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Biomedical subjects

Deborah Sharp

Publications and source records attributed to Deborah Sharp.

At least 19 recordsLinked to original sources
PubMed2006

Clinical features of colorectal cancer before emergency presentation: a population-based case-control study.

OBJECTIVE: To identify the clinical features of colorectal cancer presenting as a surgical emergency. DESIGN: Population-based case-control study. SETTING: All general practices in Exeter Primary Care Trust, Devon, UK. Participants. 349 patients with colorectal cancer, 62 of these having an emergency presentation. Five randomly selected controls matched by age, sex and general practice for each case. DATA: The entire primary care record, from 24 months to 30 days before diagnosis, was coded using the International Classification of Primary Care-2. MAIN OUTCOME MEASURES: Symptom reporting by patients with emergency presentation of colorectal cancer compared with matched controls and non-emergency presentations. RESULTS: Eight features of colorectal cancer were associated with the 62 emergency presentations of colorectal cancer. 39 (63%) of patients had reported at least one symptom to their doctors a minimum of 30 days before the diagnosis. In multivariable analysis, three features remained independently associated with cancer: abdominal pain, odds ratio 6.2 (95% CI 2.8-14), P<0.001; loss of weight 3.4 (1.3-8.5), P=0.01; and diarrhoea 3.4 (1.2-5.7), P=0.02. When emergency presentations were compared with elective cases, abdominal pain was more common [interaction odds ratio 2.3 (1.6-3.3); P=0.047] and rectal bleeding less common [0.30 (0.08, 1.0); P=0.040]. CONCLUSION: The majority of patients destined to have an emergency presentation of colorectal cancer have reported symptoms of their cancer to their doctor well before the emergency. Some emergency presentations should therefore be preventable.

Abdominal Pain↗
PubMed2006

Negative chest X-rays in primary care patients with lung cancer.

BACKGROUND: The main investigation for suspected lung cancer in primary care is a chest X-ray. Reports from secondary care show that some patients with normal chest X-rays transpire to have lung cancer. The assumption is that this occurs rarely in primary care. AIM: The aim of this study was to examine the frequency of misleading chest X-rays in primary care, and whether there were any particular symptoms associated with them. DESIGN OF STUDY: Retrospective cohort study of the primary care records of 247 lung cancer patients diagnosed between 1998-2002. SETTING: All general practices in Exeter Primary Care Trust, Devon, UK. METHOD: All chest X-rays and all common symptoms of lung cancer reported to primary care were identified from the medical records. X-ray results were categorised into three groups by the radiologist's report: normal; abnormal but no malignancy suspected (together classified as negative X-rays); or abnormal with possible malignancy. RESULTS: Of the 247 patients, 164 (66%) had a chest X-ray taken in primary care during the year before diagnosis: 126 of these (77%) were abnormal with possible malignancy; 21 (13%) were abnormal but with no malignancy suspected; in 17 (10%) the X-ray was reported as normal. Thus, 38 of 164 patients (23%; 95% confidence interval = 16 to 32%) had a negative X-ray. Negative X-rays were less common in the 90 days before diagnosis. No particular symptoms were significantly associated with negative X-rays. CONCLUSION: Nearly a quarter of chest X-rays requested from primary care in lung cancer patients are negative. Further investigation is warranted with continuing or changing symptoms, even if the X-ray is not suggestive of malignancy.

Adult↗
PubMed2005

Factors associated with being a false positive on the General Health Questionnaire.

BACKGROUND: The General Health Questionnaire (GHQ) has been used extensively in community and primary care research as an alternative to longer, time-consuming and more expensive assessments of the common mental disorders of depression and anxiety. The sensitivity and specificity of the GHQ compared with longer more detailed assessments is between 70 and 80%. Though satisfactory, this raises the concern about the possibility of bias in relation to longer assessments. We studied socio-demographic factors that were associated with being a false positive on the GHQ in order to investigate any ascertainment bias in relation to more detailed assessments. METHOD: A total of 7,357 consecutive patients aged 16 and over, in five general practices in Cardiff, Bristol and Pontypridd, were invited to complete the 12-item GHQ. Of these, 1,154 patients scored 3 or more, our case definition on the GHQ, and completed a computerised version of the Revised Clinical Interview Schedule (CIS-R) together with a short socio-demographic questionnaire. RESULTS: Of the 1,154 subjects who were cases on the GHQ, 344 (30 %) (95% CI 27%-32%) were false positive and were not cases on the CIS-R. After adjustment for the other variables, including GHQ score, false positive subjects were more likely to be employed [odds ratio (OR) 2.7, 95% CI 1.4-5.3], owner-occupiers (OR 1.6, 95% CI 1.0-2.4) and to have a close friend or relative to talk to about personal problems (OR 2.2, 95 % CI 1.4-3.5). CONCLUSION: Our results suggest that in this study there was an ascertainment bias on the GHQ in relation to the CIS-R. Studies that use the GHQ to study the relationship between socio-economic status and common mental disorder could lead to biased estimates of association compared to studies that use the CIS-R. It is likely that the GHQ will lead to a higher estimate of prevalence than the CIS-R in subjects who are better off financially and who have better social support.

Adolescent↗
PubMed2005

Self-help books for depression: how can practitioners and patients make the right choice?

BACKGROUND: Depression is a common and important public health problem most often treated by GPs. A self-help approach is popular with patients, yet little is known about its effectiveness. AIM: Our primary aim was to review and update the evidence for the clinical effectiveness of bibliotherapy in the treatment of depression. Our secondary aim was to identify which of these self-help materials are generally available to buy and to examine the evidence specific to these publications. METHOD: Medline, CINAHL, EMBASE, PsycINFO, CCTR, PsiTri and the National Research Register were searched for randomised trials that evaluated self-help books for depression which included participants aged over 16 years with a diagnosis or symptoms of depression. Clinical symptoms, quality of life, costs or acceptability to users were the required outcome measures. Papers were obtained and data extracted independently by two researchers. A meta-analysis using a random effects model was carried out using the mean score and standard deviation of the Hamilton Rating Scale for Depression at the endpoint of the trial. RESULTS: Eleven randomised controlled trials were identified. None fulfilled CONSORT guidelines and all were small, with the largest trial having 40 patients per group. Nine of these evaluated two current publications, Managing Anxiety and Depression (UK) and Feeling Good (US). A meta-analysis of 6 trials evaluating Feeling Good found a large treatment effect compared to delayed treatment (standardised mean difference = -1.36; 95% confidence interval [CI] = -1.76 to -0.96). Five self-help books were identified as being available and commonly bought by members of the public in addition to the two books that had been evaluated in trials. CONCLUSION: There are a number of self-help books for the treatment of depression readily available. For the majority, there is little direct evidence for their effectiveness. There is weak evidence that suggests that bibliotherapy, based on a cognitive behavioural therapy approach is useful for some people when they are given some additional guidance. More work is required in primary care to investigate the cost-effectiveness of self-help and the most suitable format and presentation of materials.

Adolescent↗
PubMed2005

A qualitative study exploring how GPs decide to prescribe antidepressants.

BACKGROUND: To influence GPs' prescribing policies and practices it is necessary to have an understanding of how they make decisions. The limited evidence available suggests that not only do GPs find making decisions about diagnosing and prescribing for depression problematic, but that decisions are severely constrained by lack of resources. As a result, it might be thought that GPs, in line with current guidelines, will inevitably prescribe antidepressants for patients presenting with symptoms of anxiety and depression. This study examines the accuracy of this view. AIM: To explore how GPs decide to prescribe antidepressants. DESIGN: Focus groups with self-selected GPs. SETTING: Bristol and the surrounding district. METHOD: Qualitative study of five focus groups with 27 GPs. RESULTS: GPs' decisions about whether an antidepressant would be an appropriate form of management are shaped by a set of rules based on 'clinical' and 'social' criteria. The preferred strategy is to 'wait and see', but antidepressants are prescribed earlier when symptoms are perceived to be persistent, unresolving, severe and 'classic'. Decisions to prescribe are also shaped by organisational constraints of time, lack of accessible alternative management options, cost of prescribing and perceived patient attitude. CONCLUSION: The evidence from this study provides little support for the view that GPs take the easy option of prescribing antidepressants in the face of uncertainty. Evidence suggests that the GPs' prescribing was cautious, which indicates that GPs would support the initiative of recent draft guidelines regarding watchful waiting. This guidance, however, needs to be clear about what constitutes mild depression and address the question of prescribing to patients who are experiencing social adversity. Furthermore, alternatives to antidepressants such as counselling would need to be readily and equitably accessible. In addition, GPs need to be convinced that alternatives to antidepressants are at least as effective for patients with so-called 'mild depression'.

Antidepressive Agents↗
PubMed2004

Diagnosis of lung cancer in primary care: a structured review.

BACKGROUND: Lung cancer has the highest cancer incidence and mortality in the UK. Despite this, an individual GP encounters only one new presentation approximately every 8 months, so gains relatively little experience of its diagnosis. This is partly addressed by referral guidelines which aim to help GPs in selection of patients for chest X-ray or referral for specialist investigation. OBJECTIVE: The purpose of this study was to review the primary care presenting features of lung cancer, in the light of the UK Referral Guidelines for Suspected Cancer. METHODS: A structured literature review was carried out. RESULTS: Little research has been undertaken in primary care, and the predictive values for most symptoms are unknown. Approximate likelihood ratios could be calculated for six symptoms or signs: haemoptysis 13; fatigue 5.7; cough 5.3; finger clubbing 3.9; weight loss 2.9; and dyspnoea 1.5-5.7, but none of these figures derived from single primary care studies. Three recommendations for urgent investigation of possible lung cancer in the UK Referral Guidelines are questioned: for unexplained dyspnoea, hoarseness or cervical lymphadenopathy. For all these presentations, other serious diagnoses are more likely. CONCLUSION: The UK Guidelines for referral of suspected lung cancer have a weak evidence base.

Diagnosis, Differential↗
PubMed2004

Diagnosis of colorectal cancer in primary care: the evidence base for guidelines.

BACKGROUND: Colorectal cancer is common, causing approximately 11% of cancer deaths in the UK. However, a GP would only expect to see one new presentation each year. Referral guidelines outlining clinical scenarios of high risk have been published. These aim to help GPs select patients for rapid investigation. OBJECTIVES: The purpose of this study was to review the presenting features of colorectal cancer in primary care, using the basic structure of the UK Referral Guidelines for Suspected Cancer. METHODS: A structured literature review was carried out. RESULTS: Two symptoms have a high predictive value for cancer: rectal bleeding and change in bowel habit towards increased looseness or increased stool frequency. Other symptoms, such as abdominal pain, are so prevalent in the community that they have little predictive value. There is little published evidence on abdominal or rectal masses and iron deficiency anaemia as presenting features for colorectal cancer. However, these are so likely to have an important cause, investigation is mandated. Two areas in the Referral Guidelines are questioned: the need to defer investigation of change in bowel habit towards increased looseness or increased stool frequency for 6 weeks, and the low risk nature of constipation. CONCLUSION: The Referral Guidelines have a reasonable evidence base.

Colorectal Neoplasms↗
PubMed2004

The prediction of disruptive behaviour disorders in an urban community sample: the contribution of person-centred analyses.

BACKGROUND: Variable- and person-centred analyses were used to examine prediction of middle childhood behaviour problems from earlier child and family measures. METHOD: A community sample of 164 families, initially recruited at antenatal clinics at two South London practices, was assessed for children's behaviour problems and cognitive ability, maternal mental health, and the family environment when the children were 4 years old. At age 11, children, mothers, and teachers reported the child's disruptive behaviour, and mothers and children were interviewed to identify cases of disruptive behaviour disorders (DBD). RESULTS: Neither social class nor ethnicity predicted the child's disruptive behaviour at age 11. Rather, path analyses and logistic regression analyses drew attention to early behavioural problems, maternal mental health and the child's cognitive ability at 4 as predictors of disruptive behaviour at age 11. Cluster analysis extended these findings by identifying two distinct pathways to disruptive symptoms and disorder. In one subgroup children who showed intellectual difficulties at 4 had become disruptive by 11. In a second subgroup mothers and children both showed psychological problems when the child was 4, and the children were disruptive at age 11. The person-centred approach also revealed a high-functioning group of cognitively able 4-year-olds in supportive environments, at especially low risk for DBD. CONCLUSIONS: Combining variable- and person-centred analytic approaches can aid prediction of children's problems, draw attention to pertinent developmental pathways, and help integrate data from multiple informants.

Attention Deficit and Disruptive Behavior Disorder↗
PubMed2004

Symptomatic diagnosis of prostate cancer in primary care: a structured review.

BACKGROUND: Prostate cancer has the second highest cancer incidence and mortality in European men. Most prostate cancers are diagnosed after lower urinary tract symptoms (LUTS) are presented to primary care, but such symptoms more often have a benign cause. A general practitioner (GP) has to try and identify which of these patients have prostate cancer. AIMS: To review the presenting features of symptomatic prostate cancer. DESIGN OF STUDY: Structured review. METHOD: We searched Medline from 1980 to 2003 for symptoms, signs, and investigations reported in prostate cancer. This list was then expanded by secondary searches of reference lists. We excluded studies on post-diagnostic topics, such as staging, treatment, and prognosis; studies on non-Western patients; and studies on investigations that are not available in primary care. A second cycle of exclusions removed studies whose results would not guide a GP in deciding whether a patient has prostate cancer. RESULTS: No studies from primary care compared prostate cancer patients directly with controls. Two secondary care studies had enough information to allow a comparison of symptoms in cases compared with controls. In these studies, symptoms were generally more prevalent in cases, but the differences were small. Screening and secondary care studies suggest that early prostate cancer is symptomless, and that locally advanced cancer has LUTS that are similar to those for benign prostatic hypertrophy. CONCLUSION: There is a very weak evidence base for the primary care diagnosis of prostate cancer in men with lower urinary tract symptoms.

Family Practice↗
PubMed2004

Computerised patient-specific guidelines for management of common mental disorders in primary care: a randomised controlled trial.

BACKGROUND: A large proportion of people with depression and anxiety go unrecognised by their general practitioner (GP). Case-finding does not appear to be effective on its own. AIM: To compare the effectiveness of case-finding followed by computer-generated patient-specific guidelines with usual care for the management of common mental disorders in primary care. DESIGN OF STUDY: Individual patient randomised controlled trial. SETTING: Five general practices in Bristol and Cardiff. METHOD: 762 individuals aged >/= 16 years scoring >/= 12 on the Clinical Interview Schedule Revised were randomised. The experimental intervention required participants to complete a computerised psychosocial assessment that generated a report for the GP including patient-specific treatment recommendations. The control patients were treated as usual with access to locally agreed guidelines. RESULTS: Participants' 12-item General Health Questionnaire (GHQ) score dropped irrespective of treatment allocation. The experimental group had a significantly lower GHQ score at 6 weeks, but not at 6 months. Recovery at 6 months was 3% greater among those receiving the experimental intervention (95% confidence interval [CI] = -4 to 10). Treatment was not significantly associated with quality of life or patient satisfaction. CONCLUSION: Only small benefits are likely from using case-finding followed by patient-specific guidelines to improve clinical management of common mental disorders in primary care. However, depression and anxiety are important public health problems so the utility of such systems should be further investigated.

Adolescent↗
PubMed2003

Pathways to violence in the children of mothers who were depressed postpartum.

The impact of postnatal depression on a child's risk for violent behavior was evaluated in an urban British community sample (N=122 families). Mothers were interviewed during pregnancy, at 3 months postpartum, and when the child was 1, 4, and 11 years of age. Mothers, teachers, and children reported on violent symptoms at age 11. Structural equation modeling revealed that the child's violence was predicted by the mother's postnatal depression even when her depression during pregnancy, her later history of depression, and family characteristics were taken into account. Violence was associated with symptoms of attention-deficit/hyperactivity disorder and problems with anger management. Children were most violent if mothers had been depressed at 3 months and at least once thereafter.

Adolescent↗
PubMed2003

A systematic review of the effect of primary care-based service innovations on quality and patterns of referral to specialist secondary care.

BACKGROUND: Innovations are proliferating at the primary-secondary care interface, affecting referral to secondary care and resource use. Evidence about the range of effects and implications for the healthcare system of different types of innovation have not previously been summarised. AIM: To review the available evidence on initiatives affecting primary care referral to specialist secondary care. SETTING: Studies of primary-secondary care interface. METHOD: Systematic review of trials, using adapted Cochrane Collaboration (effective practice and organisation of care) criteria. Studies from 1980 to 2001 were identified from a wide range of sources. Strict inclusion criteria were applied, and relevant clinical, service and cost data extracted using an agreed protocol. The main outcome measures were referral rates to specialist secondary care. RESULTS: Of the 139 studies initially identified. 34 met the review criteria. An updated search added a further 10 studies. Two studies provided economic analysis only. Referral was not the primary outcome of interest in the majority of included studies. Professional interventions generally had an impact on referral rates consistent with the intended change in clinician behaviour. Similarly, specialist 'outreach' or other primary care-based specialist provider schemes had at least a small effect upon referral rates to secondary care with the direction of effect being that intended or rational from a clinical and sociological perspective. Of the financial interventions, one was aimed primarily at changing the numbers or proportion of referrals from primary to specialist secondary care, and the direction of change was as expected in all cases. The quality of the reporting of the economic components of the 14 studies giving economic data was poor in many cases. When grouped by intervention type, no overall pattern of change in referral costs or total costs emerged. CONCLUSION: The studies identified were extremely diverse in methodology, clinical subject, organisational form, and quality of evidence. The number of good quality evaluations of innovative schemes to enhance the existing capacity of primary care was small, but increasing. Well-evaluated service initiatives in this area should be supported. Organisational innovations in the structure of service provision need not increase total costs to the National Health Service (NHS), even though costs associated with referral may increase. This review provides limited, partial, and conditional support for current primary care-oriented NHS policy developments in the United Kingdom.

Family Practice↗
PubMed2003

The quality of record keeping in primary care: a comparison of computerised, paper and hybrid systems.

BACKGROUND: Computerised record keeping in primary care is increasing. However, no study has systematically examined the completeness of computer records in practices using different forms of record keeping. AIM: To compare computer-only record keeping to paper-only and hybrid systems, by measuring the number of consultations and symptoms recorded within individual consultations. DESIGN OF STUDY: Retrospective cohort study. SETTING: Eighteen general practices in the Exeter Primary Care Trust. METHOD: This study was part of a retrospective case control study of cancer patients aged over 40 years. All recorded consultations for a 2-year period were identified and coded for 1396 patients. Records were classified as paper, computer, or hybrid, depending on which medium stored the clinical information from consultations. RESULTS: More consultations were recorded in hybrid systems (median in 2 years = 11, interquartile range [IQR] = 6-18) than computer systems (median in 2 years = 9, IQR = 4-16.5) or paper systems (median in 2 years = 8, IQR = 5-14,): P <0.001. In a Poisson regression analysis, which included age, sex, and future cancer diagnosis, the rates of consultations recorded in paper and computer systems were 16% and 11% lower, respectively, than in hybrid systems. Fewer telephone consultations were recorded in paper systems, and fewer home visits in computer systems. Fewer symptoms were recorded in individual consultations on computer systems. Recording of absent symptoms and severity of symptoms was highest in paper systems. CONCLUSION: Hybrid systems of primary care record keeping document higher numbers of consultations than computer-only or paper-only systems. The quality of individual consultation recording is highest in paper-only systems. This has medicolegal implications and may impact upon continuity of care.

Aged↗