17 results on '"Kletter M"'
Search Results
2. Myoglobin is a sensitive marker of increased muscle membrane vulnerability
- Author
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Driessen-Kletter, M. F., Amelink, G. J., Bär, P. R., and van Gijn, J.
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- 1990
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3. A striking correlation between muscle damage after exercise and mitochondrial dysfunction in patients with chronic external ophthalmoplegia
- Author
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Driessen-Kletter, M. F., Bär, P. R., Scholte, H. R., Hoogenraad, T. U., and Luyt-Houwen, I. E. M.
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- 1987
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4. Synthesis and characterization of bromine substituted polyacetylene, [CH 1-y Br y ] x.
- Author
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Kletter, M. J., Macdiarmid, A. G., Heeger, A. J., Faulques, E., Lefrant, S., Bernier, P., Barbarin, F., Blanc, J. P., Germain, J. P., and Robert, H.
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- 1983
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5. Resonance raman scattering from partially isomerized polyacetylene.
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Lefrant, S., Faulques, E., Lauchlan, L., Kletter, M. J., and Etemad, S.
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- 1983
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6. Synthesis and characterization of bromine substituted polyacetylene, [CH1-yBry]x
- Author
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Kletter, M. J., Macdiarmid, A. G., Heeger, A. J., Faulques, E., Lefrant, S., Bernier, P., Barbarin, F., Blanc, J. P., Germain, J. P., and Robert, H.
- Abstract
When ca. 85% cis films of the semiconducting polymer, polyacetylene, (CH)x, are first doped with bromine and then partly dehydrobrominated at 150°C, substitution of II by Br occurs to yield new semiconducting polymers of general composition [CH1-uBry]x, where y=0.003-0.23. These films have been studied using electron paramagnetic resonance (EPR), dynamic nuclear polarization (DNP), and Raman spectroscopic techniques. EPR results indicate that with an increase in bromine substitution, the linewidth (ΔHpp), g-value, and homogeneity of the samples increase. This is consistent with DNP results which suggest a decrease in the diffusion coefficient of unpaired spins as the bromine substitution level increases. Raman results are consistent with bromine substitution and indicate that essentially no change in conjugation length occurs when H is substituted by Br.
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- 1982
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7. Resonance raman scattering from partially isomerized polyacetylene
- Author
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Lefrant, S., Faulques, E., Lauchlan, L., Kletter, M. J., and Etemad, S.
- Abstract
A study of Raman scattering from partially isomerized polyacetylene films with varying cis-trans content is presented. Major differences are discovered in the dispersion of trans-(CH)x Raman bands between pure trans- and cis-rich samples. It is shown that the unusual dispersion of the trans-(CH)x Raman bands in partially isomerized samples cannot arise from a distribution of short chains. These results are discussed in terms of the complex response of the lattice to the presence of photoinjected electron-hole pairs.
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- 1982
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8. Bromine-substituted polyacetylene, [CH1yBRy]x: Synthesis and characterization
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Kletter, M. J., primary, MacDiarmid, A. G., additional, Heeger, A. J., additional, Faulques, E., additional, Lefrant, S., additional, and Bernier, P., additional
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- 1982
- Full Text
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9. Absolute Raman scattering cross sections oftrans-(CH)x
- Author
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Lauchlan, L., primary, Chen, S. P., additional, Etemad, S., additional, Kletter, M., additional, Heeger, A. J., additional, and MacDiarmid, A. G., additional
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- 1983
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10. Worsening suicidal ideation and prolonged adverse event following psilocybin administration in a clinical setting: case report and thematic analysis of one participant's experience.
- Author
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Wahba M, Hayes C, Kletter M, and McAllister-Williams RH
- Abstract
Background: Psilocybin is being investigated as a treatment for a myriad of disorders, including treatment-resistant depression. The main focus has been on positive effects, with little attention paid to negative outcomes, especially in clinical settings. Quantitative methodology limits further exploration of such events and can also miss improvements not captured on rating scales., Aims: To highlight potential adverse events of psilocybin and underline limits of quantitative methodology, calling for process evaluations alongside clinical trials., Case Presentation: This is a case of a participant in a phase 2b clinical trial of psilocybin for treatment-resistant depression who presented with increased suicidal ideation and a prolonged period of severely restricted eating following administration, leading to a period of destabilisation and a need for support. Despite the difficulties encountered and the participant's limited improvement on rating scales, she found the experience to have been helpful and led her to make changes to her life which she found beneficial. She described her experience in a written account to the authors., Method: The case was summarised and the written account was thematically analysed and synthesised into a logic model., Conclusions: Psilocybin could lead to temporary worsening of suicidal ideation and instigate prolonged adverse events that outlast its acute effects. Paradoxically, it could simultaneously lead to an improvement in functional outcomes which is not clear on depression rating scales. This calls for a qualitative exploration of serious adverse events and participant accounts to deepen our understanding of the psilocybin experience and its different outcomes.
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- 2024
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11. Interventions to increase vaccination in vulnerable groups: rapid overview of reviews.
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Norman G, Kletter M, and Dumville J
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- Humans, COVID-19 Vaccines administration & dosage, Systematic Reviews as Topic, Adolescent, Adult, SARS-CoV-2, Vulnerable Populations, COVID-19 prevention & control, Vaccination statistics & numerical data
- Abstract
Objective: Groups which are marginalised, disadvantaged or otherwise vulnerable have lower uptake of vaccinations. This differential has been amplified in COVID-19 vaccination compared to (e.g.) influenza vaccination. This overview assessed the effectiveness of interventions to increase vaccination in underserved, minority or vulnerable groups., Methods: In November 2022 we searched four databases for systematic reviews that included RCTs evaluating any intervention to increase vaccination in underserved, minority or vulnerable groups; our primary outcome was vaccination. We used rapid review methods to screen, extract data and assess risk of bias in identified reviews. We undertook narrative synthesis using an approach modified from SWiM guidance. We categorised interventions as being high, medium or low intensity, and as targeting vaccine demand, access, or providers., Results: We included 23 systematic reviews, including studies in high and low or middle income countries, focused on children, adolescents and adults. Groups were vulnerable based on socioeconomic status, minority ethnicity, migrant/refugee status, age, location or LGBTQ identity. Pregnancy/maternity sometimes intersected with vulnerabilities. Evidence supported interventions including: home visits to communicate/educate and to vaccinate, and facilitator visits to practices (high intensity); telephone calls to communicate/educate, remind/book appointments (medium intensity); letters, postcards or text messages to communicate/educate, remind/book appointments and reminder/recall interventions for practices (low intensity). Many studies used multiple interventions or components., Conclusion: There was considerable evidence supporting the effectiveness of communication in person, by phone or in writing to increase vaccination. Both high and low intensity interventions targeting providers showed effectiveness. Limited evidence assessed additional clinics or targeted services for increasing access; only home visits had higher confidence evidence showing effectiveness. There was no evidence for interventions for some communities, such as religious minorities which may intersect with gaps in evidence for additional services. None of the evidence related to COVID-19 vaccination where inequalities of outcome are exacerbated., Prospero Registration: CRD42021293355., (© 2024. The Author(s).)
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- 2024
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12. Mixed method evaluation of a learning from excellence programme for community health workers in Neno, Malawi.
- Author
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Kletter M, Harris B, Connolly E, Namathanga C, Nhlema B, Makungwa H, Chabwera B, Phiri B, and Brown C
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- Humans, Malawi, Motivation, Health Facilities, Qualitative Research, Community Health Workers, Delivery of Health Care
- Abstract
Background: Community Health Workers (CHWs) play an essential role in linking communities to facility-based healthcare. However, CHW programmes have often been hampered by low levels of staff motivation, and new tools aimed at improving staff motivation and work environment are needed. One such intervention is the "Learning from Excellence" (LfE) programme. We aimed to assess feasibility, outputs, and impact of a co-designed LfE programme on CHW motivation, in Neno District., Methods: We conducted a convergent mixed-method evaluation of the LfE programme. Co-design of the programme and forms took place between October 2019 and January 2020. LfE forms submitted between September and November 2020 were analysed using descriptive statistics and memos summarising answers to the open-ended question. To investigate experiences with LfE we conducted in-depth semi-structured interviews with key stakeholders, CHWs, and site supervisors, which were analysed thematically. A pre-post intervention questionnaire was developed to assess the impact of the co-designed LfE intervention on CHW motivation and perceived supervision. Outcomes were triangulated into a logic model., Results: In total 555 LfE forms were submitted, with 34.4% of CHWs in Neno District submitting at least one LfE report. Four themes were identified in the interviews: LfE implementation processes, experience, consequences, and recommendations. A total of 50 CHWs participated in the questionnaire in January 2020 and 46 of them completed the questionnaire in December 2020. No statistically significant differences were identified between pre-and post-LfE measurements for both motivation (Site F: p = 0.86; Site G: p = 0.31) and perceived supervision (Site F: p = 0.95; Site G: p = 0.45). A logic model, explaining how the LfE programme could impact CHWs was developed., Conclusions: Many CHWs participated in the LfE intervention between September 2020 and November 2020. LfE was welcomed by CHWs and stakeholders as it allowed them to appreciate excellent work in absence of other opportunities to do so. However, no statistically significant differences in CHW motivation and perceived supervision were identified. While the intervention was feasible in Neno District, we identified several barriers and facilitators for implementation. We developed a logic model to explain contextual factors, and mechanisms that could lead to LfE outcomes for CHWs in Neno District. The developed logic model can be used by those designing and implementing interventions like LfE for health workers., (© 2024. The Author(s).)
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- 2024
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13. Compression therapies for the treatment of venous leg ulcers: study protocol for a process evaluation in a randomised controlled trial, VenUS 6.
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Kletter M, Griffiths J, Arundel C, and Dumville J
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- Humans, Compression Bandages, Randomized Controlled Trials as Topic, Wound Healing, Varicose Ulcer diagnosis, Varicose Ulcer therapy
- Abstract
Background: The VenUS 6 parallel-group randomised controlled trial (RCT) will compare the clinical and cost-effectiveness of compression wraps, two-layer compression bandage and evidence-based compression therapy, comprising of two-layers of hosiery or four-layer bandages, for healing time of venous leg ulcers. We will conduct an embedded process evaluation to evaluate the implementation of the trial and the various compression therapies and to gain a more in-depth understanding of trial participant and nursing staff views and experiences of these therapies., Methods: This process evaluation will be a mixed-method study, embedded into a wider RCT. Qualitative data will be collected through semi-structured individual in-depth interviews with trial participants and staff members. Quantitative data will be collected using patient questionnaires and case report forms that are part of the main trial data collection process. Interview transcripts will be analysed using the Framework Analysis and interview data will be integrated with quantitative RCT data using the RE-AIM framework and the Pillar Integration Process., Discussion: We describe the protocol for a process evaluation, designed to assess the implementation of the various venous leg ulcer compression therapies as evaluated in VenUS6, and the experiences of trial participants and nursing staff using these. This protocol provides one example of how an embedded mixed-method process evaluation can be conducted., Trial Registration: ISRCTN 67321719 ( https://doi.org/10.1186/ISRCTN67321719 ). Prospectively registered on 14 September 2020. Recruitment Infographic SWAT-MRC Hub for Trials Methodology Research SWAT repository #116. Registered on 13 April 2020. Retention Thank You Card SWAT-MRC Hub for Trials Methodology Research SWAT repository #119. Registered on 13 April 2020. Retention Newsletter SWAT-MRC Hub for Trials Methodology Research SWAT repository #28. Registered on 01 July 2007. Retention Pen SWAT-MRC Hub for Trials Methodology Research SWAT repository #92. Registered on 01 April 2019., Protocol Version: V1.5, 26 May 2022., (© 2023. The Author(s).)
- Published
- 2023
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14. Adolescent undernutrition in South Asia: a scoping review.
- Author
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Estecha Querol S, Gill P, Iqbal R, Kletter M, Ozdemir N, and Al-Khudairy L
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- Adolescent, Asia epidemiology, Cross-Sectional Studies, Growth Disorders epidemiology, Growth Disorders etiology, Humans, Malnutrition epidemiology
- Abstract
Undernutrition is a growing public health challenge affecting growth and development during adolescence in many low- and middle-income countries. This scoping review maps the evidence on adolescent undernutrition (stunting, thinness and micronutrient deficiencies) in South Asia and highlights gaps in knowledge. Using Arksey and O'Malley's framework and the Joanna Briggs Institute Reviewers' Manual, the search included electronic bibliographic databases (Medline (OVID), Embase, Cochrane Library, Web of Science, CINAHL, PsycInfo, and Scopus) as well as various grey literature sources published up to March 2019. In total, 131 publications met the inclusion criteria of this review. All the included evidence used quantitative data and 115 publications used a cross-sectional design. Nearly 70% ( n = 86) of the included publications were conducted in India. Prevalence of undernutrition was reported based on different growth references and cut-offs. Evidence is divided into publications that included an intervention component ( n = 12) and publications that did not include an intervention component ( n = 116), and presented in a narrative synthesis. This scoping review provides a wide range of publications on adolescent undernutrition in South Asia and identifies future research priorities in the field.
- Published
- 2022
- Full Text
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15. A Library of Logic Models to Explain How Interventions to Reduce Diagnostic Errors Work.
- Author
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Kletter M, Melendez-Torres GJ, Lilford R, and Taylor C
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- Diagnostic Errors, Humans, Logic
- Abstract
Objectives: We aimed to create a library of logic models for interventions to reduce diagnostic error. This library can be used by those developing, implementing, or evaluating an intervention to improve patient care, to understand what needs to happen, and in what order, if the intervention is to be effective., Methods: To create the library, we modified an existing method for generating logic models. The following five ordered activities to include in each model were defined: preintervention; implementation of the intervention; postimplementation, but before the immediate outcome can occur; the immediate outcome (usually behavior change); and postimmediate outcome, but before a reduction in diagnostic errors can occur. We also included reasons for lack of progress through the model. Relevant information was extracted about existing evaluations of interventions to reduce diagnostic error, identified by updating a previous systematic review., Results: Data were synthesized to create logic models for four types of intervention, addressing five causes of diagnostic error in seven stages in the diagnostic pathway. In total, 46 interventions from 43 studies were included and 24 different logic models were generated., Conclusions: We used a novel approach to create a freely available library of logic models. The models highlight the importance of attending to what needs to occur before and after intervention delivery if the intervention is to be effective. Our work provides a useful starting point for intervention developers, helps evaluators identify intermediate outcomes, and provides a method to enable others to generate libraries for interventions targeting other errors., Competing Interests: The authors disclose no conflict of interest., (Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved.)
- Published
- 2021
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16. Outcomes, mechanisms and contextual factors of positive psychology interventions for health workers: a systematic review of global evidence.
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Kletter M, Harris B, and Brown C
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- Health Workforce, Humans, Quality Improvement, Health Personnel, Psychology, Positive
- Abstract
Background: Interventions using positive psychology (PP), which build on positive qualities of healthcare personnel and institutions, could potentially enhance organisational performance in healthcare. The aim of this systematic review was to identify if PP interventions have an impact on organisational performance of healthcare personnel, and if so, how this impact can be achieved. We developed a logic model to explain the impact of PP interventions on organisational performance., Methods: We searched Web of Science, Medline, Psychinfo, Embase, Scopus and CINAHL (from inception until March 2019) and references of included articles to identify studies that evaluated the impact of a PP intervention for health personnel. Study quality was assessed using the SQUIRE checklist for quality improvement studies. Data were extracted about study details, setting, participants, intervention, method of evaluation and results. Outcomes, mechanisms and contexts were coded in nVivo. Data synthesis was guided by Lewis' theory of the impact of PP interventions on organisational performance and Kneale et al.'s method for logic model development. Collected data were integrated into a logic model explaining initial inputs, processes, and intermediate outcomes of PP interventions that lead to improved organisational performance in healthcare settings., Results: We retrieved 4638 articles and identified five through references of included articles of which 29 studies (31 articles) met our inclusion criteria. Most articles were of low quality (n = 19) and outcome measures varied widely. We identified 54 different outcomes of PP interventions, including 'improved well-being' and 'improved interaction and support'. Forty-nine mechanisms were identified including 'recognising and reframing negative interpretations'. Twenty four contextual factors were identified of which seven acted as barriers. 'Managerial support' was a facilitator mentioned in eight studies. All identified outcomes, mechanisms and contextual factors were integrated into a logic model explaining how interventions using PP can impact organisational performance in healthcare., Conclusion: Few identified outcomes were statistically significant, however, trends in both quantitative and qualitative outcomes show that PP interventions can increase well-being and interaction and support and thus improve organisational performance in healthcare. The developed logic model can be used in the implementation and evaluation of interventions using PP for health personnel.
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- 2021
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17. [Therapeutically effective medical consultation. In basic psychosomatic management integrated specialty concepts are required].
- Author
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Kletter M
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- Adult, Curriculum, Family Practice education, Female, Humans, Psychophysiologic Disorders psychology, Somatoform Disorders psychology, Psychophysiologic Disorders therapy, Psychotherapy education, Somatoform Disorders therapy
- Published
- 1997
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