used in the development of the Public Involvement Impact Assessment Framework (PiiAF), an online resource which offers guidance to researchers and members of the public involved in the PI process.
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Affiliation(s)
- D Snape
- Department of Public Health and Policy, University of Liverpool, Liverpool, UK
| | - J Kirkham
- Department of Biostatistics, University of Liverpool, Liverpool, UK
| | - N Britten
- Institute of Health Research, University of Exeter Medical School, Exeter, UK
| | - K Froggatt
- Division of Health Research, Lancaster University, Lancaster, UK
| | - F Gradinger
- Institute of Health Research, University of Exeter Medical School, Exeter, UK
| | - F Lobban
- Division of Health Research, Lancaster University, Lancaster, UK
| | - Jennie Popay
- Division of Health Research, Lancaster University, Lancaster, UK
| | - K Wyatt
- Institute of Health Research, University of Exeter Medical School, Exeter, UK
| | - Ann Jacoby
- Department of Public Health and Policy, University of Liverpool, Liverpool, UK
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Snape D, Kirkham J, Preston J, Popay J, Britten N, Collins M, Froggatt K, Gibson A, Lobban F, Wyatt K, Jacoby A. Exploring areas of consensus and conflict around values underpinning public involvement in health and social care research: a modified Delphi study. BMJ Open 2014; 4:e004217. [PMID: 24413356 PMCID: PMC3902382 DOI: 10.1136/bmjopen-2013-004217] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
OBJECTIVE There is growing interest in the potential benefits of public involvement (PI) in health and social care research. However, there has been little examination of values underpinning PI or how these values might differ for different groups with an interest in PI in the research process. We aimed to explore areas of consensus and conflict around normative, substantive and process-related values underpinning PI. DESIGN Mixed method, three-phase, modified Delphi study, conducted as part of a larger multiphase project. SETTING The UK health and social care research community. PARTICIPANTS Stakeholders in PI in research, defined as: clinical and non-clinical academics, members of the public, research managers, commissioners and funders; identified via research networks, online searches and a literature review. RESULTS We identified high levels of consensus for many normative, substantive and process-related issues. However, there were also areas of conflict in relation to issues of bias and representativeness, and around whether the purpose of PI in health and social care research is to bring about service change or generate new knowledge. There were large differences by group in the percentages endorsing the ethical justification for PI and the argument that PI equalises power imbalances. With regard to practical implementation of PI, research support infrastructures were reported as lacking. Participants reported shortcomings in the uptake and practice of PI. Embedding PI practice and evaluation in research study designs was seen as fundamental to strengthening the evidence base. CONCLUSIONS Our findings highlight the extent to which PI is already embedded in research. However, they also highlight a need for 'best practice' standards to assist research teams to understand, implement and evaluate PI. These findings have been used in developing a Public Involvement Impact Assessment Framework (PiiAF), which offers guidance to researchers and members of the public involved in the PI process.
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Affiliation(s)
- D Snape
- Department of Public Health and Policy, University of Liverpool, Liverpool, UK
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Wyatt K, Henley W, Anderson L, Anderson R, Nikolaou V, Stein K, Klinger L, Hughes D, Waldek S, Lachmann R, Mehta A, Vellodi A, Logan S. The effectiveness and cost-effectiveness of enzyme and substrate replacement therapies: a longitudinal cohort study of people with lysosomal storage disorders. Health Technol Assess 2013; 16:1-543. [PMID: 23089251 DOI: 10.3310/hta16390] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVES To determine natural history and estimate effectiveness and cost of enzyme replacement therapy (ERT) and substrate replacement therapy (SRT) for patients with Gaucher disease, Fabry disease, mucopolysaccharidosis type I (MPS I), mucopolysaccharidosis type II (MPS II), Pompe disease and Niemann-Pick type C (NPC) disease. DESIGN Cohort study including prospective and retrospective clinical- and patient-reported data. Age- and gender-adjusted treatment effects were estimated using generalised linear mixed models. Treated patients contributed data before and during treatment. Untreated patients contributed natural history data. SETTING National Specialised Commissioning Group-designated lysosomal storage disorder (LSD) treatment centres in England. PARTICIPANTS Consenting adults and children with a diagnosis of Gaucher disease (n = 272), Fabry disease (n = 499), MPS I (n = 126), MPS II (n = 58), NPC (n = 58) or Pompe disease (n = 93) who had attended a treatment centre in England. INTERVENTIONS ERT and SRT. MAIN OUTCOME MEASURES Clinical outcomes chosen by clinicians to reflect disease progression for each disorder; patient-reported quality-of-life (QoL) data; cost of treatment and patient-reported service-use data; numbers of hospitalisations, outpatient and general practitioner appointments; medication use; data pertaining to associated family/carer costs and QoL impacts. RESULTS Seven hundred and eleven adults and children were recruited. In those with Gaucher disease (n = 175) ERT was associated with improved platelet count, haemoglobin, liver function and reduced risk of enlarged liver or spleen. No association was found between ERT and QoL. In patients with Fabry disease (n = 311) increased time on ERT was associated with small decreases in left ventricular mass and improved glomerular filtration rate, but not with changes in risk of stroke/transient ischaemic attacks or the need for a hearing aid. There was a statistically significant association between duration of ERT use and worsening QoL and fatigue scores. We found no statistical difference in estimates of treatment effectiveness between the two preparations, agalsidase beta (Fabrazyme(®), Genzyme) (n = 127) and agalsidase alpha (Replagal(®), Shire HGT) (n = 91), licensed for this condition. In Pompe disease (n = 77) our data provide some evidence of a beneficial effect on muscle strength and mobility as measured by a 6-minute walk test in adult-onset patients; there were insufficient data from infantile-onset Pompe patients to estimate associations between ERT and outcome. Among subjects with MPS I (n = 68), 42 of the 43 patients with MPS I subtype Hurler's disease had undergone a bone marrow transplant. No significant associations were found between ERT and any outcome measure for the MPS I subtype Scheie disease and heparan sulphate patients. An association between duration of ERT and growth in children was the only statistically significant finding among patients with MPS II (n = 39). There were insufficient data for patients with NPC disease to draw any conclusions regarding the effectiveness of SRT. The current annual cost to the NHS of the different ERTs means that between 3.6 and 17.9 discounted quality-adjusted life-years (QALYs) for adult patients and between 2.6 and 10.5 discounted QALYs for child patients would need to be generated for each year of being on treatment for ERTs to be considered cost-effective by conventional criteria. CONCLUSIONS These data provide further evidence on the effectiveness of ERT in people with LSDs. However, the results need to be interpreted in light of the fact that the data are observational and the relative lack of power due to the small numbers of patients with MPS I, MPS II, Pompe disease and NPC disease. Future work should aim to effectively address the unanswered questions and this will require agreement on a common set of outcome measures and their consistent collection across all treatment centres. FUNDING This project was funded by the NIHR Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 16, No. 39. See the HTA programme website for further project information.
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Affiliation(s)
- K Wyatt
- Peninsula Medical School, University of Exeter, Exeter, UK
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Wyatt K, Henley W, Anderson L, Anderson R, Nikolaou V, Stein K, Klinger L, Hughes D, Waldek S, Lachmann R, Mehta A, Vellodi A, Logan S. The effectiveness and cost-effectiveness of enzyme and substrate replacement therapies: a longitudinal cohort study of people with lysosomal storage disorders. Health Technol Assess 2012. [PMID: 23089251 DOI: 10.3310/hta16390]] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVES To determine natural history and estimate effectiveness and cost of enzyme replacement therapy (ERT) and substrate replacement therapy (SRT) for patients with Gaucher disease, Fabry disease, mucopolysaccharidosis type I (MPS I), mucopolysaccharidosis type II (MPS II), Pompe disease and Niemann-Pick type C (NPC) disease. DESIGN Cohort study including prospective and retrospective clinical- and patient-reported data. Age- and gender-adjusted treatment effects were estimated using generalised linear mixed models. Treated patients contributed data before and during treatment. Untreated patients contributed natural history data. SETTING National Specialised Commissioning Group-designated lysosomal storage disorder (LSD) treatment centres in England. PARTICIPANTS Consenting adults and children with a diagnosis of Gaucher disease (n = 272), Fabry disease (n = 499), MPS I (n = 126), MPS II (n = 58), NPC (n = 58) or Pompe disease (n = 93) who had attended a treatment centre in England. INTERVENTIONS ERT and SRT. MAIN OUTCOME MEASURES Clinical outcomes chosen by clinicians to reflect disease progression for each disorder; patient-reported quality-of-life (QoL) data; cost of treatment and patient-reported service-use data; numbers of hospitalisations, outpatient and general practitioner appointments; medication use; data pertaining to associated family/carer costs and QoL impacts. RESULTS Seven hundred and eleven adults and children were recruited. In those with Gaucher disease (n = 175) ERT was associated with improved platelet count, haemoglobin, liver function and reduced risk of enlarged liver or spleen. No association was found between ERT and QoL. In patients with Fabry disease (n = 311) increased time on ERT was associated with small decreases in left ventricular mass and improved glomerular filtration rate, but not with changes in risk of stroke/transient ischaemic attacks or the need for a hearing aid. There was a statistically significant association between duration of ERT use and worsening QoL and fatigue scores. We found no statistical difference in estimates of treatment effectiveness between the two preparations, agalsidase beta (Fabrazyme(®), Genzyme) (n = 127) and agalsidase alpha (Replagal(®), Shire HGT) (n = 91), licensed for this condition. In Pompe disease (n = 77) our data provide some evidence of a beneficial effect on muscle strength and mobility as measured by a 6-minute walk test in adult-onset patients; there were insufficient data from infantile-onset Pompe patients to estimate associations between ERT and outcome. Among subjects with MPS I (n = 68), 42 of the 43 patients with MPS I subtype Hurler's disease had undergone a bone marrow transplant. No significant associations were found between ERT and any outcome measure for the MPS I subtype Scheie disease and heparan sulphate patients. An association between duration of ERT and growth in children was the only statistically significant finding among patients with MPS II (n = 39). There were insufficient data for patients with NPC disease to draw any conclusions regarding the effectiveness of SRT. The current annual cost to the NHS of the different ERTs means that between 3.6 and 17.9 discounted quality-adjusted life-years (QALYs) for adult patients and between 2.6 and 10.5 discounted QALYs for child patients would need to be generated for each year of being on treatment for ERTs to be considered cost-effective by conventional criteria. CONCLUSIONS These data provide further evidence on the effectiveness of ERT in people with LSDs. However, the results need to be interpreted in light of the fact that the data are observational and the relative lack of power due to the small numbers of patients with MPS I, MPS II, Pompe disease and NPC disease. Future work should aim to effectively address the unanswered questions and this will require agreement on a common set of outcome measures and their consistent collection across all treatment centres. FUNDING This project was funded by the NIHR Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 16, No. 39. See the HTA programme website for further project information.
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Affiliation(s)
- K Wyatt
- Peninsula Medical School, University of Exeter, Exeter, UK
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Noorian A, Gupta R, Wyatt K, Nichols J, Gershon R, Nogueira R. Impact of Point-of-Care Platelet Function Testing by VerifyNow(R) on Periprocedural Antiplatelet Therapy in Neuroendovascular Stenting (P06.211). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p06.211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Abstract
Overweight and obesity in pre-school children are an increasing problem, with poor diet and exercise habits laying the foundation for serious health risks in later life. Yet most research into childhood obesity has focused on school-age children. Two previous systematic reviews of pre-school children have included uncontrolled designs and self-report outcomes potentially biasing the results in favour of the interventions. We have conducted a systematic review of the effectiveness and cost-effectiveness of weight management schemes for the under fives restricting the inclusion criteria to controlled trials with objective measures. We found four effectiveness randomized controlled trials of prevention. No treatment or cost-effectiveness studies were found. Only one study in a Latino community showed a statistically significant advantage from the intervention in a slower rate of increase in body mass index. However, trends in decrease in body mass index and weight loss favoured the intervention groups in other studies. From the studies characteristics we hypothesize that important features to include in future interventions may be; cultural sensitivity, sustained moderate to vigorous exercise, active engagement of the parents in the programme and as role models of healthy living and active engagement of the children in nutrition education. Further randomized controlled trials are needed in this population.
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Affiliation(s)
- M Bond
- Peninsula Medical School, University of Exeter, Exeter, UK.
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Bond M, Wyatt K, Lloyd J, Welch K, Taylor R. Systematic review of the effectiveness and cost-effectiveness of weight management schemes for the under fives: a short report. Health Technol Assess 2010; 13:1-75, iii. [PMID: 20015425 DOI: 10.3310/hta13610] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE To search for, review and synthesise studies of the effectiveness and cost-effectiveness of weight management schemes for the under fives. DATA SOURCES MEDLINE [Ovid], MEDLINE In-Process [Ovid], EMBASE [Ovid], CAB [Ovid], Health Management Information Consortium [Ovid], The Cochrane Database of Systematic Reviews, Cochrane Register of Controlled Trials, Science Citation Index Expanded [Web of Science], Conference Proceedings Citation Index [The Web of Science], Database of Abstract Reviews [CRD; Centre for Reviews and Dissemination], HTA [CRD], PsycINFO [Ebsco], NHS CRD. These databases were searched from 1990 to February 2009. Supplementary internet searches were additionally conducted. REVIEW METHODS Relevant clinical effectiveness studies were identified in two stages. Titles and abstracts returned by the search strategy were examined independently by three researchers and screened for possible inclusion. Disagreements were resolved by discussion. Full texts of the identified studies were obtained. Three researchers examined these independently for inclusion or exclusion, and disagreements were again resolved by discussion. RESULTS One of the randomised controlled trials (RCTs) was from the UK. It measured the effects of a physical activity intervention for children in nurseries combined with home-based health education for their parents; this was compared to usual care. The main outcome measure was body mass index (BMI); secondary measures were weight and physical activity. At the 12-month follow-up, no statistically significant differences were found between the groups on any measure. However, a trend, favouring the intervention, was found for BMI and weight. The other two RCTs were from the USA. The larger trial investigated the effects of a combined preschool and home intervention in African American and Latino communities. Nutrition education and physical activity programmes were aimed at under fives in preschool. The home component consisted of related health education and homework for the parents, who received a small financial reward on completion. The 1- and 2-year results for the African American sites showed a significantly slower rate of increase in BMI than for results at baseline, for the intervention group than for the control group. However, in the Latino communities no such differences were found. The second US trial was a much smaller home-based parental education programme in Native American communities in the USA and Canada. The intervention consisted of a parental skills course for parents to improve their children's diet and physical activity. This was compared with a course providing skills to improve child behaviour. Follow-up was at 16 weeks and showed no significant differences between groups in BMI. CONCLUSIONS No controlled trials addressing the issue of treating obesity or evidence of cost-effectiveness studies in the under fives' population were found. From the three prevention studies, apart from the larger US trial, the interventions showed no statistically significant differences in BMI and weight between the intervention and control groups (although there was some evidence of positive trends for BMI and weight). It should also be noted that these conclusions are based on only three dissimilar studies, thereby making the drawing of firm conclusions difficult. Research is urgently needed in further well-designed UK-based RCTs of weight management schemes aimed at the prevention of obesity, that combine with cost-effectiveness studies targeted at preschool children with long-term follow-up.
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Affiliation(s)
- M Bond
- Peninsula Medical School, University of Exeter, Exeter, UK
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Abstract
OBJECTIVE To determine the effectiveness of psychosocial interventions for adolescents with AN. METHODS An extensive and systematic literature search was conducted for randomised controlled trials (RCTs) addressing the effectiveness of psychosocial interventions for teenagers (11-18 years) with AN. RESULTS Eight RCTs were located meeting the review's inclusion criteria, the majority of which focused on some form of family-related intervention. DISCUSSION Unfortunately, a lack of robust primary research on which to base the review meant that clear recommendations could not be made. More good quality research, examining a range of interventions, and involving larger samples, is required before a similar systematic review is executed.
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Affiliation(s)
- S Tierney
- The Institute for Access Studies, Staffordshire University, Stoke-on-Trent, UK.
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Wyatt K. Geriatrics and Gerontology of the Dog and Cat, 2nd edn. Hoskins JD, Saunders, Missouri, 2004, 415 Pages. Price US £89.95. ISBN 0 72168799 7. Aust Vet J 2005. [DOI: 10.1111/j.1751-0813.2005.tb11651.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Evans P, Wyatt K, Wistow GJ, Bateman OA, Wallace BA, Slingsby C. The P23T Cataract Mutation Causes Loss of Solubility of Folded γD-Crystallin. J Mol Biol 2004; 343:435-44. [PMID: 15451671 DOI: 10.1016/j.jmb.2004.08.050] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2004] [Revised: 06/02/2004] [Accepted: 08/10/2004] [Indexed: 11/17/2022]
Abstract
Mutations in the human gammaD-crystallin gene have been linked to several types of congenital cataracts. In particular, the Pro23 to Thr (P23T) mutation of human gammaD crystallin has been linked to cerulean, lamellar, coralliform, and fasciculiform congenital cataracts. We have expressed and purified wild-type human gammaD, P23T, and the Pro23 to Ser23 (P23S) mutant. Our measurements show that P23T is significantly less soluble than wild-type human gammaD, with P23S having an intermediate solubility. Using synchrotron radiation circular dichroism spectroscopy, we have determined that the P23T mutant has a slightly increased content of beta-sheet, which may be attributed to the extension of an edge beta-strand due to the substitution of Pro23 with a residue able to form hydrogen bonds. Neither of the point mutations appears to have reduced the thermal stability of the protein significantly, nor its resistance to guanidine hydrochloride-induced unfolding. These results suggest that insolubility, rather than loss of stability, is the primary basis for P23T congenital cataracts.
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Affiliation(s)
- P Evans
- Department of Crystallography, Birkbeck College, Malet Street, London WC1E 7HX, UK
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Garside R, Stein K, Wyatt K, Round A, Price A. The effectiveness and cost-effectiveness of microwave and thermal balloon endometrial ablation for heavy menstrual bleeding: a systematic review and economic modelling. Health Technol Assess 2004; 8:iii, 1-155. [PMID: 14754561 DOI: 10.3310/hta8030] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVES To estimate the clinical effectiveness and cost-effectiveness of microwave endometrial ablation (MEA) and thermal balloon endometrial ablation (TBEA) for heavy menstrual bleeding (HMB), compared with the existing (first-generation) endometrial ablation (EA) techniques of transcervical resection (TCRE) and rollerball (RB) ablation, and hysterectomy. DATA SOURCES Electronic databases, bibliographies of articles, and also experts in the field and relevant industry bodies were asked to provide information. REVIEW METHODS A detailed search strategy was carried out to identify systematic reviews and controlled trials of MEA and TBEA versus first-generation techniques for EA. In addition to electronic database searching, reference lists were hand-searched and information sought from manufacturers of EA devices and by experts in the field. A deterministic Markov model was developed to assess cost-effectiveness. Data for the model were taken from a range of sources. RESULTS The systematic review of first-generation EA techniques versus hysterectomy found that EA offered an alternative to hysterectomy for HMB, with fewer complications and a shorter recovery period. Satisfaction and effectiveness were high for both MEA and TBEA. Costs were lower with EA although the difference narrows over time. Second-generation EA techniques are an alternative treatment to first-generation techniques for HMB, and first-generation techniques are known to offer an alternative to hysterectomy. Although no trials of second-generation techniques and hysterectomy have been undertaken, it seems reasonable to assume that second-generation techniques also offer an alternative surgical treatment. Using the model to assess cost-effectiveness, costs were very slightly higher for MEA when compared to TBEA, and differences in quality-adjusted life-years (QALYs) were negligible. For MEA compared with transcervical resection of the endometrium (TCRE) and RB ablation, costs were slightly lower with MEA and MEA accrued very slightly more QALYs. Compared with hysterectomy, MEA costs less and accrues slightly fewer QALYs. For TBEA compared with TCRE and RB ablation, costs were lower with TBEA and TBEA accrued slightly more QALYs. Compared with hysterectomy, TBEA costs moderately less and accrues moderately fewer QALYs. CONCLUSIONS Overall, there were few significant differences between the outcomes of first- and second-generation techniques including bleeding, satisfaction and QoL measures and repeat surgery rates. Second-generation techniques had significantly shorter operating and theatre times and there appear to be fewer serious perioperative adverse effects with second-generation techniques and postoperative effects are similar. Compared with hysterectomy, TCRE and RB are quicker to perform and result in shorter hospitalisation and faster return to work. Hysterectomy results in more adverse effects and is more expensive, although the need for retreatment leads this difference to decrease over time. Satisfaction with hysterectomy is initially higher, but there is no significant difference after 2 years. The economic model suggests that second-generation techniques are more cost-effective than first-generation techniques of EA for HMB. Both TBEA and MEA appear to be less costly than hysterectomy, although the latter results in more QALYs. Further research is suggested to make direct comparisons of the cost-effectiveness of second-generation EA techniques, to carry out longer term follow-up for all methods of EA in RCTs, and to develop more sophisticated modelling studies. Further research is also recommended into HMB to establish health-state utility values, its surgical treatment, convalescence, complications of treatment, symptoms and patient satisfaction.
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Affiliation(s)
- R Garside
- Peninsular Technology Assessment Group, Peninsula Medical School, Universities of Exeter and Plymouth, UK
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Abstract
An 18-month-old, male greylag goose was presented for assessment of multiple, semi-pedunculated cutaneous masses limited to non-feathered areas of skin. Initial biopsy and histopathology revealed a mesenchymal neoplasm suggestive of lipoblastomatosis or atypical xanthoma. Immunohistochemistry was unsuccessful in determining the tissue type of origin. Surgical resection of all masses was prevented by the mucocutaneous location of several masses. Chemotherapy using intralesion cisplatin was unsuccessful in resolving the masses but was well-tolerated by the goose. Serum lipid and lipoprotein analysis revealed a persistent hypercholesterolaemia and hypertriglyceridaemia without biochemical evidence of an underlying metabolic disease. The persistent hyperlipidaemia may have contributed to the formation of the masses identified in this case.
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Affiliation(s)
- S M Jaensch
- Murdoch University, Division of Veterinary Sciences, Western Australia
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Abstract
A 4-year-old spayed female Golden Retriever was presented for investigation of progressive loss of bark, continuous panting and increased upper respiratory noise. Examination of the larynx and pharynx under general anaesthesia identified a spherical 5 x 3 cm mass involving the right arytenoid cartilage. Cytological examination of fine needle aspirates from the mass suggested the tumour was a carcinoma, however histological examination in association with immunoperoxidase and histochemical staining identified the mass as a laryngeal rhabdomyoma.
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Affiliation(s)
- A J O'Hara
- Division of Veterinary and Biomedical Science, Murdoch University, Western Australia.
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Wyatt K, Dimmock P, Jones P, Obhrai M, O'Brien S. Efficacy of progesterone and progestogens in management of premenstrual syndrome: systematic review. BMJ 2001; 323:776-80. [PMID: 11588078 PMCID: PMC57352 DOI: 10.1136/bmj.323.7316.776] [Citation(s) in RCA: 111] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVE To evaluate the efficacy of progesterone and progestogens in the management of premenstrual syndrome. DESIGN Systematic review of published randomised, placebo controlled trials. STUDIES REVIEWED 10 trials of progesterone therapy (531 women) and four trials of progestogen therapy (378 women). MAIN OUTCOME MEASURES Proportion of women whose symptoms showed improvement with progesterone preparations (suppositories and oral micronised). Proportion of women whose symptoms showed improvement with progestogens. Secondary analysis of efficacy of progesterone and progestogens in managing physical and behavioural symptoms. RESULTS Overall standardised mean difference for all trials that assessed efficacy of progesterone (by both routes of administration) was -0.028 (95% confidence interval -0.017 to -0.040). The odds ratio was 1.05 (1.03 to 1.08) in favour of progesterone, indicating no clinically important difference between progesterone and placebo. For progestogens the overall standardised mean was -0.036 (-0.014 to -0.060), which corresponds to an odds ratio of 1.07 (1.03 to 1.11) showing a statistically, but not clinically, significant improvement for women taking progestogens. CONCLUSION The evidence from these meta-analyses does not support the use of progesterone or progestogens in the management of premenstrual syndrome.
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Affiliation(s)
- K Wyatt
- Academic Department of Obstetrics and Gynaecology, Keele University and North Staffordshire Hospital, Stoke-on-Trent ST4 6QG
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Talty J, Sheese J, Gunn S, Stone J, Chappelow M, Wyatt K, Cox M, Bull M. Implementing a comprehensive child restraint program in a pediatric hospital: an effective model. Pediatr Nurs 2000; 26:619-24. [PMID: 12026365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Motor vehicle crashes remain a leading cause of death and injury to young children. Appropriate child safety seats and child safety restraints can provide life-saving protection to children riding in motor vehicles. Many children, however, travel unrestrained or improperly restrained. Consideration of appropriate child safety restraint systems for children is an important aspect of discharge planning and can provide families with the means to prevent unintentional injuries and deaths resulting from motor vehicle crashes.
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Affiliation(s)
- J Talty
- Automotive Safety for Children Program, Indiana University School of Medicine, Indianapolis, IN, USA
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O'Brien PM, Wyatt K, Dimmock P. Premenstrual syndrome is real and treatable. Practitioner 2000; 244:185-9, 191, 194-5. [PMID: 10859805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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Abstract
Student evaluations incorporated into feedback for instruction modification are an important aspect of any educational program. It is particularly important for healthcare programs in which teaching processes are continually dynamic. An interactive evaluation was designed and implemented on-line for students. Confidentiality was assured and privacy protected through a unique coding system. Our experience with the interactive, automated system proved particularly successful with respondents and faculty expectations have improved since its integration into course and clinical objectives.
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Yeh JJ, Harton A, Wyatt K. Reliability Study of Holographic Optical Elements Made with DuPont Photopolymer. Appl Opt 1998; 37:6270-6274. [PMID: 18286127 DOI: 10.1364/ao.37.006270] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We report reliability-test results of transmission-type holographic optical elements (HOE's) made with the DuPont photopolymer HRF-600. The reliability tests performed include 6000 cycles of liquid-to-liquid thermal-shock cycling (-55 degrees C-125 degrees C), 2200 cycles of air-to-air thermal cycling (-55 degrees C-125 degrees C), 1500 h of humidity testing (85 degrees C and a relative humidity of 85%), and 675 h of burn-in testing at 125 degrees C. A total of 210 holograms was tested, with 532 data points collected for diffraction-efficiency measurements. The results show that the average efficiency change after these tests is in the range of -4% to 0% and the standard deviation is only ~10%.
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Wyatt K. "Down, boy!". Emerg Med Serv 1994; 23:61-3. [PMID: 10132477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Wyatt K. 1993 EMT/paramedic of the year. Emerg Med Serv 1993; 22:50-2. [PMID: 10161010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Wyatt K. TV or not TV? Emerg Med Serv 1993; 22:24, 26. [PMID: 10130545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Wyatt K, Cherry RJ. Effect of membrane potential on band 3 conformation in the human erythrocyte membrane detected by triplet state quenching experiments. Biochemistry 1992; 31:4650-6. [PMID: 1374640 DOI: 10.1021/bi00134a016] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The triplet lifetime and absorption anisotropy decay of eosin-labeled band 3 was measured in resealed erythrocyte ghosts. Membrane potentials were generated by the addition of valinomycin in the presence of a K+ gradient. Neither negative nor positive membrane potentials had any detectable effect on the rotational diffusion of band 3 nor on the eosin triplet lifetime. The membrane potential did, however, affect quenching of the eosin triplet state by I- and TEMPO (2,2,6,6-tetramethylpiperidine-N-oxyl). Quenching was enhanced by a negative membrane potential (negative inside) and reduced by a positive membrane potential. In addition, it was found that a negative membrane potential enhanced the efficiency of eosin labeling of band 3 in intact erythrocytes. A positive membrane potential had the opposite effect. These results indicate that the eosin binding site on band 3 becomes more accessible to the extracellular aqueous phase in the presence of a negative membrane potential and less accessible in the presence of a positive membrane potential. Quenching by I- and TEMPO of the triplet state of eosin-labeled band 3 was further investigated as a function of pH. Quenching by TEMPO and its dependence on membrane potential were relatively insensitive to pH. In contrast, the rate of quenching by I- showed a marked decrease over the range pH 5.5-9.5. Moreover, the effect of a negative membrane potential on I- quenching also varied with pH. These results are discussed on the supposition that the eosin probe is located in the anion access channel of band 3.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- K Wyatt
- Department of Chemistry and Biological Chemistry, University of Essex, Colchester, U.K
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Wyatt K, Cherry RJ. Both ankyrin and band 4.1 are required to restrict the rotational mobility of band 3 in the human erythrocyte membrane. Biochim Biophys Acta 1992; 1103:327-30. [PMID: 1531931 DOI: 10.1016/0005-2736(92)90104-t] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A population of band 3 proteins in the human erythrocyte membrane is known to have restricted rotational mobility due to interaction with cytoskeletal proteins. We have further investigated the cause of this restriction by measuring the effects on band 3 rotational mobility of rebinding ankyrin and band 4.1 to ghosts stripped of these proteins as well as spectrin and actin. Rebinding either ankyrin or 4.1 alone has no detectable effect on band 3 mobility. Rebinding both these proteins together does, however, reimpose a restriction on band 3 rotation. The effect on band 3 rotational mobility of rebinding ankyrin and 4.1 are similar irrespective of whether or not band 4.2 is removed from the membrane. We suggest that ankyrin and 4.1 together promote the formation of slowly rotating clusters of band 3.
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Affiliation(s)
- K Wyatt
- Department of Chemistry and Biological Chemistry, University of Essex, Colchester, UK
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Wyatt K, Cherry RJ. Interaction of erythrocyte cytoskeletal proteins with band 3: rotational diffusion measurements. Biochem Soc Trans 1990; 18:940. [PMID: 2083750 DOI: 10.1042/bst0180940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- K Wyatt
- Department of Chemistry and Biological Chemistry, University of Essex, Wivenhoe Park, Colchester, U.K
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Clague MJ, Harrison JP, Morrison IE, Wyatt K, Cherry RJ. Transient dichroism studies of spectrin rotational diffusion in solution and bound to erythrocyte membranes. Biochemistry 1990; 29:3898-904. [PMID: 1693857 DOI: 10.1021/bi00468a016] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Spectrin was purified from human erythrocytes and labeled with the triplet probe eosin-5-maleimide. Rotational diffusion of spectrin was investigated by observing transient dichroism following flash excitation of the probe. Measurements were performed at 4 degrees C in solutions of varying viscosity and with spectrin rebound to spectrin/actin-depleted erythrocyte membranes. In solution, complex anisotropy decays were observed which could not be satisfactorily fitted by the equations for a rod-shaped molecule of appropriate dimensions. When spectrin was rebound to the erythrocyte membrane, a decay in the anisotropy was still present but was markedly less sensitive to solution viscosity and flatter at longer times. In order to overcome the objection that the cytoskeleton is only partially reconstituted when spectrin is rebound, a method was developed for labeling spectrin with eosin-5-maleimide in situ. Anisotropy decays for these labeled membranes exhibited features similar to those obtained for spectrin labeled in solution and subsequently rebound. Taken together, the results provide good evidence for segmental motion of spectrin when incorporated into the erythrocyte cytoskeleton. Upon increasing the temperature, the initial anisotropy ro for both rebound and in situ labeled spectrin decreases, and above 30 degrees C the measured anisotropies are small. Thus, at physiological temperature the probe is almost completely randomized by motions with correlation times less than 10 microseconds.
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Affiliation(s)
- M J Clague
- Department of Chemistry and Biological Chemistry, University of Essex, Colchester, U.K
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Gurney H, Baig I, Gordon S, Phadke K, Kearsley H, Fleming P, Wyatt K, Hughes W. A second Australian family with hemoglobin North Shore (beta 134 Val----Glu). Pathology 1987; 19:62-3. [PMID: 3588028 DOI: 10.3109/00313028709065138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A second Australian family is reported with Hemoglobin North Shore (beta 134 Val----Glu), an unstable hemoglobin, causing no clinical symptoms. All affected family members showed only mild reticulocytosis and microcytosis on the blood film, despite the strongly positive isopropanol test for Hb (hemoglobin) stability and numerous red cell inclusions. Hb North Shore constituted 31-38% of the total hemoglobin and migrated on the anodal side of Hb A at pH 8.9. The association of a mildly raised Hb A2 level and thalassemic phenotype with Hb North Shore previously reported, is confirmed in this study.
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Fleming PJ, Sumner DR, Wyatt K, Hughes WG, Melrose WD, Jupe DM, Baikie MJ. Hemoglobin Hobart or alpha 20(Bl)His----Arg: a new alpha chain hemoglobin variant. Hemoglobin 1987; 11:211-20. [PMID: 3654264 DOI: 10.3109/03630268709017887] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A new alpha chain hemoglobin variant, Hb Hobart, alpha 20(Bl)His----Arg, was detected in a 60-year-old female of British nationality. The proposita had a history of severe rheumatoid arthritis and had been treated for many years for a refractory microcytic anemia and/or iron deficiency. A hemoglobin electrophoresis screen indicated the presence of a hemoglobin variant, with electrophoretic characteristics similar to a Hb Lepore. However, the level of the variant (17.9%) and the presence of a minor variant Hb A2 band (0.4%) suggested that further investigation was indicated. The variant hemoglobin was purified by column chromatography and the alpha chain subjected to aminoethylation and tryptic digestion. Peptide mapping and amino acid analysis indicated that the histidine residue 20 had been substituted by an arginine residue. The substitution in Hb Hobart is at the first residue in the B Helix of the alpha chain of hemoglobin. As this is an externally placed amino acid in the hemoglobin molecule, a substitution at this position of the hemoglobin molecule would not be expected to cause any functional problems. A family study has shown that at least three other relatives are heterozygous for Hb Hobart. These family members have normal hematological findings.
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Affiliation(s)
- P J Fleming
- Hematology Department, Institute of Clinical Pathology and Medical Research, Westmead, N.S.W., Australia
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Trent RJ, Harris MG, Fleming PJ, Wyatt K, Hughes WG, Kronenberg H. Haemoglobin D Punjab. Interaction with alpha thalassaemia and diagnosis by gene mapping. Scand J Haematol 1984; 32:275-82. [PMID: 6322284 DOI: 10.1111/j.1600-0609.1984.tb01693.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A family which illustrates the inheritance of Hb D Punjab (a beta globin chain variant) and alpha thalassaemia is described. Interaction between Hb D Punjab and alpha thalassaemia is observed since levels of Hb D vary according to the number of alpha globin genes deleted. The technique of gene mapping has been utilised in the current study to provide definitive evidence of alpha thalassaemia and also demonstrates a novel way to identify Hb D Punjab.
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Fleming PJ, Hughes WG, Farmilo RK, Wyatt K, Cooper WN. Hemoglobin Westmead alpha 2 122(H5)His replaced by Gln beta 2: a new hemoglobin variant with the substitution in the alpha 1 beta 1 contact area. Hemoglobin 1980; 4:39-52. [PMID: 6153381 DOI: 10.3109/03630268009042372] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Fleming P, Hughes W, Farmilo R, Wyatt K, Cooper W. Haemoglobin Westmead, α2122(H5)GInβ2: A new haemoglobin variant with the substitution in the α1β1 contact area. Pathology 1980. [DOI: 10.1016/s0031-3025(16)38560-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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