15 results on '"Peter Barnes"'
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2. Radiation exposure from radiological procedures in liver transplant candidates with hepatocellular carcinoma
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Numan Kutaiba, Joshua G Varcoe, Peter Barnes, Natalie Succar, Eddie Lau, Kurvi Patwala, Elizabeth Low, Zaid Ardalan, Paul Gow, and Mark Goodwin
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Adult ,Male ,Carcinoma, Hepatocellular ,Liver Neoplasms ,Humans ,Female ,Radiology, Nuclear Medicine and imaging ,General Medicine ,Middle Aged ,Radiation Exposure ,Radiation Dosage ,Liver Transplantation ,Retrospective Studies - Abstract
Candidates for liver transplantation (LT) with hepatocellular carcinoma (HCC) undergo a large number of diagnostic and interventional radiology procedures. A significant proportion of such procedures involve ionizing radiation with increased lifetime risk of cancer. The objective of our study was to review LT candidates with HCC to quantify ionizing radiation doses from different radiology procedures performed at a single transplant center.We retrospectively reviewed 179 adult patients with HCC (median age 58.6 years [IQR, 55-62]; 155 [86.6%] males) who were accepted for LT between April 2010 and Dec 2018. Radiology procedures and radiation doses were retrieved and the total and median radiation effective dose in millisieverts (mSv) were calculated for different procedures. Exposure to ionizing radiation was categorized based on previously reported thresholds.We assessed 9,986 radiology procedures for our cohort. Patients had a median effective dose prior to transplantation of 254 mSv (IQR, 130-421) with an annualized rate of 152 mSv (IQR, 92-266). Patient median dose increased to 316 mSv (IQR, 159-478) when including exposures post-LT within the study period. 85% of overall exposure was in the extremely high exposure category (100 mSv). Interventional procedures represented 13% of procedures with substantial radiation and contributed to 45% of radiation exposure while abdominal CTs represented 39% of total procedures and contributed to 45% of radiation exposure.Patients with HCC considered for LT undergo radiology procedures with significant cumulative radiation exposure. Attempts to reduce radiation exposure are suggested by minimizing unnecessary procedures and utilizing ones without ionizing radiation. Improving interventional techniques to reduce radiation doses is needed without compromising treatment delivery.
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- 2023
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3. Asthma mechanisms
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Peter Barnes
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0301 basic medicine ,03 medical and health sciences ,030104 developmental biology ,0302 clinical medicine ,030228 respiratory system ,General Medicine - Published
- 2016
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4. Does frequent residential mobility in early years affect the uptake and timeliness of routine immunisations? An anonymised cohort study
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Hayley A Hutchings, Peter Barnes, Sarah Rodgers, Michelle James-Ellison, Alison Maddocks, Melanie A. Healy, Shantini Paranjothy, Frank David John Dunstan, Ronan A Lyons, and Annette Evans
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Pediatrics ,medicine.medical_specialty ,RJ101 ,Population Dynamics ,Immunization, Secondary ,Meningococcal Vaccines ,Meningococcal vaccine ,Article ,Cohort Studies ,Pneumococcal Vaccines ,03 medical and health sciences ,0302 clinical medicine ,030225 pediatrics ,Immunology and Microbiology(all) ,medicine ,Humans ,030212 general & internal medicine ,Children ,Immunization Schedule ,Wales ,Booster (rocketry) ,General Veterinary ,General Immunology and Microbiology ,Immunization Programs ,business.industry ,Vaccination ,Cohort ,Public Health, Environmental and Occupational Health ,Infant ,Odds ratio ,medicine.disease ,veterinary(all) ,Confidence interval ,3. Good health ,Infectious Diseases ,Child, Preschool ,Molecular Medicine ,business ,Meningitis ,Residential mobility ,Immunisation status ,Measles-Mumps-Rubella Vaccine ,Cohort study - Abstract
Background: There are conflicting findings regarding the impact of residential mobility on immunisationstatus. Our aim was to determine whether there was any association between residential mobility andtake up of immunisations and whether they were delayed in administration.\ud \ud Methods: We carried out a cohort analysis of children born in Wales, UK. Uptake and time of immunisationwere collected electronically. We defined frequent movers as those who had moved: 2 or more times inthe period prior to the final scheduled on-time date (4 months) for 5 in 1 vaccinations; and 3 or moretimes in the period prior to the final scheduled on-time date (12 months) for MMR, pneumococcal andmeningitis C vaccinations. We defined immunisations due at 2–4 months delayed if they had not beengiven by age 1; and those due at 12–13 months as delayed if they had not been given by age 2.\ud \ud Results: Uptake rates of routine immunisations and whether they were given within the specified time-frame were high for both groups. There was no increased risk (odds ratios (95% confidence intervals)between frequent movers compared to non-movers for the uptake of: primary MMR 1.08 (0.88–1.32);booster Meningitis C 1.65 (0.93–2.92); booster pneumococcal 1.60 (0.59–4.31); primary 5 in 1 1.28(0.92–1.78); and timeliness: primary MMR 0.92 (0.79–1.07); booster Meningitis C 1.26 (0.77–2.07);booster pneumococcal 1.69 (0.23–12.14); and primary 5 in 1 1.04 (0.88–1.23).\ud \ud Discussion: Findings suggest that children who move home frequently are not adversely affected in termsof the uptake of immunisations and whether they were given within a specified timeframe. Both werehigh and may reflect proactive behaviour in the primary healthcare setting to meet Government coveragerates for immunisation.
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- 2016
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5. Application of robust Generalised Cross-Validation to the inverse problem of electrocardiology
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Josef Peter Barnes and Peter Rex Johnston
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Mathematical optimization ,0206 medical engineering ,Models, Cardiovascular ,Signal Processing, Computer-Assisted ,Health Informatics ,02 engineering and technology ,White noise ,030204 cardiovascular system & hematology ,Standard methods ,Inverse problem ,020601 biomedical engineering ,Cross-validation ,Computer Science Applications ,Tikhonov regularization ,Electrocardiography ,03 medical and health sciences ,0302 clinical medicine ,Robustness (computer science) ,Heart beat ,Humans ,Applied mathematics ,Mathematics - Abstract
Robust Generalised Cross-Validation was proposed recently as a method for determining near optimal regularisation parameters in inverse problems. It was introduced to overcome a problem with the regular Generalised Cross-Validation method in which the function that is minimised to obtain the regularisation parameter often has a broad, flat minimum, resulting in a poor estimate for the parameter. The robust method defines a new function to be minimised which has a narrower minimum, but at the expense of introducing a new parameter called the robustness parameter.In this study, the Robust Generalised Cross-Validation method is applied to the inverse problem of electrocardiology. It is demonstrated that, for realistic situations, the robustness parameter can be set to zero. With this choice of robustness parameter, it is shown that the robust method is able to obtain estimates of the regularisation parameter in the inverse problem of electrocardiology that are comparable to, or better than, many of the standard methods that are applied to this inverse problem. HighlightsRobust Generalised Cross-Validation (RGCV) is introduced to ECG Imaging.RGCV is compared to more common methods for two heart beat scenarios.Zero order Tikhonov regularisation is the basis for the comparison.Various levels of white noise and geometric noise are considered.RGCV produces accurate and consistent epicardial potential distributions.
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- 2016
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6. Disadvantage and economic viability: characterising vulnerabilities and resilience in upland farming systems
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Joana Ferreira, Andrew Peter Barnes, and SG Thomson
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Natural resource economics ,business.industry ,media_common.quotation_subject ,Geography, Planning and Development ,0211 other engineering and technologies ,Leasehold estate ,021107 urban & regional planning ,Forestry ,02 engineering and technology ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,Public good ,Payment ,01 natural sciences ,Agriculture ,Succession planning ,Psychological resilience ,business ,Common Agricultural Policy ,Disadvantage ,0105 earth and related environmental sciences ,Nature and Landscape Conservation ,media_common - Abstract
Less Favoured Areas (LFA) were designated to support farming activity on land with limited productive potential. However, progressive land abandonment in these areas questions the rationale and targeting of support payments to maintain viable farming enterprises. Using micro level data on farm businesses over the period 2003-2016 matched to land capability and spatial data we identify the distribution of viable and vulnerable enterprises in Less Favoured Areas. We find five categories of household based on progressive quality of life thresholds, namely i. vulnerable, ii. sustainable, iii. viable, iv. resilient, and v. robust. A proportional odds model measured the effect of biophysical and remote disadvantage on predicting these states of viability, along with farm family lifecycle factors. Whilst we would expect higher proportions of disadvantaged farmland to be negatively related to viability, when combined with rural remoteness this increases the magnitude of the effect. However, clear succession planning and tenancy arrangements suggest that approaches to management of the business and the farm family life-cycle may overcome some of these disadvantages. These results have to be considered against the UK’s planned withdrawal from the Common Agricultural Policy. This offers opportunities to provide a more nuanced approach to targeting and supporting disadvantaged regions beyond current criteria. However, there would seem to be dissonance between the proposed payment for public goods agenda, which is results orientated, and support for correcting natural disadvantages where opportunities for delivery of these public goods will be limited.
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- 2020
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7. Date-label use and the waste of dairy products by consumers
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Bethan Thompson, Andrew Peter Barnes, Luiza Toma, and Cesar Revoredo-Giha
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Upstream (petroleum industry) ,Renewable Energy, Sustainability and the Environment ,020209 energy ,Strategy and Management ,media_common.quotation_subject ,05 social sciences ,Control (management) ,Theory of planned behavior ,02 engineering and technology ,Building and Construction ,Industrial and Manufacturing Engineering ,Food waste ,050501 criminology ,0202 electrical engineering, electronic engineering, information engineering ,Habit ,Business ,Marketing ,Consumer behaviour ,0505 law ,General Environmental Science ,media_common - Abstract
This study contributes to the household food waste literature by helping us to understand the personal and social factors that influence our use of expiry-date labels on dairy products. It uses an extended theory of planned behaviour (TPB) model with the additional variables of habit and food waste attitudes as well as two upstream expiry-date behaviours, checking date labels in shops and checking date labels in the fridge. Data was collected from consumers in a two-stage survey. Results indicate that both intentions and habit had a relatively strong influence on behaviour, as did the upstream expiry-date behaviours of checking date labels in shops and checking date labels in the fridge. Attitudes, food waste attitudes, and social norms were all found to be associated with intentions whereas perceived behavioural control (PBC) was not found to be associated with either intentions of behaviour. These findings have implications for our understanding of behaviours associated with food waste and therefore for food waste reduction policy and communication efforts.
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- 2020
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8. Failure to thrive
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Surekha Tuohy, Stephen Allen, and Peter Barnes
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medicine.medical_specialty ,Pediatrics ,Health professionals ,business.industry ,Growth faltering ,medicine.disease ,Slow growth ,Malnutrition ,Multidisciplinary approach ,Pediatrics, Perinatology and Child Health ,Failure to thrive ,Normal children ,medicine ,Routine clinical practice ,medicine.symptom ,Intensive care medicine ,business - Abstract
Despite being commonly used, the term failure to thrive (FTT) has no consistent definition. In its broadest sense, FTT refers to poor growth in infants and young children. Although FTT defies attempts at a strict definition and its effect on future growth and development remains unclear, the assessment of growth remains a central part of routine clinical practice and health professionals are frequently required to assess a child who is thought to be growing poorly. This review describes the comprehensive and multidisciplinary clinical assessment that is required to identify specific underlying causes including illnesses and adverse social and other environmental factors. Most children with suspected FTT will be normal children who are constitutionally small or have slow growth and only reassurance is required. For those with underlying causes, careful clinical assessment informs appropriate management, which usually requires multidisciplinary input.
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- 2008
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9. Reply
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Peter Barnes, Ian Adcock, and Mohamed Shamji
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Text mining ,Biochemistry ,business.industry ,Immunology ,Amine oxidase (copper-containing) ,Immunology and Allergy ,Medicine ,business - Published
- 2015
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10. Introduction
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Peter Barnes
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- 2004
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11. Development and use of a privacy-protecting total population record linkage system to support observational, interventional, and policy relevant research
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Peter Barnes, Alison Maddocks, Kerina H. Jones, Hayley A Hutchings, Melanie A. Hyatt, Annette Evans, Frank David John Dunstan, Joanne Demmler, David V. Ford, Michelle James-Ellison, Mark James Kelly, Sarah Lowe, William John Watkins, Gareth John, Shantini Paranjothy, Sinead Brophy, David Lawrence Fone, Belinda J. Gabbe, Ronan A Lyons, Caroline J. Brooks, and Sarah Rodgers
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Government ,medicine.medical_specialty ,education.field_of_study ,business.industry ,Population ,General Medicine ,Educational attainment ,language.human_language ,Social research ,Unit (housing) ,Welsh ,Family medicine ,medicine ,language ,Observational study ,business ,education ,Record linkage - Abstract
Background The 2006 Cooksey review of UK health research identified the NHS cradle-to-grave records of the 60 million UK residents as having the greatest potential to reinvigorate the UK research environment. Subsequently, national and regional e-health research units were set up across the UK, including in Wales, the Secure Anonymised Information Linkage (SAIL) system. We aim to draw attention to the uses, findings, and research potential of the SAIL system. Methods The SAIL system is a suite of privacy-protecting technologies, including multistage encryption in which unique anonymised numbers replace individual, household, and organisational identities (appendix). There is strong input from patient and public representatives and an independent panel that scrutinised proposals. Many different health, educational attainment, and housing datasets are included in SAIL, which now supports various research designs including pure population-based electronic cohorts, traditional cohorts, embedded individual and cluster randomised trials, and assessments of natural experiments. Examples from more than 50 studies supported so far include the Wales Electronic Cohort for Children (WECC), NIHR-funded evaluations of natural experiments (housing improvement and changes in alcohol outlet density), cluster randomised trials of prehospital care, and an assessment of the Welsh Government Flying Start childhood initiative. We will focus on some of the results from WECC. Findings WECC contains anonymised records of the 804 290 children living in Wales between 1990 and 2008 compiled from nine datasets (linkage rate >97% for three population registers: births, NHS registrations, and community child dataset). 590 042 children were born in Wales, and electronic education records were available for 122 817 born after 1994. This analysis will focus on the effect of pregnancy, birth, and childhood factors on health status and educational attainment to key stage 1 (age 7 years). For example, very low birthweight (hazard ratio [HR] 2·4, 95% CI 1·9–2·9), prematurity (3·07, 2·76–3·41, for Interpretation The SAIL system provides a research efficient e-cohort platform on which it is possible to embed intervention trials and assess the effect of natural experiments and multisectoral policy initiatives on health, educational, and other population outcomes. Funding The Health Information Research Unit at Swansea University receives funding for operation of SAIL from the National Institute of Social Care and Health Research. Two multifinder initiatives, DECIPHer and CIPHER, contributed to studies included in the abstract. Additional funders were Arthritis Research UK, the British Heart Foundation, Cancer Research UK, the Chief Scientist Office (Scottish Government), the Economic and Social Research Council, the Engineering and Physical Sciences Research Council, the Medical Research Council, NIHR, and the Wellcome Trust.
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- 2012
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12. Reply
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Peter Barnes and Sergei Kharitonov
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Pediatrics, Perinatology and Child Health - Published
- 2000
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13. Response
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Peter Barnes and Ian Adcock
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Pulmonary and Respiratory Medicine ,Cardiology and Cardiovascular Medicine ,Critical Care and Intensive Care Medicine - Published
- 2009
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14. Autonomic control of airway function in asthma
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Peter Barnes
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Pulmonary and Respiratory Medicine ,Cardiology and Cardiovascular Medicine ,Critical Care and Intensive Care Medicine - Published
- 1987
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15. CUSHING'S DISEASE: SUCCESSFUL TREATMENT WITH CYPROHEPTADINE
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Eric Ross, Peter Barnes, and K.M. Shaw
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Pediatrics ,medicine.medical_specialty ,business.industry ,medicine ,General Medicine ,Cushing's disease ,Cyproheptadine ,business ,medicine.disease ,medicine.drug - Published
- 1977
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