Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 285
Filtrar
1.
Musculoskelet Sci Pract ; 72: 102977, 2024 08.
Artículo en Inglés | MEDLINE | ID: mdl-38776763

RESUMEN

PURPOSE: Delegation of clinical tasks from physiotherapists to physiotherapy support workers varies considerably in musculoskeletal outpatient physiotherapy services leading to variation in patient care. This study aimed to develop consensus amongst physiotherapists, support workers and managers about what components should be included in a future framework to guide effective and safe delegation of clinical tasks to physiotherapy support workers in United Kingdom's National Health Service musculoskeletal outpatient physiotherapy services. METHODS: A consensus study was carried out, using Nominal Group Technique. Seven physiotherapists, ten physiotherapy support workers and ten physiotherapy operational/clinical leads from 13 musculoskeletal physiotherapy services within United Kingdom's National Health Service were recruited through the Chartered Society of Physiotherapy's professional networks and social media. Three separate, role-specific consensus groups were convened, involving participants generating, discussing and rating on a Likert scale, components for inclusion in a future delegation framework. RESULTS: 32 out of 38 generated items reached consensus of ≥70%, i.e. a mean of ≥4.9 on a 7-point Likert scale, across the three groups. Items were grouped under five main categories: 1) training/Continuous Professional Development for physiotherapists and support workers; 2) need for a clear delegation process; 3) competencies 4) defining the role of support workers and 5) safety net. CONCLUSION: Key stakeholder groups were able to reach consensus on five priority areas which will be developed into a best practice framework to standardise delegation and guide physiotherapists when delegating clinical tasks to support workers.


Asunto(s)
Consenso , Enfermedades Musculoesqueléticas , Fisioterapeutas , Modalidades de Fisioterapia , Humanos , Reino Unido , Fisioterapeutas/normas , Modalidades de Fisioterapia/normas , Enfermedades Musculoesqueléticas/terapia , Enfermedades Musculoesqueléticas/rehabilitación , Femenino , Masculino , Medicina Estatal , Adulto , Delegación Profesional , Atención Ambulatoria/normas
2.
Musculoskelet Sci Pract ; 69: 102905, 2024 02.
Artículo en Inglés | MEDLINE | ID: mdl-38194841

RESUMEN

BACKGROUND: The OPTimisE intervention was developed to address uncertainty regarding the most effective physiotherapy treatment strategy for people with Lateral Elbow Tendinopathy (LET). OBJECTIVES: To assess the feasibility of conducting a fully-powered randomised controlled trial (RCT) evaluating whether the OPTimisE intervention is superior to usual physiotherapy treatment for adults with LET. DESIGN: A mixed-methods multi-centred, parallel pilot and feasibility RCT, conducted in three outpatient physiotherapy departments in the UK. METHOD: Patients were independently randomised 1:1 in mixed blocks, stratified by site, to the OPTimisE intervention or usual care. Outcomes were assessed using pre-defined feasibility progression criteria. RESULTS: 50 patients were randomised (22 Female, 28 Male), mean age 48 years (range 27-75). Consent rate was 71% (50/70), fidelity to intervention 89% (16/18), attendance rate in the OPTimisE group 82% (55/67) vs 85% (56/66) in usual care, outcome measure completion 81% (39/48) at six-month follow-up. There were no related adverse events. Patients and physiotherapists reported that the OPTimisE intervention was acceptable but suggested improvements to the trial design. 49 patients were recruited from physiotherapy referrals vs one from primary care records. Outcome measure return rates were higher when completed online (74%) compared to postal questionnaire (50%). Exploratory analysis showed improvements in both groups over time. CONCLUSIONS: It is methodologically feasible to conduct a fully powered RCT comparing the clinical and cost-effectiveness of the OPTimisE intervention versus usual physiotherapy treatment. Considering the similar improvements observed in both groups, careful consideration is needed regarding the priority research question to be addressed in future research.


Asunto(s)
Tendinopatía del Codo , Enfermedades Musculoesqueléticas , Tendinopatía , Adulto , Anciano , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudios de Factibilidad , Modalidades de Fisioterapia , Encuestas y Cuestionarios , Tendinopatía/terapia , Resultado del Tratamiento , Proyectos Piloto
3.
BMC Musculoskelet Disord ; 24(1): 1, 2023 Jan 02.
Artículo en Inglés | MEDLINE | ID: mdl-36588148

RESUMEN

BACKGROUND: Clinical management of musculoskeletal shoulder pain can be challenging due to diagnostic uncertainty, variable prognosis and limited evidence for long-term treatment benefits. The UK-based PANDA-S programme (Prognostic And Diagnostic Assessment of the Shoulder) is investigating short and long-term shoulder pain outcomes. This paper reports linked qualitative research exploring patients' and clinicians' views towards primary care consultations for shoulder pain. METHODS: Semi-structured interviews were conducted with 24 patients and 15 primary care clinicians. Twenty-two interviews (11 patients, 11 clinicians) were conducted as matched patient-clinician 'dyads'. Data were analysed thematically. RESULTS: Clinicians reported attempts to involve patients in management decisions; however, there was variation in whether patients preferred treatment choice, or for decisions to be clinician-led. Some patients felt uncertain about the decisions made, due to a lack of discussion about available management options. Many General Practitioners expressed a lack of confidence in diagnosing the underlying cause of shoulder pain. Patients reported either not being given a diagnosis, or receiving different diagnoses from different professionals, resulting in confusion. Whilst clinicians reported routinely discussing prognosis of shoulder pain, patients reported that prognosis was not raised. Patients also expressed concern that their shoulder pain could be caused by serious pathology; however, clinicians felt that this was not a common concern for patients. CONCLUSIONS: Findings showed disparities between patients' and clinicians' views towards shoulder pain consultations, indicating a need for improved patient-clinician communication. Findings will inform the design of an intervention to support treatment and referral decisions for shoulder pain that will be tested in a randomised controlled trial.


Asunto(s)
Dolor Musculoesquelético , Dolor de Hombro , Humanos , Dolor de Hombro/diagnóstico , Dolor de Hombro/terapia , Hombro , Pronóstico , Investigación Cualitativa , Derivación y Consulta , Atención Primaria de Salud
4.
Eur J Sport Sci ; 23(5): 714-725, 2023 May.
Artículo en Inglés | MEDLINE | ID: mdl-35239468

RESUMEN

The aim of this systematic review with meta-analysis was to determine the effect of caffeine gum (Caff-gum) on exercise performance-related outcomes. Several databases were searched for studies assessing the effect of Caff-gum in placebo-controlled protocols involving healthy adults. Random-effects meta-analyses using standardized mean differences (SMD) were performed to determine the effect of Caff-gum on exercise outcomes with several sub-analyses (training status, exercise type, timing and dose) for potential modifying factors. 14 studies were included, totalling 200 participants. There was a significant overall effect of Caff-gum compared to placebo (SMD = 0.21, 95%CI: 0.10-0.32; p = 0.001). Subgroup analysis showed improved performance for trained (SMD = 0.23, 95%CI: 0.08-0.37; p = 0.004), but not for untrained (SMD = 0.14, 95%CI: -0.02-0.29; p = 0.07) individuals. Caff-gum improved both endurance (SMD = 0.27, 95%CI: 0.12-0.42; p = 0.002) and strength/power (SMD = 0.20, 95%CI: 0.03-0.37; p = 0.03) performance outcomes. Caff-gum was ergogenic when consumed within 15 min prior to initiating exercise (SMD = 0.27, 95%CI: 0.07-0.4; p = 0.01), but not when provided >15 min prior (SMD = -0.48, 95%CI = -1.7-0.82; p = 0.25). There was no significant effect of Caff-gum with doses <3 mg/kg body mass (BM) (SMD = 0.20, 95%CI: -0.03-0.43; p = 0.07), but there was a significant effect when the dose was ≥3 mg/kg BM (SMD = 0.22, 95%CI: 0.07-0.37; p = 0.01). Caff-gum supplementation may be an effective ergogenic strategy for trained athletes involved in both endurance and strength/power exercise, using a recommended dose of ≥3 mg/kg BM consumed within 15 min of initiating exercise.HighlightsThis study determined the effect of Caff-gum on exercise performance, using a systematic review and meta-analysis. Fourteen studies, totalling 200 participants performing a variety of endurance and strength/power exercise tests were included. The relative Caff-gum dose ranged from 1.27-4.26 mg/kg BM and timing ranged from 120 min prior to exercise up to intra-test application.Caff-gum was shown to be an effective ergogenic aid for trained individuals involved in both endurance and strength/power exercise.Supplement dose and timing modified the efficacy of Caff-gum. Supplementation with Caff-gum was effective when provided in doses ≥3 mg/kg BM and within 15 min prior to initiating exercise.Trained endurance or strength/power athletes seeking to benefit from caffeine in the form of chewing gum should supplement within 15 min prior to initiating an exercise task, in doses ≥3 mg/kg BM.


Asunto(s)
Cafeína , Sustancias para Mejorar el Rendimiento , Adulto , Humanos , Cafeína/farmacología , Goma de Mascar , Ejercicio Físico , Prueba de Esfuerzo , Sustancias para Mejorar el Rendimiento/farmacología , Suplementos Dietéticos
5.
Musculoskelet Sci Pract ; 62: 102631, 2022 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-35964497

RESUMEN

PURPOSE: There are approximately 9000 physiotherapy assistants/support workers in the UK. Many of them work in NHS physiotherapy outpatient services treating patients with musculoskeletal conditions, but their role(s) are relatively undefined and as such there is considerable variation in the duties and tasks they undertake. This study aimed to explore current practice of UK musculoskeletal physiotherapists in relation to delegation to physiotherapy assistants/support workers. METHODS: An online cross-sectional descriptive survey was designed and collected data on delegation practice and training in delegation. The survey was piloted with 10 physiotherapists. The final questionnaire was distributed via the interactive Chartered Society of Physiotherapy's website and the authors' professional networks via Twitter. Responses were collected over a five-week-period from October to November 2020. RESULTS: Of 302 survey responses, 232 were analysed (46 incomplete, 24 ineligible). The majority of respondents (66.3%, 154/232) had worked as physiotherapists for over 10 years. Most respondents indicated they had neither formal training (84%, 195/232) nor informal training (60.3%, 140/232) regarding how to delegate tasks. The clinical tasks most commonly delegated by physiotherapists were supervision of exercises (81.0%, 188/232) and walking aid provision (78.5%, 182/232) whereas the least delegated clinical task was the application of electrotherapy (19.8%, 46/232). CONCLUSION: These survey results provide evidence for the need to improve training in delegation for both physiotherapists and physiotherapy assistants, and to ensure clearer delegation processes to facilitate good delegation practice in the musculoskeletal setting.


Asunto(s)
Fisioterapeutas , Humanos , Estudios Transversales , Modalidades de Fisioterapia , Encuestas y Cuestionarios , Reino Unido
6.
Pilot Feasibility Stud ; 8(1): 178, 2022 Aug 11.
Artículo en Inglés | MEDLINE | ID: mdl-35953842

RESUMEN

BACKGROUND: Physiotherapy is recommended for people with tennis elbow, but whilst a wide array of treatments is available, the optimal approach remains uncertain. We have therefore recently developed an optimised physiotherapy treatment package for tennis elbow based on a synthesis of the evidence, patient input and clinical consensus. It consists of detailed advice and education, a structured progressive exercise programme and provision of a counter-force elbow brace. Here, we report the protocol for our multicentre pilot and feasibility randomised controlled trial (RCT) designed to (a) examine the feasibility of our optimised physiotherapy treatment package and (b) to pilot trial processes for a future fully powered RCT to test clinical and cost-effectiveness compared with usual physiotherapy treatment. METHODS: A multicentre pilot and feasibility RCT will be conducted across three sites in England, recruiting up to 50 patients (or for a maximum of 12 months). Participants with tennis elbow, identified from physiotherapy clinic waiting lists and general practice surgeries, will be randomly allocated to receive the optimised physiotherapy treatment package or usual physiotherapy care. Analysis will focus on feasibility measures including consent rate, intervention fidelity, follow-up rate and outcome completion rate. A nested qualitative study will explore the acceptability of the study processes and patient and physiotherapist experiences of the new optimised intervention. DISCUSSION: This study will determine the feasibility of a new optimised physiotherapy treatment package for people with tennis elbow and pilot the processes for a future fully powered RCT. In the longer term, this treatment package may provide superior clinical outcomes for patients, in terms of pain and quality of life, and be more cost-effective for the health service. TRIAL REGISTRATION: Registered with the ISRCTN database 19/7/2021, https://www.isrctn.com/ISRCTN64444585.

7.
Microbiol Resour Announc ; 10(42): e0088021, 2021 Oct 21.
Artículo en Inglés | MEDLINE | ID: mdl-34672711

RESUMEN

Acinetobacter pittii is widespread in the environment, and the Acinetobacter calcoaceticus-baumannii complex, to which it belongs, is a major cause of hospital-acquired pneumonia and bacteremia. A. pitti BHS4 was isolated from an air-conditioning unit in Hong Kong and its complete genome sequence (3,901,980 bp; GC content, 38.79%) established through hybrid assembly.

8.
Physiotherapy ; 112: 16-30, 2021 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-34020200

RESUMEN

BACKGROUND: Delegation by Allied Health Professionals (AHPs) to Allied Health Assistants (AHAs) was introduced in response to various challenges affecting modern health care delivery. However, the clinical and cost-effectiveness of using AHAs is relatively unexplored. OBJECTIVES: The aim of this review was to synthesise the available evidence on; firstly, the clinical and cost-effectiveness of interventions delegated by AHPs to AHAs and secondly, AHPs', AHAs' and patients' attitudes and beliefs towards delegation. DATA SOURCES: MEDLINE, AMED, CINAHL, Cochrane Library, PsycINFO, PEDro, OTseeker and Web of Science databases were searched from inception until January 2019 without restrictions. STUDY SELECTION: Primary studies investigating the clinical and cost-effectiveness of any intervention delegated by an AHP, across the spectrum of clinical areas in relation to adult patients, as well as AHPs', AHAs' and patients' attitudes and beliefs about delegation. DATA EXTRACTION & SYNTHESIS: Data were extracted by pairs of reviewers. Thematic analysis and synthesis of descriptive and analytical themes was conducted. RESULTS: Thirteen publications of variable methodological quality were included. Three studies reported quantitative research and ten qualitative research. No study explored the cost-effectiveness. Only one study investigated clinical effectiveness. Training for both AHPs and AHAs and having clear processes in place were identified as important facilitators of delegation. CONCLUSION AND IMPLICATIONS OF KEY FINDINGS: Delegation is not standardised across AHPs or within each profession. There are clear knowledge gaps regarding the clinical and cost-effectiveness of delegation by AHPs and patients' attitudes and preferences. Further research is needed to facilitate the standardisation of delegation. SYSTEMATIC REVIEW REGISTRATION NUMBER: PROSPERO CRD42019119557.


Asunto(s)
Técnicos Medios en Salud , Adulto , Análisis Costo-Beneficio , Humanos , Investigación Cualitativa
9.
Res Sports Med ; 29(6): 505-516, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33715526

RESUMEN

To compare the bicarbonate kinetics and gastrointestinal (GI) symptom responses between an equal dose of sodium bicarbonate and sodium citrate using delayed-release capsules. Thirteen active males (age 20.5 ± 2.1 y, height 1.8 ± 0.1 m and body mass [BM] 76.5 ± 9.6 kg) consumed either 0.3 g.kg-1 BM sodium bicarbonate, sodium citrate or a placebo, using a double-blind, randomized crossover design. Blood bicarbonate ion (HCO3-) concentration, pH and GI symptoms were measured pre-consumption and every 10 min for 180 min post-consumption. Blood HCO3- concentration (P < 0.001) and pH (P = 0.040) were significantly higher in the sodium bicarbonate condition compared with sodium citrate condition up to 3 h post-consumption. Peak blood HCO3- concentration was significantly higher with the sodium bicarbonate compared with citrate (P < 0.001). Mean GI symptom scores were lower (P = 0.037) for sodium citrate (1.5 ± 1.8 AU) than bicarbonate (2.6 ± 3.1 AU), with considerable inter-individual variability. No GI symptoms were reported following consumption of the placebo. Both substances increase HCO3- values significantly, with sodium bicarbonate causing significantly higher pH and HCO3- values than the same dose of sodium citrate, but results in slightly more severe GI symptoms.


Asunto(s)
Bicarbonatos/sangre , Tracto Gastrointestinal/efectos de los fármacos , Tracto Gastrointestinal/metabolismo , Bicarbonato de Sodio/administración & dosificación , Citrato de Sodio/administración & dosificación , Cápsulas , Estudios Cruzados , Preparaciones de Acción Retardada , Método Doble Ciego , Humanos , Concentración de Iones de Hidrógeno , Masculino , Adulto Joven
10.
Mucosal Immunol ; 13(6): 877-891, 2020 11.
Artículo en Inglés | MEDLINE | ID: mdl-32820248

RESUMEN

COVID-19 is causing a major once-in-a-century global pandemic. The scientific and clinical community is in a race to define and develop effective preventions and treatments. The major features of disease are described but clinical trials have been hampered by competing interests, small scale, lack of defined patient cohorts and defined readouts. What is needed now is head-to-head comparison of existing drugs, testing of safety including in the background of predisposing chronic diseases, and the development of new and targeted preventions and treatments. This is most efficiently achieved using representative animal models of primary infection including in the background of chronic disease with validation of findings in primary human cells and tissues. We explore and discuss the diverse animal, cell and tissue models that are being used and developed and collectively recapitulate many critical aspects of disease manifestation in humans to develop and test new preventions and treatments.


Asunto(s)
Anticuerpos Antivirales/biosíntesis , Antivirales/farmacología , Betacoronavirus/patogenicidad , Infecciones por Coronavirus/inmunología , Modelos Animales de Enfermedad , Neumonía Viral/inmunología , Vacunas Virales/biosíntesis , Enzima Convertidora de Angiotensina 2 , Animales , Animales Modificados Genéticamente , Antivirales/síntesis química , Betacoronavirus/efectos de los fármacos , Betacoronavirus/genética , Betacoronavirus/fisiología , COVID-19 , Vacunas contra la COVID-19 , Gatos , Quirópteros , Infecciones por Coronavirus/tratamiento farmacológico , Infecciones por Coronavirus/genética , Infecciones por Coronavirus/prevención & control , Infecciones por Coronavirus/virología , Cricetulus , Femenino , Hurones , Haplorrinos , Humanos , Masculino , Ratones , Organoides/efectos de los fármacos , Organoides/inmunología , Organoides/virología , Pandemias , Peptidil-Dipeptidasa A/genética , Peptidil-Dipeptidasa A/inmunología , Neumonía Viral/tratamiento farmacológico , Neumonía Viral/genética , Neumonía Viral/virología , SARS-CoV-2 , Índice de Severidad de la Enfermedad , Especificidad de la Especie , Glicoproteína de la Espiga del Coronavirus/genética , Glicoproteína de la Espiga del Coronavirus/inmunología , Vacunas Virales/administración & dosificación
11.
BMC Fam Pract ; 21(1): 30, 2020 02 11.
Artículo en Inglés | MEDLINE | ID: mdl-32046647

RESUMEN

BACKGROUND: Musculoskeletal (MSK) pain from the five most common presentations to primary care (back, neck, shoulder, knee or multi-site pain), where the majority of patients are managed, is a costly global health challenge. At present, first-line decision-making is based on clinical reasoning and stratified models of care have only been tested in patients with low back pain. We therefore, examined the feasibility of; a) a future definitive cluster randomised controlled trial (RCT), and b) General Practitioners (GPs) providing stratified care at the point-of-consultation for these five most common MSK pain presentations. METHODS: The design was a pragmatic pilot, two parallel-arm (stratified versus non-stratified care), cluster RCT and the setting was 8 UK GP practices (4 intervention, 4 control) with randomisation (stratified by practice size) and blinding of trial statistician and outcome data-collectors. Participants were adult consulters with MSK pain without indicators of serious pathologies, urgent medical needs, or vulnerabilities. Potential participant records were tagged and individuals sent postal invitations using a GP point-of-consultation electronic medical record (EMR) template. The intervention was supported by the EMR template housing the Keele STarT MSK Tool (to stratify into low, medium and high-risk prognostic subgroups of persistent pain and disability) and recommended matched treatment options. Feasibility outcomes included exploration of recruitment and follow-up rates, selection bias, and GP intervention fidelity. To capture recommended outcomes including pain and function, participants completed an initial questionnaire, brief monthly questionnaire (postal or SMS), and 6-month follow-up questionnaire. An anonymised EMR audit described GP decision-making. RESULTS: GPs screened 3063 patients (intervention = 1591, control = 1472), completed the EMR template with 1237 eligible patients (intervention = 513, control = 724) and 524 participants (42%) consented to data collection (intervention = 231, control = 293). Recruitment took 28 weeks (target 12 weeks) with > 90% follow-up retention (target > 75%). We detected no selection bias of concern and no harms identified. GP stratification tool fidelity failed to achieve a-priori success criteria, whilst fidelity to the matched treatments achieved "complete success". CONCLUSIONS: A future definitive cluster RCT of stratified care for MSK pain is feasible and is underway, following key amendments including a clinician-completed version of the stratification tool and refinements to recommended matched treatments. TRIAL REGISTRATION: Name of the registry: ISRCTN. TRIAL REGISTRATION NUMBER: 15366334. Date of registration: 06/04/2016.


Asunto(s)
Toma de Decisiones Clínicas , Dolor Musculoesquelético/terapia , Selección de Paciente , Atención Primaria de Salud , Adulto , Anciano , Analgésicos/uso terapéutico , Estudios de Factibilidad , Femenino , Medicina General , Humanos , Masculino , Persona de Mediana Edad , Medicamentos sin Prescripción/uso terapéutico , Clínicas de Dolor , Educación del Paciente como Asunto , Medición de Resultados Informados por el Paciente , Modalidades de Fisioterapia , Proyectos Piloto , Pronóstico , Derivación y Consulta , Reumatología , Sesgo de Selección , Automanejo , Índice de Severidad de la Enfermedad , Reino Unido
12.
Res Sports Med ; 28(1): 138-146, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-30849239

RESUMEN

This study evaluated the chronic effects of nitrate (NO3-) ingestion over three days, on 40 km TT performance in 11trained cyclists (VO2max: 60.8 ± 7.4 ml.kg-1.min-1; age: 36 ± 9 years; height: 1.80 ± 0.06 m; body mass: 87.2 ± 12.0 kg). Utilising a double-blind randomised cross-over design, participants completed three 40 km TT on a Velotron® ergometer following the ingestion of either a 140 ml of "BEET It sport®" NO3- shot containing 12.8 mmol or 800 mg of NO3-, a placebo drink or nothing (control). Performance, oxygen consumption (VO2), blood bicarbonate (HCO3-), pH and lactate (BLa) and ratings of perceived exertion (RPE) were measured every 10 km throughout the TT. The present findings show that NO3- ingestion had no effect on TT performance (NO3-: 4098.0 ± 209.8 vs. Placebo: 4161.9 ± 263.3 s, p = 0.296, ES = 0.11), or VO2 (p = 0.253, ES = 0.13). Similarly, blood lactate and RPE were also unaffected by the experimental conditions (p = 0.522, ES = 0.06; p = 0.085, ES = 0.30) respectively. Therefore, these results suggest that a high dose of NO3- over three days has limited efficacy as an ergogenic aid for 40 km TT cycling performance in trained cyclists.


Asunto(s)
Rendimiento Atlético/fisiología , Ciclismo/fisiología , Nitratos/administración & dosificación , Sustancias para Mejorar el Rendimiento/administración & dosificación , Adulto , Beta vulgaris , Estudios Cruzados , Método Doble Ciego , Humanos , Ácido Láctico/sangre , Masculino , Persona de Mediana Edad , Consumo de Oxígeno/efectos de los fármacos
15.
Sci Rep ; 8(1): 14788, 2018 10 03.
Artículo en Inglés | MEDLINE | ID: mdl-30283073

RESUMEN

Histidine containing dipeptides (HCDs) have numerous ergogenic and therapeutic properties, but their primary role in skeletal muscle remains unclear. Potential functions include pH regulation, protection against reactive oxygen/nitrogen species, or Ca2+ regulation. In recognition of the challenge of isolating physiological processes in-vivo, we employed a comparative physiology approach to investigate the primary mechanism of HCD action in skeletal muscle. We selected two avian species (i.e., hummingbirds and chickens), who represented the extremes of the physiological processes in which HCDs are likely to function. Our findings indicate that HCDs are non-essential to the development of highly oxidative and contractile muscle, given their very low content in hummingbird skeletal tissue. In contrast, their abundance in the glycolytic chicken muscle, indicate that they are important in anaerobic bioenergetics as pH regulators. This evidence provides new insights on the HCD role in skeletal muscle, which could inform widespread interventions, from health to elite performance.


Asunto(s)
Pollos/fisiología , Histidina/metabolismo , Contracción Muscular/genética , Músculo Esquelético/metabolismo , Animales , Carnosina/metabolismo , Pollos/metabolismo , Dipéptidos/metabolismo , Metabolismo Energético , Contracción Muscular/fisiología , Músculo Esquelético/fisiología , Oxígeno/metabolismo
16.
Colorectal Dis ; 20(12): 1088-1096, 2018 12.
Artículo en Inglés | MEDLINE | ID: mdl-29999580

RESUMEN

AIM: The concept of significant polyps and early colorectal cancer (SPECC) encompasses complex polyps not amenable to routine snare polypectomy or where malignancy cannot be excluded. Surgical resection (SR) offers definitive treatment, but is overtreatment for the majority which are benign and amenable to less invasive endoscopic resection (ER). The aim of this study was to investigate variations in the management and outcomes of significant colorectal polyps. METHOD: This was a retrospective observational study of significant colorectal polyps, defined as nonpedunculated lesions of ≥ 20 mm size, diagnosed across nine UK hospitals in 2014. Inclusion criteria were endoscopically or histologically benign polyps at biopsy. RESULTS: A total of 383 patients were treated by primary ER (87.2%) or SR (12.8%). Overall, 108/383 (28%) polyps were detected in the Bowel Cancer Screening Programme (BCSP). Primary SR was associated with a significantly longer length of stay and major complications (P < 0.01). Of the ER polyps, 290/334 (86.8%) patients were treated without undergoing surgery. The commonest indication for secondary surgery was unexpected polyp cancer, and of these cases 60% had no residual cancer in the specimen. Incidence of unexpected cancer was 10.7% (n = 41) and was similar between ER and SR groups (P = 0.11). On multivariate analysis, a polyp size of > 30 mm and non-BCSP status were independent risk factors for primary SR [OR 2.51 (95% CI 1.08-5.82), P = 0.03]. CONCLUSION: ER is safe and feasible for treating significant colorectal polyps. Robust accreditation within the BCSP has led to improvements in management, with lower rates of SR compared with non-BCSP patients. Standardization, training in polyp assessment and treatment within a multidisciplinary team may help to select appropriate treatment strategies and improve outcomes.


Asunto(s)
Pólipos del Colon/cirugía , Colonoscopía/métodos , Neoplasias Colorrectales/prevención & control , Detección Precoz del Cáncer/métodos , Anciano , Pólipos del Colon/complicaciones , Neoplasias Colorrectales/diagnóstico , Neoplasias Colorrectales/etiología , Estudios de Factibilidad , Femenino , Humanos , Tiempo de Internación , Masculino , Uso Excesivo de los Servicios de Salud/prevención & control , Persona de Mediana Edad , Estudios Retrospectivos , Factores de Riesgo , Reino Unido
17.
Proc Math Phys Eng Sci ; 474(2220): 20180295, 2018 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-30602927

RESUMEN

This paper presents a computational framework to study the differences in process-induced microvoid and precipitate distributions during selective laser melting (SLM) of two nickel-based superalloys representative of low (IN718) and high (CM247LC) volume fraction precipitate-strengthened alloys. Simulations indicate that CM247LC has a higher propensity to form process-induced microvoids than IN718. Particle sintering is predicted to be strongly influenced by the powder size distribution. For deposition thickness of approximately 40 µm, thermal gradients during cooling are predicted to be larger for CM247LC than IN718 and consequently expect the development of larger residual stresses for a high volume fraction γ' alloy. A coupled mean field/finite-element approach has been used to predict the precipitate distributions across a simple rectangular build and during a subsequent hot isostatic pressing (HIP) cycle. Unimodal and multi-modal particle distributions are predicted for IN718 and CM247LC at the end of the SLM, respectively. A higher volume fraction of γ' is predicted for CM247LC at the end of the SLM process. During HIP, simulations indicate a dramatic increase in the γ' volume fraction in CM247LC, which can result in a reduction in stress relaxation and lead to a ductility drop.

19.
Polym Chem ; 8(38): 5962-5971, 2017 Oct 14.
Artículo en Inglés | MEDLINE | ID: mdl-29308095

RESUMEN

The recent development of polymerization-induced self-assembly (PISA) has facilitated the rational synthesis of a range of diblock copolymer worms, which hitherto could only be prepared via traditional post-polymerization processing in dilute solution. Herein we explore a new synthetic route to aqueous dispersions of cationic disulfide-functionalized worm gels. This is achieved via the PISA synthesis of poly[(glycerol monomethacrylate-stat-glycidyl methacrylate)]-block-poly(2-hydroxypropyl methacrylate) (P(GMA-stat-GlyMA)-PHPMA) block copolymer worms via reversible addition-fragmentation chain transfer (RAFT) aqueous dispersion polymerization of HPMA. A water-soluble reagent, cystamine, is then reacted with the pendent epoxy groups located within the P(GMA-stat-GlyMA) stabilizer chains to introduce disulfide functionality, while simultaneously conferring cationic character via formation of secondary amine groups. Moreover, systematic variation of the cystamine/epoxy molar ratio enables either chemically cross-linked worm gels or physical (linear) primary amine-functionalized disulfide-based worm gels to be obtained. These new worm gels were characterized using gel permeation chromatography, 1H NMR spectroscopy, transmission electron microscopy, dynamic light scattering, aqueous electrophoresis and rheology. In principle, such hydrogels may offer enhanced mucoadhesive properties.

20.
Colorectal Dis ; 19(1): 67-75, 2017 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-27610599

RESUMEN

AIM: The management of large non-pedunculated colorectal polyps (LNPCPs) is complex, with widespread variation in management and outcome, even amongst experienced clinicians. Variations in the assessment and decision-making processes are likely to be a major factor in this variability. The creation of a standardized minimum dataset to aid decision-making may therefore result in improved clinical management. METHOD: An official working group of 13 multidisciplinary specialists was appointed by the Association of Coloproctology of Great Britain and Ireland (ACPGBI) and the British Society of Gastroenterology (BSG) to develop a minimum dataset on LNPCPs. The literature review used to structure the ACPGBI/BSG guidelines for the management of LNPCPs was used by a steering subcommittee to identify various parameters pertaining to the decision-making processes in the assessment and management of LNPCPs. A modified Delphi consensus process was then used for voting on proposed parameters over multiple voting rounds with at least 80% agreement defined as consensus. The minimum dataset was used in a pilot process to ensure rigidity and usability. RESULTS: A 23-parameter minimum dataset with parameters relating to patient and lesion factors, including six parameters relating to image retrieval, was formulated over four rounds of voting with two pilot processes to test rigidity and usability. CONCLUSION: This paper describes the development of the first reported evidence-based and expert consensus minimum dataset for the management of LNPCPs. It is anticipated that this dataset will allow comprehensive and standardized lesion assessment to improve decision-making in the assessment and management of LNPCPs.


Asunto(s)
Toma de Decisiones Clínicas/métodos , Pólipos del Colon , Cirugía Colorrectal/normas , Consenso , Gastroenterología/normas , Humanos , Irlanda , Sociedades Médicas , Reino Unido
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA