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Biomedical subjects

R Jones

Publications and source records attributed to R Jones.

At least 91 records · Page 5Linked to original sources

Exogenous motilin affects postprandial proximal gastric motor function and visceral sensation.

Our aim was to investigate the effect of motilin on postprandial proximal gastric motor and sensory function in healthy volunteers. Ten fasted, healthy volunteers were infused intravenously with synthetic motilin or placebo over 90 min. A liquid meal (200 ml) was ingested within 2 min at the start of the infusion. Proximal gastric volume was measured with a barostat device. Abdominal symptoms were scored by visual analog scales. Plasma motilin concentrations were measured using RIA. Endogenous motilin levels were not affected by meal ingestion. After meal intake, gastric relaxation was similar for motilin and placebo. After postprandial relaxation, motilin resulted in a faster return of gastric volume to baseline (P = 0.007). Motilin significantly increased postprandial feelings of nausea (P = 0.03) and tended to increase abdominal pain and abdominal tension. In conclusion, after normal postprandial gastric relaxation, motilin accelerated the return of gastric volume to baseline. In addition, motilin increased postprandial feelings of nausea.

Abdominal Pain↗

Survival in a cohort of social services placements in nursing and residential homes: factors associated with life expectancy and mortality.

The aim of this study was to examine the life expectancy of elderly people in nursing and residential care over a 20-month period and its relationship to specific risk factors. Using a retrospective cohort design, data obtained on 1888 residents placed between 1 July 1997 and 30 April 1999 in residential, nursing and dual registered homes within Nottingham Health Authority boundaries were examined. Additional data on physical and mental disability at placement were available for 514 residents. Main outcome measures comprised survival rate overall, and in relation to gender, age, home type (nursing, residential or dual), source of placement (hospital or community) and various disability factors.One-year survival rates were: overall, 66%; nursing homes, 59%; dual homes, 58%; and residential homes 76%. Median survival in nursing homes was 541 days, but was not reached in residential homes. Male gender, admission to nursing or dual registered homes, placement from hospital, decreased mobility and increased age were associated with decreased life expectancy. Although no association was found between length of survival and level of cognitive function, lack of cognitive impairment was associated with lower survival. In conclusion, mortality is high in nursing, dual and residential homes where life expectancy has been shown to be associated with gender, home type, origin of placement and mobility. Rates of survival are related to higher comorbidity and disability. Important data for planning and assessing care needs can be yielded through the analysis of mortality data.

Aged↗

Dose-related effects of motilin on proximal gastrointestinal motility.

AIM: To assess non-invasively the dose-response relations for the effects of exogenous motilin on antrum contraction frequency, gall-bladder volume and gastric myoelectrical activity. METHODS: In a double-blind, randomized, placebo-controlled, five-way crossover study, 10 fasted healthy volunteers were infused intravenously with synthetic human motilin (0.5, 1, 2 and 4 pmol x min/kg) or placebo for 60 min. Gall-bladder volume and antrum contractions were assessed by ultrasonography and gastric myoelectrical activity by electrogastrography. Motilin concentrations were measured using a radioimmunoassay. RESULTS: Baseline plasma motilin levels (60 pmol/L) were similar for all treatments. Motilin levels increased upon the start of infusion and rapidly returned to baseline after cessation of the infusion. At motilin doses of 2 and 4 pmol.min/kg, the antrum contraction frequency was significantly augmented, with maximum differences of two contractions per 2-min interval compared to placebo, while no changes in gastric myoelectrical activity were observed. Changes in gall-bladder volume were not significantly different for any of the motilin doses compared to placebo. CONCLUSIONS: Motilin increased antrum contraction frequency, whereas no effect on gastric myoelectrical activity was observed. Antrum contraction frequency appears to be a useful biomarker for motilin efficacy, and motilin doses of 2 and 4 pmol x min/kg were equally effective.

Adolescent↗

Current concepts in the management of Helicobacter pylori infection--the Maastricht 2-2000 Consensus Report.

Significant progress and new insights have been gained in the 4 years since the first Maastricht Consensus Report, necessitating an update of the original guidelines. To achieve this, the European Helicobacter Pylori Study Group organized a meeting of specialists and experts from around the world, representatives from National Gastroenterology Societies and general practitioners from Europe to establish updated guidelines on the current management of Helicobacter pylori infection. The meeting took place on 21-22 September 2000. A "test and treat" approach is recommended in adult patients under the age of 45 years (the age cut-off may vary locally) presenting in primary care with persistent dyspepsia, having excluded those with predominantly gastro-oesophageal reflux disease symptoms, non-steroidal anti-inflammatory drug users and those with alarm symptoms. Diagnosis of infection should be by urea breath test or stool antigen test. As in the previous guidelines, the eradication of H. pylori is strongly recommended in all patients with peptic ulcer, including those with complications, in those with low-grade gastric mucosa-associated lymphoid tissue lymphoma, in those with atrophic gastritis and following gastric cancer resection. It is also strongly recommended in patients who are first-degree relatives of gastric cancer patients and according to patients' wishes after full consultation. It is advised that H. pylori eradication is considered to be an appropriate option in infected patients with functional dyspepsia, as it leads to long-term symptom improvement in a subset of patients. There was consensus that the eradication of H. pylori is not associated with the development of gastro-oesophageal reflux disease in most cases, and does not exacerbate existing gastro-oesophageal reflux disease. It was agreed that the eradication of H. pylori prior to the use of non-steroidal anti-inflammatory drugs reduces the incidence of peptic ulcer, but does not enhance the healing of gastric or duodenal ulcer in patients receiving antisecretory therapy who continue to take non-steroidal anti-inflammatory drugs. Treatment should be thought of as a package which considers first- and second-line eradication therapies together. First-line therapy should be with triple therapy using a proton pump inhibitor or ranitidine bismuth citrate, combined with clarithromycin and amoxicillin or metronidazole. Second-line therapy should use quadruple therapy with a proton pump inhibitor, bismuth, metronidazole and tetracycline. Where bismuth is not available, second-line therapy should be with proton pump inhibitor-based triple therapy. If second-line quadruple therapy fails in primary care, patients should be referred to a specialist. Subsequent failures should be handled on a case-by-case basis by the specialist. In patients with uncomplicated duodenal ulcer, eradication therapy does not need to be followed by further antisecretory treatment. Successful eradication should always be confirmed by urea breath test or an endoscopy-based test if endoscopy is clinically indicated. Stool antigen test is the alternative if urea breath test is not available.

Adult↗

Is puberty getting earlier? The views of doctors and teachers.

AIMS: To determine the views of teachers, general practitioners (GPs) and paediatricians about whether there has been a recent change in the timing of the onset of puberty in children in the UK and in the timing of menarche in girls. DESIGN: Questionnaires were sent to a stratified random sample of each professional group. RESULTS: In relation to girls, almost 80% of teachers believe that the onset of puberty is occurring earlier and 73% feel that the menarche is occurring earlier. Those who had been working for longer than 10 years were more likely to say that the age of onset of puberty had decreased. GPs feel that both puberty and menarche are starting earlier, whereas paediatricians were evenly divided between those who thought puberty was starting earlier and those who thought that the timing had not changed. In boys, professionals generally believe that the timing of the onset of puberty has not altered significantly. CONCLUSION: Further study is required to determine whether puberty is really occurring earlier in girls.

Age of Onset↗

An interaction between the IL-4Ralpha gene and infection is associated with atopic eczema in young children.

BACKGROUND: A gain of function mutation (Q551- > R) in the IL-4 receptor alpha-chain (IL-4Ralpha) has been found to be associated with atopy in some studies but not others. The different results may be explained by interactions between the IL-4Ralpha polymorphism and environmental factors. OBJECTIVES: To identify interactions between the R551 mutation and environmental factors that are associated with atopy. METHODS: DNA from the Children in Focus (CiF) cohort of the Avon Longitudinal Study of Parents and Children (ALSPAC) was genotyped by heteroduplex formation for the presence of the R551 polymorphism. The data were then analysed for associations with flexural eczema as an indicator of atopic eczema, skin prick tests to allergens and serum IgE levels, and for interactions with environmental factors. RESULTS: A significant (P = 0.02) positive association was seen between the R551 polymorphism and flexural eczema in children up to 6 months of age who had not been given antibiotics, but not in children who had been given antibiotics. This association was maintained as a trend until 30 to 42 months of age but was no longer statistically significant. There was no significant association between the R551 polymorphism and positive skin prick tests or levels of serum IgE at 61 months of age, consistent with the effect of the R551 polymorphism being restricted to early life. CONCLUSION: There is an association between the R551 polymorphism and flexural eczema in children at 6 months of age who have not had infection requiring treatment with antibiotics. Restriction of the R551 association with eczema to children who have not had antibiotics lends support to the 'hygiene hypothesis', which states that exposure to infection in childhood can protect against allergic disease.

Bacterial Infections↗

Obstacles to effective treatment of depression: a general practice perspective.

BACKGROUND: The Clinical Standards Advisory Group (CSAG) was asked by UK health ministers to advise on the standards of clinical care attainable for people with depression. The GP survey reported here is one part of a multicomponent UK-wide study of services for depression that also included visits to a sample of services and structured patient telephone interviews. OBJECTIVES: The aim of this study was to survey GPs' perceptions of the availability and quality of primary and community-based services for people with depression, and to seek their views on barriers to the provision of good clinical services. METHODS: A structured postal questionnaire was sent to all GPs (3530) in the 11 geographical areas visited during the CSAG study. RESULTS: A total of 1703 (48%) GPs returned the questionnaire. The main obstacles to providing a good service for people with depression included not having enough time, a lack of services to refer to and difficulty in accessing services. More than half of the respondents (58%) were aware of guidelines for the management of depression, and 62% had attended a teaching session on depression within the last 3 years. Factors that influenced GPs to refer people with depression to other services were risk to the patient, a clear need for specialist treatment and the need for assessment. Overall, GPs appeared to be satisfied with the quality of specialist services. CONCLUSIONS: GPs appeared to view obstacles to providing effective treatment of depression as being more allied to external issues, in particular service provision, rather than internal factors such as their own knowledge and skills. The study revealed continuing concerns over excessive workload, and longstanding difficulties with the interface between primary and secondary mental health services.

Community Mental Health Services↗

Thyrotoxic periodic paralysis in a white woman.

A 24 year old white woman presented with sudden onset of flaccid quadriparesis and hypokalaemia. She was later found to be thyrotoxic. Paralysis resolved with potassium supplements, and after initiation of antithyroid medication she had no further episodes of hypokalaemic paralysis. To the best of the authors' knowledge, and after a Medline search, thyrotoxic periodic paralysis has not been described previously in a white woman.

Adult↗

Offering routine antenatal testing for HIV and hepatitis B in the rural setting of Cornwall.

Before Department of Health directives to offer HIV and hepatitis B (HBV) testing to all pregnant women, there was little such screening in Cornwall. Through a multiagency collaborative approach a new antenatal screening programme for HIV/HBV has been introduced with high uptake in the first year (HIV 92% and HBV 93%). We also report the findings of a questionnaire survey of community midwives who alone offer antenatal HIV/HBV testing in Cornwall.

Attitude of Health Personnel↗

Thermal double donors and quantum dots.

Combined local mode spectroscopy and ab initio modeling are used to demonstrate for the first time that oxygen atoms in thermal double donors (TDD) in Si are in close proximity. The observed vibrational modes in (16)O, (18)O, and mixed isotopic samples are consistent with a model involving [110] aligned oxygen chains made up of an insulating core lying between electrically active ends. The model also explains the minute spin density observed on oxygen in TDD(+) as well as the piezospectroscopic tensors of the donors. The analogy between the thermal donors and quantum dots is emphasized.

Journal Article↗

Waiting times. Quick quick slow.

In most hospitals, a two-week guaranteed maximum waiting time for cancer referrals will be a mathematical impossibility. Guaranteed waiting times require over-provision of appointments. Randomness makes it virtually impossible to allocate the 'correct' number of urgent appointment slots. Current appointment systems are not able to cope with the operational demands arising out of randomness. Randomness dictates that only a proportion of appointments can be offered a guaranteed time.

Appointments and Schedules↗