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Biomedical subjects

R S Taylor

Publications and source records attributed to R S Taylor.

At least 37 records · Page 2Linked to original sources

Provision, uptake and cost of cardiac rehabilitation programmes: improving services to under-represented groups.

OBJECTIVES: To estimate UK need for outpatient cardiac rehabilitation, current provision and identification of patient groups not receiving services. To conduct a systematic review of literature on methods to improve uptake and adherence to cardiac rehabilitation. To estimate cost implications of increasing uptake of cardiac rehabilitation. DATA SOURCES: Hospital Episode Statistics (England). Hospital Inpatient Systems (Northern Ireland). Patients Episode Database for Wales. British Association for Cardiac Rehabilitation/British Heart Foundation surveys. Cardiac rehabilitation centres. Patients from general hospitals. Electronic databases. REVIEW METHODS: The study analysed hospital discharge statistics to ascertain the population need for outpatient cardiac rehabilitation in the UK. Surveys of cardiac rehabilitation programmes were conducted to determine UK provision, uptake and audit activity, and to identify local interventions to improve uptake. Data were also examined from a trial estimating eligibility for cardiac rehabilitation and non-attendance. A systematic review of interventions to improve patient uptake, adherence and professional compliance in cardiac rehabilitation was conducted. Estimated costs of improving uptake were identified from national survey, systematic review and sampled cardiac rehabilitation programmes. RESULTS: In England, Wales and Northern Ireland nearly 146,000 patients discharged from hospital with primary diagnosis of acute myocardial infarction, unstable angina or following revascularisation were potentially eligible for cardiac rehabilitation. In England in 2000, 45-67% of these patients were referred, with 27-41% attending outpatient cardiac rehabilitation. If all discharge diagnoses of ischaemic heart disease were considered, nearly 299,000 patients would be potentially eligible and in England rates of attendance and referral would be 22-33% and 13-20% respectively. Rates of referral and attendance were similar in Wales, but somewhat lower in Northern Ireland. It was found that referral and attendance of older people and women at cardiac rehabilitation tended to be low. It was also suggested that patients from ethnic minorities and those with angina or heart failure were less likely to be referred to or join programmes. A wide range of local interventions suggested awareness of the problem of uptake. In an NHS-funded randomised controlled trial, possibly representing more optimal protocol-led care, medical and nursing staff identified 73-81% of patients with acute myocardial infarction as eligible for cardiac rehabilitation. Excluded patients tended to be older with more severe presentation of cardiac disease. Experiences of patients suggested that uptake may be improved by addressing issues of motivation and relevance of rehabilitation to future well-being, co-morbidities, site and time of programme, transport and care for dependents. Systematic review of studies supported the use of letters, pamphlets or home visits to motivate patients and the use of trained lay visitors. Self-management techniques showed some value in promoting adherence to lifestyle changes. Studies examining professional compliance found that professional support for practice nurses may have value in the coordination of postdischarge care. Average costs in 2001 of cardiac rehabilitation to the health service per patient completing a cardiac rehabilitation programme were about GBP350 (staff only) and GBP490 (total). If services were modelled on an intermediate multidisciplinary configuration with three to five key staff, approximately 13% more patients could be treated with the same budget. Depending on staffing configuration an approximate 200-790% budget increase would be required to provide cardiac rehabilitation to all potentially eligible patients. CONCLUSIONS: Provision of outpatient cardiac rehabilitation in the UK is low and little is known about the capacity of cardiac rehabilitation centres to increase this provision. There is an uncoordinated approach to audit data collection and few interventions aimed at improving the situation have been formally evaluated. Motivational communications and trained lay volunteers may improve uptake of cardiac rehabilitation, as may self-management techniques. Experience of low-cost interventions and good practice exists within rehabilitation centres, although cost information frequently is not reported. Increased provision of outpatient cardiac rehabilitation will require extra resources. Further trials are required to compare the cost-effectiveness of comprehensive multidisciplinary rehabilitation with simpler outpatient programmes, also research is needed into economic and patient preference studies of the effects of different methods of using increased funding for cardiac rehabilitation. An evaluation of a range of interventions to promote attendance in all patients and under-represented groups would also be useful. The development of standards is suggested for audit methods and for eligibility criteria, as well as regular and comprehensive data collection to estimate the need for and provision of cardiac rehabilitation. Further areas for intervention could be identified through qualitative studies, and the extension of low-cost interventions and good practice within rehabilitation centres. Regularly updated systematic reviews of relevant literature would also be useful.

Cost-Benefit Analysis↗

The effectiveness of routine dental checks: a systematic review of the evidence base.

AIMS: To systematically review the effectiveness of routine dental checks of different recall frequencies in adults and children. METHODS: Search methods included electronic bibliographic databases up to March 2001, relevant internet sites, citation checking and contact with experts and professional dental bodies. INCLUSION CRITERIA: (1) STUDY DESIGN: any; (2) POPULATION: deciduous, mixed and permanent dentition; (3) INTERVENTION: 'Routine dental check': 'clinical examination, advice, charting (including monitoring of periodontal status) and report' as defined in the NHS Executive General Dental Service Statement of Dental Remuneration; (4) Comparator: no routine dental check or routine dental check(s) of different recall frequency; (5) PRIMARY OUTCOMES: caries, periodontal disease, quality of life, oral cancer. RESULTS: Twenty eight studies were identified for the review. Studies were poorly reported and clinically heterogenous which restricted comparison between studies and limited generalisability to the UK situation. There was no consistency across multiple studies in the direction of effect of different dental check frequencies on measures of caries in deciduous mixed or permanent dentition, periodontal disease or oral cancer in permanent dentition. No studies were identified linking empirical measures of quality of life associated with oral health and dental check frequency. CONCLUSIONS: There is no existing high quality evidence to support or refute the practice of encouraging six-monthly dental checks in adults and children.

Adult↗

Femtosecond laser fabrication of nanostructures in silica glass.

A femtosecond laser beam focused inside fused silica and other glasses can modify the refractive index of the glass. Chemical etching and atomic-force microscope studies show that the modified region can have a sharp-tipped cone-shaped structure with a tip diameter as small as 100 nm. Placing the structure near the bottom surface of a silica glass sample and applying a selective chemical etch to the bottom surface produces clean, circular, submicrometer-diameter holes. Holes spaced as close to one another as 1.4 microm are demonstrated.

Journal Article↗

Near-field scanning optical microscopy probes: a comparison of pulled and double-etched bent NSOM probes for fluorescence imaging of biological samples.

Bent near-field optical probes for biological applications have been fabricated using a combination of a two-step chemical etching method and focused ion beam milling to create a well-defined aperture. The transmission efficiencies have been evaluated as a function of laser wavelength (lambda) and aperture size (D) for both large and small core fibres. The probe transmission behaviour follows a (D/lambda)3 relationship. The double-etched probes are compared to pulled probes fabricated from highly GeO2-doped dispersion compensating fibre and a standard single-mode optical fibre. The transmission efficiencies of both types of pulled probes are approximately two orders of magnitude lower than double-etched probes with similar aperture sizes. To demonstrate the utility of the various probes, their imaging performance has been evaluated for samples of polymer beads and phase-separated phospholipid monolayers of dipalmitoylphosphatidylcholine or cholesterol/phosphatidylcholine/sphingomyelin mixtures. Both pulled and double-etched probes are suitable for fluorescence imaging of polymer spheres. However, pulled probes are rapidly damaged at the higher input laser intensities required for fluorescence imaging of monolayer samples doped with < 1% of a fluorescent dye-labelled lipid. The images obtained with the double-etched probes show excellent spatial resolution and signal/noise, illustrating the potential of such probes for imaging of biological samples.

Microscopy, Atomic Force↗

Maternal ante-natal parameters as predictors of persistent postnatal glucose intolerance: a comparative study between Afro-Caribbeans, Asians and Caucasians.

AIMS: To measure the prevalence of persistent glucose intolerance at 6-12 weeks postpartum in various ethnic groups to assess the value of targeted postpartum screening. METHODS: A retrospective study was performed using computerized databases from two large maternity units within one UK region. Both units used the same screening strategy for gestational diabetes mellitus (GDM) and the same postpartum follow-up at 6-12 weeks using a 75-g oral glucose tolerance test (OGTT). A total of 221 women with a diagnosis of GDM/impaired glucose tolerance (IGT) in the index pregnancy in addition to a completed postpartum 75-g OGTT were studied. Of these, 91 were Caucasian, 89 were of Indo-Asian (Asian) origin and 41 were of Afro-Caribbean origin. RESULTS: The study showed that 35% Indo-Asians had persistent postpartum glucose intolerance compared with 7% Caucasians and 5% Afro-Caribbeans (P < 0.003). Insulin requirement during pregnancy and a diagnosis of gestational diabetes prior to 20 weeks of pregnancy were predictive for persistent postpartum glucose intolerance amongst Indo-Asians. CONCLUSIONS: The frequency of postpartum glucose intolerance among Indo-Asian women is significantly greater than among age-matched Caucasian and Afro-Caribbean women. We suggest that all Indo-Asian women with gestational diabetes should undergo postpartum screening for persistent glucose intolerance. However, in non-Asian women selective screening may be more cost effective.

Adult↗

Arterial compression of the right common iliac vein; an unusual anatomical variant.

Compression of the left common iliac vein by the right common iliac artery has been well described (Cockett's syndrome). The authors describe a case report of compression of the right common iliac vein by the right internal iliac artery. The patient presented with ipsilateral lower limb oedema. Venography showed smooth extrinsic compression of the right common iliac vein. The CT scan was initially interpreted as showing no extrinsic mass or obvious compressing lesion and lymphography was normal. It was the duplex scan which showed the bifurcation of the right common iliac artery crossing the right common iliac vein and causing significant extrinsic compression.

Cardiovascular Abnormalities↗

The effects of storage on the biological activity of medicinal plants from Nepal.

The in vitro biological activity of 19 medicinal plants from Nepal was re-assessed after 6 years of storage. Methanol extracts from the plants were assayed for activity against six strains of bacteria and three strains of fungi. The extracts were tested with and without exposure to UV light in order to identify photoactivity. Out of the 19 plants tested, three lost all activity, six retained all activity, and ten had partial activity. The results will be of interest to traditional healers in Nepal, and may impact the sustainable harvesting of these medicinal plants.

Anti-Bacterial Agents↗

Sleep effects on ambulatory blood pressure measurements in pregnant women.

The aim of this study was to investigate the effect of the definition of daytime and nighttime on ambulatory blood pressure (ABP) in pregnancy. To determine the prevalence of a <10% decrease in mean arterial pressure with sleep (nondipper) in pregnancy and the consistency of nondipper status throughout pregnancy. In a prospective, longitudinal study, 102 pregnant woman underwent 24-h ABP monitoring and recorded sleep patterns at < or = 14, 19 to 22, 27 to 30, 35 to 37 weeks' gestation and 5 to 9 weeks' postpartum. Nighttime was defined by arbitrary hours or actual periods of sleep. Ambulatory blood pressure measurements using the different definitions of nighttime were compared in the total cohort and individual women. Nondipper status of each woman was determined throughout pregnancy and postpartum. At 35 to 37 weeks' gestation, 19% of women napped during the day and 20% were awake during the night. Throughout pregnancy, mean day and night systolic and diastolic ABP measurements were similar whether daytime and nighttime were defined by arbitrary hours or by sleep periods. In individuals, the use of arbitrary hours (day 07:00 to 21:59, night 22:00 to 06:59) compared to sleep periods to define day and night resulted in differences in daytime systolic (SBP) and diastolic blood pressure (DBP) of up to 4 and 5 mm Hg, respectively. Similarly there were individual differences in nighttime SBP up to 10 mm Hg and DBP up to 11 mm Hg. A third of women were nondippers at least once during pregnancy, but only two women were consistent nondippers. The different definitions of day and night did not change group ABP measurements, but resulted in significant variation in ABP measurements in individual pregnant women. Nondippers were common and nondipper status frequently changed during pregnancy.

Adult↗

Digital photography for mapping Mohs micrographic surgery sections.

BACKGROUND: Instant photographic print images have been used to diagram tissue sections excised for Mohs micrographic surgery (MMS). This approach is limited by the size of the print image, the potential difficulty of writing on a glossy photo print, and the cost of film. OBJECTIVE: We describe the use of digital photographic images as templates for making maps of tissue excised for MMS. METHODS: Digital photographic images of patients undergoing MMS are downloaded to a computer and printed onto plain paper. A map of the tissue excised for MMS is drawn directly onto the digital print. RESULTS: Several methods of creating MMS maps using digital photographic print images are described. CONCLUSION: Advantages of using digital photographs in MMS include speed of producing images, low cost of materials, greater accuracy of depicting the MMS excision defect, and ease of correlating the MMS map to the patient for subsequent stages of excision.

Computers↗

Systematic review of the clinical and cost effectiveness of digital hearing aids.

The aim of the present study was to systematically review the clinical and cost effectiveness of hearing aids which use digital signal processing relative to other forms of hearing aid technology, in particular analogue-based aids. A comprehensive search for randomized controlled trials, randomized crossover trials and economic studies was undertaken. Trial quality assessment and data extraction were undertaken by two independent reviewers. Eight trials comparing digital to non-digital devices were identified--one randomized controlled trial and seven randomized crossover trials. The majority of these studies were of small sample size and of poor methodological quality. In the majority of cases (nine out of 13), there was no evidence of a significant difference in either laboratory scores (nine out of 13 outcomes assessed) or user function/quality of life scores (six out of nine outcomes assessed) between digital and non-digital devices. In addition, there was no significant difference in patient preference for digital compared to control aids (relative risk 1.93; 95% CI 0.70-5.35) when pooled across studies. No cost-effectiveness studies directly comparing digital to non-digital devices were identified. In conclusion, the evidence identified by this review provides no significant evidence of the clinical benefit of digital devices compared to analogue-based aids. However, these results are difficult to generalize to current UK practice as the analogue aids and types of fitting in the trials are not those typically used in the NHS.

Acoustic Stimulation↗

Seasonal cold and circadian changes in blood pressure and physical activity in young and elderly people.

AIM: To test the hypothesis that there is no association between seasonal cold and the circadian responses of blood pressure, deep-body temperature and physical activity in healthy young and elderly men. METHODS: 25 healthy elderly (aged 70-82 years) and 21 young volunteers (aged 20-30 years) participated in a 3-year prospective cross-seasonal study. RESULTS: Ambulatory day-time blood pressures in the older men were higher in the winter than in the summer and higher in both seasons than in the young people. The seasonally related differences were associated with lower outdoor and indoor temperatures, lower body temperature and higher activity levels in the elderly group in the winter. The older but not the younger group had higher blood pressure and levels of physical activity at certain times of the day in the winter compared with the summer. CONCLUSION: Time-of-day winter increases in blood pressure in older people may be related to increased activity as well as to levels of ambient temperature. Although it is generally advantageous for older people to be physically active in order to prevent circulatory disease, there may be a rationale for advising that that they should avoid intense activity at certain times of the day, especially in the winter.

Adult↗

Evaluation of ambulatory and self-initiated blood pressure monitors by pregnant and postpartum women.

OBJECTIVE: To investigate the acceptability of an ambulatory blood pressure (ABP) monitor (SpaceLabs 90207) and a self-initiated blood pressure monitor (Omron HEM-705CP) to pregnant women. METHODS: Acceptability of the SpaceLabs 90207 and Omron HEM- 705CP monitors was evaluated, using a modified British Hypertension Device assessment form, by () healthy, pregnant women at <15 weeks (n = 120), 35-37 weeks (n = 81), and 5-9 weeks postpartum (n = 86); and () women with preeclampsia (n = 52). MAIN OUTCOME MEASURES: A monitor was acceptable if a woman graded the overall impression as "good" or "very good." RESULTS: Healthy women at <15 and 35-37 weeks' gestation and preeclamptic women reported the SpaceLabs 90207 monitor caused discomfort in 54%, 52%, and 60%, interfered with activities in 38%, 40%, and 23%, and disturbed sleep in 62%, 52% and 31%, respectively. Fewer than 12% in any group reported these problems with the Omron HEM-705CP monitor. In the 78 women who evaluated both monitors at 35-37 weeks, the SpaceLabs 90207 and Omron HEM-705CP were acceptable to 78% and 95% of healthy women, respectively (p = 0.005). Women with preeclampsia rated the Space-Labs 90207 as "bad" or "fair" (14%), "good" (58%), and "very good" (28%) compared with "bad" or "fair" (8%), "good" (28%), and "very good" (64%) for the Omron HEM-705CP monitor (p = 0.009). CONCLUSIONS: Pregnant women found the less intensive blood pressure monitoring with the Omron HEM-705CP more acceptable than the 24-h ABP monitoring with the SpaceLabs 90207. If accurate self-initiated blood pressure devices become available, pregnant women would prefer this method of home blood pressure monitoring.

Blood Pressure Monitoring, Ambulatory↗

Exercise-based rehabilitation for coronary heart disease.

BACKGROUND: The burden of cardiovascular disease world-wide is one of great concern to patients and health care agencies alike. Circulatory diseases, including myocardial infarction (MI) and stroke, kill more people than any other disease. Cardiac rehabilitation aims to restore patients who have suffered myocardial infarction to optimal health through exercise only based rehabilitation or comprehensive cardiac rehabilitation (eg. smoking cessation advice, diet and counselling as well as exercise). Data from two published and widely cited meta-analyses (Oldridge 1988, O'Connor 1989) of over 4,000 patients each have demonstrated that patients randomised to exercise-based cardiac rehabilitation after MI have a statistically significant reduction in all-cause and cardiac mortality of about 20 to 25% compared to patients receiving conventional care. However, the trials included were small and often of poor methodological quality. Incomplete literature review methods may have resulted in publication bias thereby resulting in an over-estimate of the benefit of cardiac rehabilitation. The randomised controlled trials used in the reviews have focused almost exclusively on low-risk, middle-aged males post MI, thereby excluding women and the elderly. OBJECTIVES: To determine the effectiveness of exercise only rehabilitation and exercise in addition to other rehabilitation interventions (termed comprehensive cardiac rehabilitation) compared with usual care on the mortality, morbidity, health-related quality of life (HRQoL) and modifiable cardiac risk factors of patients with coronary heart disease. SEARCH STRATEGY: Electronic databases were searched for randomised controlled trials, using standardised trial filters, from the earliest date available to December 31st 1998. SELECTION CRITERIA: Men and women of all ages, in both hospital-based and community-based settings, who have had myocardial infarction, coronary artery bypass graft or percutaneous transluminal coronary angioplasty, or who have angina pectoris or coronary artery disease defined by angiography have been included. Studies involving participants following heart transplant, heart valve surgery or heart failure have been excluded. Follow up periods of less than 6 months were excluded. DATA COLLECTION AND ANALYSIS: Studies were selected independently by two reviewers, and data extracted independently. Authors were contacted where possible to obtain missing information. MAIN RESULTS: The current systematic review has allowed analysis of an increased number of patients from approximately 4500 in the earlier meta-analyses to 7683 (2582 in exercise only and 5101 in the comprehensive cardiac rehabilitation group). The quality of reporting overall was poor, with generally high losses to follow up. The pooled effect estimate for total mortality for the exercise only intervention shows a 27% reduction in all cause mortality (random effects model OR 0.73 (0.54, 0.98)). Similarly, comprehensive cardiac rehabilitation reduced all cause mortality compared to usual care, but to a lesser degree (OR 0.87 (0.71, 1.05)). Total cardiac mortality was reduced by 31% (random effects model OR 0.69 (0.51, 0.94)) and 26% (random effects model OR 0.74 (0.57, 0.96)) in the exercise only and comprehensive cardiac rehabilitation intervention groups respectively when compared to usual care. Neither intervention had any effect on the ocurrence of non-fatal myocardial infarction. There was a significant net reduction in total cholesterol in the comprehensive cardiac rehabilitation group (pooled WMD random effects model -0.57 mmol/l (-0.83, -0.31)), but not the exercise only rehabilitation group. Similarly, LDL was significantly reduced in the comprehensive cardiac rehabilitation group (pooled WMD random effects model -0.51 mmol/l (-0.82, -0.19). The effect of exercise only rehabilitation or comprehensive cardiac rehabilitation interventions on revascularisation rates, blood pressure or smoking behaviour could not be determined by this meta-analysis due to the small number of trials reporting these outcomes and heterogeneity between trials. It was not possible to combine the data from studies reporting HRQoL as an outcome. Eighteen different instruments were used to assess HRQoL in the 11 studies reporting it as an outcome. The data are presented qualitatively, only one trial reporting significant improvements with the intervention. REVIEWER'S CONCLUSIONS: Exercise-based cardiac rehabilitation appears to be effective in reducing cardiac deaths but the evidence base is weakened by poor quality trials. It is not clear from this review whether exercise only or a comprehensive cardiac rehabilitation intervention is more beneficial. The population studied in this review is still predominately male, middle aged and low risk. Identification of the ethnic origin of the participants was seldom reported. (ABSTRACT TRUNCATED)

Coronary Disease↗

Proteomics of rat liver Golgi complex: minor proteins are identified through sequential fractionation.

The discovery of novel proteins resident to the Golgi complex will fuel our future studies of Golgi structure/function and provide justification for proteomic analysis of this organelle. Our approach to Golgi proteomics was to first isolate and characterize the intact organelle free of proteins in transit by use of tissue pretreated with cycloheximide. Then the stacked Golgi fraction was fractionated into biochemically defined subfractions: Triton X-114 insoluble, aqueous, and detergent phases. The aqueous and detergent phases were further fractionated by anion-exchange column chromatography. In addition, radiolabeled cytosol was incubated with stacked Golgi fractions containing proteins in transit, and the proteins bound to the Golgi stacks in an energy-dependent manner were characterized. All fractions were analyzed by two-dimensional (2-D) gel electrophoresis and identification numbers were given to 588 unique 2-D spots. Tandem mass spectrometry was used to analyze 93 of the most abundant 2-D spots taken from preparative Triton X-114 insoluble, aqueous and detergent phase 2-D gels. Fifty-one known and 22 unknown proteins were identified. This study represents the first installment in the mammalian Golgi proteome database. Our data suggest that cell fractionation followed by biochemical dissection of specific classes of molecules provides a significant advantage for the identification of low abundance proteins in organelles.

Animals↗

A prospective evaluation of anterior transposition of the inferior oblique muscle, with and without resection, in the treatment of dissociated vertical deviation.

BACKGROUND: Anterior transposition of the inferior oblique muscle (ATIO) has become a popular surgical treatment for dissociated vertical deviation (DVD), particularly in patients with coexisting inferior oblique muscle overaction (IOOA). We wanted to assess whether adding a resection improves the outcome compared with standard anteriorization. METHODS: We undertook a prospective, randomized evaluation of ATIO, with and without a 7-mm resection, in patients with DVD of at least 5 PD in one eye. We included 51 eyes of 30 patients, 26 eyes treated with the standard ATIO and 25 treated with a 7-mm resection added. We recorded the size of the preoperative and final DVD, grade of the preoperative and final IOOA, rates of reoperation, and complications. Mean follow-up was 15.4 months in the standard group and 25.0 months in the resection group, with a minimum of 4 months for all cases. RESULTS: The median preoperative and postoperative DVD was 12 PD and 4 PD in the standard group, respectively. This compared with 14 PD and 4 PD, respectively, in the resection group, representing no statistically significant difference in outcome. The presence or absence of IOOA did not influence the result of ATIO for either group. No significant complications of surgery occurred in either group. CONCLUSIONS: ATIO is an effective treatment for DVD and can be used to treat DVD in patients with or without IOOA, with few adverse effects. Our study revealed no advantage to adding a 7-mm resection to the standard procedure.

Adolescent↗