Biomedical subjects

G R Barton

Publications and source records attributed to G R Barton.

5 recordsLinked to original sources

PubMed2006

The relationship between body mass index and health-related quality of life: comparing the EQ-5D, EuroQol VAS and SF-6D.

BACKGROUND: No other studies have compared the relationship between body mass index (BMI) and health-related quality of life (HRQL) on more than one utility measure. Estimating the HRQL effects of obesity on a (common) utility scale enables the relative cost-effectiveness of interventions designed to alleviate obesity to be estimated. OBJECTIVE: To examine the relationship between BMI and HRQL according to the EQ-5D, EuroQol visual analogue scale (EQ-VAS) and SF-6D. METHODS: Patients aged >/=45 years at one UK general practice were asked to complete the EQ-5D, EQ-VAS, SF-36 questionnaire (used to derive the SF-6D), and information on their characteristics and co-morbidity. Body mass index was categorized according to the World Health Organization (WHO) recommendations. Regression analysis was used to compare the HRQL of normal BMI patients to the HRQL of patients in other BMI categories, while controlling for patient characteristics and co-morbidity. RESULTS: A total of 1865 patients responded (67%), mean BMI 26.0 kg/m(2), 16% obese (BMI>/=30). Patients with back pain, hip pain, knee pain, asthma, diabetes or osteoarthritis were also significantly more likely to be obese. After controlling for other factors, compared to normal BMI patients, obese patients had a lower HRQL according to the EQ-5D (P<0.01), EQ-VAS (P<0.001) and SF-6D (P<0.001). Pre-obese patients were not estimated to have a significantly lower HRQL, and underweight patients were only estimated to have a significantly lower HRQL according to the SF-6D. These results arose because, on the EQ-5D, obese patients were found to have significantly more problems with mobility and pain, compared to physical functioning, social functioning and role limitations on the SF-6D. Whereas, according to the SF-6D, underweight patients had significantly more problems on the dimension of role limitation. CONCLUSION: The EQ-5D, EQ-VAS and SF-6D were in agreement that, relative to a normal BMI, obesity is associated with a lower HRQL, even after controlling for patient characteristics and co-morbidity. These three measures are thereby sensitive to the HRQL effects of obesity and can be used to estimate the cost-effectiveness of interventions designed to alleviate obesity.

Age Distribution↗

PubMed2006

Self-reported benefits from successive bilateral cochlear implantation in post-lingually deafened adults: randomised controlled trial.

Adult users of unilateral Nucleus CI24 cochlear implants with the SPEAK processing strategy were randomised either to receive a second identical implant in the contralateral ear immediately, or to wait 12 months while they acted as controls for late-emerging benefits of the first implant. Twenty four subjects, twelve from each group, completed the study. Receipt of a second implant led to improvements in self-reported abilities in spatial hearing, quality of hearing, and hearing for speech, but to generally non-significant changes in measures of quality of life. Multivariate analyses showed that positive changes in quality of life were associated with improvements in hearing, but were offset by negative changes associated with worsening tinnitus. Even in a best-case scenario, in which no worsening of tinnitus was assumed to occur, the gain in quality of life was too small to achieve an acceptable cost-effectiveness ratio. The most promising strategies for improving the cost-effectiveness of bilateral implantation are to increase effectiveness through enhanced signal processing in binaural processors, and to reduce the cost of implant hardware.

Adult↗

PubMed2004

Incidence of meningitis and of death from all causes among users of cochlear implants in the United Kingdom.

BACKGROUND: During 2002, there was an increase in reports of bacterial meningitis among people with cochlear implants in Europe and North America. One model of implant, which included a space-occupying 'positioner', was recalled. Implantation of a positioner was shown to be a risk factor for meningitis among children in the United States. The situation in the United Kingdom was not known. METHODS: We ascertained the cohort of people who had received cochlear implants with intra-cochlear electrodes in UK hospitals prior to 1 October 2002 and were permanently resident in the United Kingdom. We compared the incidence of meningitis, and the causes and incidence of death from all causes, between the cohort and reference populations. RESULTS: Of 1851 children (66 with positioners), none had contracted meningitis. Neither the incidence rate of meningitis, nor the cumulative mortality from all causes, differed significantly between implanted children and values expected for the general population. Of 1779 adults (139 with positioners), five had contracted meningitis with three fatalities. No case of meningitis involved a positioner and four of the cases, including the fatalities, possessed risk factors unrelated to implantation. Although the incidence rate of meningitis was significantly higher in implanted adults than the general population, cumulative mortality from all causes was never higher, and was significantly lower at some time points after implantation. CONCLUSION: Specific evidence of the association between bacterial meningitis and implantation with a positioner that arose in the United States and mainland Europe during 2002 has not been found in the United Kingdom.

Adolescent↗

PubMed1999

Interventions to improve uptake of breast screening in inner city Cardiff general practices with ethnic minority lists.

OBJECTIVE: To increase the uptake of breast screening in three inner city GP practices with a high proportion of ethnic minority patients. SETTING: The study was carried out in May and June 1997 in the South East Wales division of Breast Test Wales (BTW). Three inner city general practices in Cardiff, with a low uptake in the previous round of breast screening and a high proportion of ethnic minority women on their lists, were targeted to receive interventions to increase uptake. This preliminary study was not randomized but sought to offer insights into the interventions which may be worth pursuing and the groups that are harder to reach. DESIGN INTERVENTIONS: identification of ethnic language groups; GP endorsement letter; translated literature including: multilingual leaflet, GP letter, screening invitation; transport to the screening centre; language support. RESULTS: Of 369 women invited, 187 attended for screening. This gives an uptake of 50.7% compared with an uptake of 35.2% in the previous screening round, a statistically significant increase of 15.5%. (95% CI +8.2% to +22.5%). CONCLUSION: Findings show that translated literature, GP endorsement letter and language support by linkworkers were beneficial. The provision of free transport was ineffective and under-utilized. Uptake was highest amongst Urdu and Gujarati speaking groups and lowest for Bengali and Somali speakers which are hardest to reach. There is scope for improving the attendance rate amongst ethnic minority groups but this can costly.

Breast Neoplasms↗

PubMed1993

New Zealand general practitioner referral patterns.

AIM: The aim of this study was to describe the referral patterns of general practitioners in New Zealand, for a defined list of medical conditions. METHODS: A postal questionnaire was sent to a random sample of 200 general practitioners, selected from the Medical Council of New Zealand list. Responses were made on five point scales to indicate general practitioners' views on the appropriateness of referral. For each medical condition, derived from An Educational Guide for General Practice, respondents also indicated favoured agencies for referral. Cluster analysis was used on an SPSSX dataset. RESULTS: A response rate of 87% (91.5% of eligible contacts) was achieved. The conditions for which referrals were least often made included mild hypertension, rheumatoid arthritis not requiring second line therapy, hypothyroidism, and obesity. Referral was common for rheumatoid arthritis requiring second line therapy, insulin dependent diabetes mellitus, altered bowel habit with rectal bleeding, multiple sclerosis, and postmenopausal bleeding. Seventy seven different referral agencies were indicated by respondents: the most common was the general physician (13% of all agencies indicated). CONCLUSIONS: Although there are a large number of conditions which are routinely managed only in general practice, general practitioners need to be able to refer patients to other health carers, even if only occasionally. There is a high degree of consensus as to the conditions for which referral is usually appropriate. They tend to be conditions requiring well defined investigation, treatment or management procedures which are commonly provided by centralised secondary or tertiary institutions.

Attitude of Health Personnel↗