Biomedical subjects

Stephen Campbell

Publications and source records attributed to Stephen Campbell.

16 recordsLinked to original sources

PubMed2005

Plasma total homocysteine levels in stroke patients screened for the vitamin intervention for stroke prevention clinical trial in the era of folate fortification.

Folic acid fortification of grain products was mandated in the USA by January 1998 and in Canada by November 1998. It was hypothesized that screening total plasma homocysteine levels adjusted for age, sex, race and country that were drawn in stroke patients for the Vitamin Intervention for Stroke Prevention trial from 1997 to 2001 would be steady when fortification was completed. Samples were grouped by years 1997/1998, 1999 and 2000/2001, and adjusted means were calculated using a general linear regression model. In 2,612 US and 1,059 Canadian patients, levels showed no consistent trend in the USA alone, while Canadian levels declined (p = 0.06 overall, 0.0003 in the oldest age group). US levels were 0.39 micromol/l (95% CI: -0.08, 0.85) lower than in Canada. Neither fasting nor time since stroke affected the results.

Adult↗

PubMed2005

Testing a European set of indicators for the evaluation of the management of primary care practices.

BACKGROUND: Effective practice management is an important prerequisite for offering good clinical care. Internationally valid, reliable and feasible indicators and instruments are needed to describe and compare the management of primary care practices in Europe. OBJECTIVE: This paper describes development and evaluation of the European Practice Assessment instrument and indicators (Engels Y, Campbell S, Dautzenberg M et al. Developing a framework of, and quality indicators for, general practice management in Europe. Fam Pract 2005; 22(2): 215-22). METHODS: The study design was a validation and feasibility study set in 273 general practices in Austria, Belgium, France, Germany, Israel, The Netherlands, Slovenia, Switzerland and the UK. Use was made of a set of 62 valid quality indicators derived previously from an international Delphi procedure. The EPA instrument, based on this set of indicators, was used to collect data in the 273 practices. This instrument consists of self-completed questionnaires for doctors, staff managers and patients. In addition, there is an interview schedule for use by an outreach visitor, to be held with the lead GP or manager, and a visitor checklist. The instrument was analysed using expert review by the project partners, factor and reliability analyses, ANOVA analyses and by determining intraclass correlations. RESULTS: Fifty-seven indicators were found to be valid, feasible, reliable and discriminative in all participating countries. The instrument was able to determine differences in practice management within and between countries. All (but one) practices completed the assessment procedure. The data collection method appeared to be feasible, although some aspects can be improved. CONCLUSION: The EPA instrument provides feedback to practices that facilitates quality improvement and can compare primary care practices on a national and an international level.

Europe↗

PubMed2005

Developing a framework of, and quality indicators for, general practice management in Europe.

OBJECTIVES: To develop a framework for general practice management made up of quality indicators shared by six European countries. METHODS: Two-round postal Delphi questionnaire in the setting of general practice in Belgium, France, Germany, The Netherlands, Switzerland and the United Kingdom. Six national expert panels, each consisting of 10 members, primarily primary care practitioners and experts in the field of quality in primary care participated in the study. The main outcome measures were: (a) a European framework with indicators for the organization of primary care; and (b) ratings of the face validity of the usefulness of the indicators by expert panels in six countries. RESULTS: Agreement was reached about a definition of practice management across five domains (infrastructure, staff, information, finance, and quality and safety), and a common set of indicators for the organization of general practice. The panellist response rate was 95%. Sixty-two indicators (37%) were rated face valid by all six panels. Examples include out of hours service, accessibility, the content of doctors' bags and staff involvement in quality improvement. No indicators were rated invalid by all six panels. CONCLUSIONS: It proved to be possible to develop a European set of indicators for assessing the quality of practice management, despite the differences in health care systems and cultures in the six different countries. These indicators will now be used in a quality assessment procedure of practice management in nine European countries. While organizational indicators are part of the new GMS contract in the UK, this research shows that many practice management issues within primary care are also of relevance in other European countries.

Delphi Technique↗

PubMed2005

Do Personal Medical Services contracts improve quality of care? A multi-method evaluation.

OBJECTIVES: To assess whether the new contractual arrangements of first-wave Personal Medical Services (PMS) practices in England improved their quality of care, compared with changes in care provided in a control sample of General Medical Services (GMS) practices. METHODS: Controlled 'before' (at or near 1 April 1998) and 'after' (at or near 31 March 2001) quantitative observational study in a sample of 23 PMS and 23 GMS practices. Quantitative data focused on access, chronic disease management, mental health care, primary care of older people, costs and patient evaluation using the General Practice Assessment Survey. Case studies were also undertaken in all PMS pilots, involving interviews with general practitioners, nurses, practice managers and Health Authority and Primary Care Group/Trust managers, documentation review, and analysis of site-specific data. RESULTS: There were improvements in quality of care in PMS sites in all areas of care evaluated, but improvements in care over and above those found in GMS sites (the 'PMS effect') were only statistically significant for angina care (P = 0.05) and elderly care (P = 0.04). Teamwork, shared culture, clear objectives and leadership were important catalysts for quality improvement in PMS sites. Improvements in PMS practices came at additional financial cost. There were concurrent improvements in GMS practices. No PMS site succeeded in meeting its aims without successfully introducing effective leadership and management, and changing relationships within the practice (e.g. equalising power between nurses and doctors). CONCLUSIONS: Small but steady improvements were observed in English primary care. PMS contracts facilitated quality improvements in specific areas over and above these broad improvements (the 'PMS effect') during the study period. New contractual arrangements for health care can be used to improve quality of care. However, the mechanisms that resulted in quality gains, while facilitated by the new contractual arrangements, were not specific or unique to the PMS experiment. Factors such as effective management, clear objectives and flexible professional relationships within practices are likely to be important in determining whether new contractual arrangements result in improved outcomes. The context within which care and services are provided is as important for quality innovations as specific contractual arrangements.

Chronic Disease↗

PubMed2004

Randomised controlled trial and economic evaluation of a chest pain observation unit compared with routine care.

OBJECTIVES: To measure the effectiveness and cost effectiveness of providing care in a chest pain observation unit compared with routine care for patients with acute, undifferentiated chest pain. DESIGN: Cluster randomised controlled trial, with 442 days randomised to the chest pain observation unit or routine care, and cost effectiveness analysis from a health service costing perspective. SETTING: The emergency department at the Northern General Hospital, Sheffield, United Kingdom. PARTICIPANTS: 972 patients with acute, undifferentiated chest pain (479 attending on days when care was delivered in the chest pain observation unit, 493 on days of routine care) followed up until six months after initial attendance. MAIN OUTCOME MEASURES: The proportion of participants admitted to hospital, the proportion with acute coronary syndrome sent home inappropriately, major adverse cardiac events over six months, health utility, hospital reattendance and readmission, and costs per patient to the health service. RESULTS: Use of a chest pain observation unit reduced the proportion of patients admitted from 54% to 37% (difference 17%, odds ratio 0.50, 95% confidence interval 0.39 to 0.65, P < 0.001) and the proportion discharged with acute coronary syndrome from 14% to 6% (8%, -7% to 23%, P = 0.264). Rates of cardiac event were unchanged. Care in the chest pain observation unit was associated with improved health utility during follow up (0.0137 quality adjusted life years gained, 95% confidence interval 0.0030 to 0.0254, P = 0.022) and a saving of pound 78 per patient (- pound 56 to pound 210, P = 0.252). CONCLUSIONS: Care in a chest pain observation unit can improve outcomes and may reduce costs to the health service. It seems to be more effective and more cost effective than routine care.

Algorithms↗

PubMed2004

Soft governance and attitudes to clinical quality in English general practice.

OBJECTIVES: English primary care organisations (primary care groups and trusts - PCGs, PCTs) were, and are, responsible for the quality of general practice but lack hierarchical structures and, frequently, contractual relationships through which to influence it. The theory of soft governance describes how managers can influence professional practice by other means. This study examines the hypothesis that PCG/Ts have used 'soft' clinical governance. METHODS: Survey in 2000/01 of general practitioners' (GPs') attitudes, opinions and self-reported activity in six PCGs and six PCTs using a semi-structured mailed questionnaire. To assess how representative respondents were of English GPs generally, four questions from a national sample survey of English GPs were included and the results compared. RESULTS: Responses were obtained from 437 (52%) GPs. They most often mentioned the technical aspects of clinical governance. Managerial, policy and resourcing implications were next most frequently mentioned, usually in unfavourable terms. Most GPs reported that their clinical practice had changed because of clinical governance activities, although nearly 40% also reported little difference in the quality of care provided. The National Service Framework for coronary heart disease influenced practice independently of PCG/T activities. CONCLUSION: English primary care organisations are exercising soft governance (although not by that name) over some but not all aspects of GPs' clinical practice. However, this soft governance is complex, not easy to sustain and appears hard to extend beyond essentially clinical domains.

Attitude of Health Personnel↗

PubMed2003

Molecular analysis of a recombinant M-MuLV/RaLV retrovirus.

A replication-competent retrovirus was isolated from Rat1 cells after stable transfection of a defective Moloney murine leukemia virus (M-MuLV) provirus bearing mutations in two conserved cysteines of the TM protein. Immunoprecipitation of the viral proteins indicated the infectious virus is not related to M-MuLV. Electron microscopy of budding virions revealed a mammalian type C virus. The host range of the virus is limited to rat cells. N-terminal sequence analysis of the capsid-associated protein identified the virus to be related to rat leukemia virus (RaLV). Analysis of the cloned sequences indicated a recombinant provirus with a genetic organization in which the leader region and open reading frames of the endogenous RaLV are flanked by identical M-MuLV LTRs at both ends. These results highlight the effects of exogenous viral infection on endogenous viruses.

Animals↗

PubMed2003

The impact of chronic disease management in primary care on inequality in asthma severity.

Chronic disease management (CDM) is now widely available in primary care, but methods of delivery are highly variable. The focus of this study was to examine whether CDM provided in asthma clinics was more effective in reducing the severity of asthma symptoms, particularly for deprived populations. There was no evidence of 'inverse care' in the provision of CDM in clinics and good evidence that it was associated with a reduction in the severity of asthma symptoms for both deprived and affluent populations.

Aged↗

PubMed2003

Is the quality of care in general medical practice improving? Results of a longitudinal observational study.

BACKGROUND: The demand for increased accountability within health care has led to a myriad of government initiatives in the United Kingdom, with the aim of improving care, setting minimum standards, and addressing poor performance. AIM: To assess the quality of care in English general practice in the year 2001 compared with 1998, in terms of access, interpersonal care, and clinical care (chronic disease management, elderly care, and mental health care). DESIGN OF STUDY: Observational study in a purposive sample of general practices in England. SETTING: Twenty-three general practices in England--eight in North Thames, seven in the North West, and eight in the South West. RESULTS: Outcome measures were: quality of chronic disease management (angina, adult asthma and type 2 diabetes from practice questionnaires and medical record review), elderly care and mental health care (from practice questionnaires), access to care, continuity of care and interpersonal care (from practice and patient questionnaires) and costs (mean change in practice budget between 1998 and 2001). There were significant improvements in quality of care in terms of organisational access to services (P = 0.016), practice organisation of chronic disease management (P = 0.039), and the quality of angina care (P = 0.003). There were no significant changes in quality scores for mental health care, elderly care, access and interpersonal care. The mean practice budget rose by 3.4% between 1998 and 2001 (adjusted for inflation). CONCLUSION: These findings provide evidence of improvements in some aspects of the quality of care, achieved at modest cost. This was achieved during a time when the National Health Service was undergoing a series of reforms. However, primary care in England is characterised by variation in care, with significant improvements still possible.

Adult↗

PubMed2002

Users' understanding of medical knowledge in general practice.

Much emphasis is now being placed on the quality of medical care, and various ways are being developed to assess the medical knowledge of general practitioners. It is increasingly recognised that the users perspective on health care is important, and that the views of health care professionals do not and cannot represent patients' views. In order to explore whether or not a large-scale survey, which asked people to rate their doctors' medical knowledge, yielded meaningful results, this paper draws on findings from a study involving in-depth interviews with 26 lay people who had already completed the General Practice Assessment Survey questionnaire. When completing the questionnaires, patients had been asked to consider the 'technical care' provided by their general practitioners and to make a judgement about their doctors' medical knowledge. When interviewed at a later date, some people explained that they defined medical knowledge as knowledge of 'disease and treatments', while others defined it as knowledge of the 'whole person', and some defined a knowledgeable doctor as one who would acknowledge uncertainty. Patients appeared to have made judgements about their general practitioners' medical knowledge based on many factors, such as their experience of illness, perceptions of professional training, contact with other health care professionals in both primary and secondary care, and exposure to the media. The paper discusses the nature of medical knowledge, and concludes that although patient surveys are useful for the evaluation of interpersonal care and access to care, asking patients about their general practitioners' medical knowledge may yield invalid results. This is partly because patients defined medical knowledge in different ways, and partly because it appears that relatively few patients had enough knowledge about their own particular illnesses, or about possible alternative treatments, to make informed judgements about their general practitioners' medical knowledge.

Clinical Competence↗

PubMed2002

User involvement in clinical governance.

OBJECTIVES: To investigate the involvement of users in clinical governance activities within Primary Care Groups (PCGs) and Trusts (PCTs). Drawing on policy and guidance published since 1997, the paper sets out a framework for how users are involved in this agenda, evaluates practice against this standard and suggests why current practice for user involvement in clinical governance is flawed and why this reflects a flaw in the policy design as much as its implementation. DESIGN: Qualitative data comprising semi-structured interviews, reviews of documentary evidence and relevant literature. SETTING: Twelve PCGs/PCTs in England purposively selected to provide variation in size, rurality and group or trust status. PARTICIPANTS: Key stakeholders including Lay Board members (n = 12), Chief Executives (CEs) (n = 12), Clinical Governance Leads (CG leads) (n = 14), Mental Health Leads (MH leads) (n = 9), Board Chairs (n = 2) and one Executive Committee Lead. RESULTS: Despite an acknowledgement of an organizational commitment to lay involvement, in practice very little has occurred. The role of lay Board members in setting priorities and implementing and monitoring clinical governance remains low. Beyond Board level, involvement of users, patients of GP practices and the general public is patchy and superficial. The PCGs/PCTs continue to rely heavily on Community Health Councils (CHCs) as a conduit or substitute for user involvement; although their abolition is planned, their role to be fulfilled by new organizations called Voices, which will have an expanded remit in addition to replacing CHCs. CONCLUSIONS: Clarity is required about the role of lay members in the committees and subcommittees of PCGs and PCTs. Involvement of the wider public should spring naturally from the questions under consideration, rather than be regarded as an end in itself.

Community Participation↗

PubMed2002

How useful are clinical features in the diagnosis of acute, undifferentiated chest pain?

OBJECTIVES: To measure the predictive value and diagnostic performance of clinical features used to diagnose coronary syndromes in patients presenting with acute, undifferentiated chest pain. METHODS: The clinical features of patients presenting to the authors' chest pain unit with acute, undifferentiated chest pain were prospectively recorded on a standard form. Admitted patients were followed up by case note review. Discharged patients were followed up as outpatients three days later. Six months after the emergency department visit, evidence of adverse events was searched for from the hospital computer database, case notes, and the patient's primary care physician. The authors tested the power of each feature to predict: 1) acute myocardial infarction (AMI) by World Health Organization criteria, and 2) any acute coronary syndrome (ACS), evidenced by cardiac testing, AMI, arrhythmia, death, or revascularization procedure within six months. RESULTS: Eight hundred ninety-three patients were assessed, 34 (3.8%) with AMI and 81 (9.1%) with ACS. Features useful in the diagnosis of AMI were exertional pain [likelihood ratio (LR) = 2.35], pain radiating to the shoulder or both arms (LR = 4.07), and chest wall tenderness (LR = 0.3). Features useful in the diagnosis of ACS were exertional pain (LR = 2.06) and pain radiating to the shoulder, the left arm, or both arms (LR = 1.62). The site or nature of pain and the presence of nausea, vomiting, or diaphoresis were not predictive of AMI or ACS. CONCLUSIONS: Important differences exist when clinical features are specifically investigated in patients with acute chest pain and a nondiagnostic electrocardiogram. Clinical features have a limited role to play in triage decision making.

Acute Disease↗

PubMed2002

Reversal by dithiothreitol treatment of the block in murine leukemia virus maturation induced by disulfide cross-linking.

We previously reported that if murine leukemia virus particles are produced in the presence of the mild oxidizing agent disulfide-substituted benzamide-2, they fail to undergo the normal process of virus maturation. We now show that treatment of these immature particles with a reducing agent (dithiothreitol) induces their maturation in vitro, as evidenced by proteolytic cleavage of Gag, Gag-Pol, and Env proteins and by their morphology. The identification of partial cleavage products in these particles suggests the sequence with which the cleavages occur under these conditions. This may be a useful experimental system for further analysis of retroviral maturation under controlled conditions in vitro.

3T3 Cells↗

PubMed2002

Reversible binding of recombinant human immunodeficiency virus type 1 gag protein to nucleic acids in virus-like particle assembly in vitro.

Recombinant human immunodeficiency virus type 1 (HIV-1) Gag protein can assemble into virus-like particles (VLPs) in suitable buffer conditions with nucleic acid. We have explored the role of nucleic acid in this assembly process. HIV-1 nucleocapsid protein, a domain of Gag, can bind to oligodeoxynucleotides with the sequence d(TG)(n) with more salt resistance than to d(A)(n) oligonucleotides. We found that assembly of VLPs on d(TG)(n) oligonucleotides was more salt resistant than assembly on d(A)(n); thus, the oligonucleotides do not simply neutralize basic residues in Gag but provide a binding surface upon which Gag molecules assemble into VLPs. We also found that Gag molecules could be "trapped" on internal d(TG)(n) sequences within 40-base oligonucleotides, rendering them unable to take part in assembly. Thus, assembly on oligonucleotides requires that Gag proteins bind near the ends of the nucleic acid, and binding of Gag to internal d(TG)(n) sequences is apparently cooperative. Finally, we showed that nucleic acids in VLPs can exchange with nucleic acids in solution; there is a hierarchy of preferences in these exchange reactions. The results are consistent with an equilibrium model of in vitro assembly and may help to explain how Gag molecules in vivo select genomic RNA despite the presence in the cell of a vast excess of cellular mRNA molecules.

Gene Products, gag↗

PubMed2002

Inequalities in morbidity and consulting behaviour for socially vulnerable groups.

BACKGROUND: The focus of health policy on improving health and reducing inequality for socially vulnerable groups. AIM: To examine self-report of condition-specific morbidity and consultation with the general practitioner (GP) for socially vulnerable groups. DESIGN OF STUDY: Cross-sectional survey using a modified version of the General Practitioner Assessment Survey (GPAS). SETTING: Ten general practices in each of six health authorities. METHOD: A random sample of 200 patients was selected from each practice. The questionnaire elicited information about experience of specific acute and chronic conditions and whether the GP had been consulted. Four sub-samples were selected from the 4493 registered patients who responded to the self-completion questionnaire. They were lone mothers (n = 160), elderly living alone (n = 417), the unemployed (n = 100), and members of ethnic minority groups (n = 316). RESULTS: Logistic regression analyses showed that, after adjustment for age, sex, smoking, and housing tenure, only lone motherhood and ethnic minority group status were consistently and independently associated with poorer health outcomes. Lone motherhood was associated with a higher likelihood of anxiety (odds ratio [OR] = 2.03, 95% confidence interval [CI] = 1.34 to 3.08) and sleep problems (OR = 1.83, 95% CI = 1.18 to 2.83) and ethnic minority group status with a higher likelihood of depression (OR = 2.02, 95% CI = 1.34 to 3.04), diabetes (OR = 4.03, 95% CI = 2.54 to 6.39, migraine (OR = 1.72, 95% CI = 1.26 to 2.35), and minor respiratory symptoms (OR = 1.75, 95% CI = 1.33 to 2.29). Ethnic minority group status was the only source of social vulnerability that was independently associated with a higher likelihood of GP consultation, particularly for episodes of illness such as backache (OR = 3.28, 95% CI = 2.06 to 5.21), indigestion (OR = 2.94, 95% CI = 1.53 to 5.65), migraine (OR = 3.22, 95% CI = 1.75 to 5.93), minor respiratory symptoms (OR = 3.53, 95% CI = 2.26 to 5.50) and sleep problems (OR = 4.72, 95% CI = 2.56 to 8.71). CONCLUSIONS: Social vulnerability can be a risk factor for poorer health, but this is dependent on the source of vulnerability and is condition-specific. No association was found between inequity in the utilisation of primary care and social vulnerability. The propensity for members of ethnic minority groups to consult more than white people, particularly for acute conditions, requires further exploration.

Adolescent↗

PubMed2002

A qualitative study of the cultural changes in primary care organisations needed to implement clinical governance.

BACKGROUND: It is commony claimed that changing the culture of health organisations is a fundamental prerequisite for improving the National Health Service (NHS). Little is currently known about the nature or importance of culture and cultural change in primary care groups and trusts (PCG/Ts) or their constituent general practices. AIMS: To investigate the importance of culture and cultural change for the implementation of clinical governance in general practice by PCG/Ts, to identify perceived desirable and undesirable cultural attributes of general practice, and to describe potential facilitators and barriers to changing culture. DESIGN: Qualitative: case studies using data derived from semi-structured interviews and review of documentary evidence. SETTING: Fifty senior non-clinical and clinical managers from 12 purposely sampled PCGs or trusts in England. RESULTS: Senior primary care managers regard culture and cultural change as fundamental aspects of clinical governance. The most important desirable cultural traits were the value placed on a commitment to public accountability by the practices, their willingness to work together and learn from each other, and the ability to be self-critical and learn from mistakes. The main barriers to cultural change were the high level of autonomy of practices and the perceived pressure to deliver rapid measurable changes in general practice. CONCLUSIONS: The culture of general practice is perceived to be an important component of health system reform and quality improvement. This study develops our understanding of a changing organisational culture in primary care; however, further work is required to determine whether culture is a useful practical lever for initiating or managing improvement.

Attitude of Health Personnel↗