Systematic reviews and meta-analysis

Role of the community psychiatric nurse in the management of schizophrenia

This paper will describe the increasingly important role of the community psychiatric nurse (CPN) in the treatment and management of people with schizophrenia, and draw attention to new training programmes which have a focus on skills acquisition in evidence-based methods. However, before describing the way in which these programmes of training improve CPN skills, it is worth examining the history of community psychiatric nursing.

Mental health nurse prescribing: The research challenge

Nurse prescribing is gradually being implemented across a range of areas in healthcare. This paper examines the context of prescribing for mental health problems and discusses the issues relating to nursing and some of the broader matters such as the effectiveness of medication for mental health problems, the economics of mental illness and more general workforce issues. Mental health nurse prescribing obviously presents some significant research opportunities that should be seen within the settings of the Medical Research Council's framework for assessing complex health interventions (Campbell et al., 2000). The paper also considers some of the challenges of undertaking a randomised controlled trial for a topic within what Nancy Woolf (2000) describes as a 'socially complex service context'. Such a context requires the research team to consider a number of potential confounds. The paper concludes by suggesting some ways that such sources of confound be minimised.

A Systematic Review of the Efficacy of Centella asiatica for Improvement of the Signs and Symptoms of Chronic Venous Insufficiency

We aimed to assess the efficacy of Centella asiatica for improvement of the signs and symptoms of chronic venous insufficiency (CVI). We searched 13 electronic databases including the Cochrane Central Register of Controlled Trials for randomised controlled trials assessing the efficacy of Centella asiatica for CVI. Two review authors independently selected studies, assessed the risks of bias of included studies and extracted data. The treatment effects of similar studies were pooled whenever appropriate. Eight studies met the inclusion criteria. The pooling of data of similar studies showed that Centella asiatica significantly improved microcirculatory parameters such as transcutaneous partial pressure of CO2 and O2, rate of ankle swelling and venoarteriolar response. Three out of the eight studies did not provide quantitative data. However, these studies reported that patients treated with Centella asiatica showed significant improvement in CVI signs such as leg heaviness, pain and oedema. Our results show that Centella asiatica may be beneficial for improving signs and symptoms of CVI but this conclusion needs to be interpreted with caution as most of the studies were characterised by inadequate reporting and thus had unclear risks of bias, which may threaten the validity of the conclusions.

Review of Interventions to Improve Family Engagement and Retention in Parent and Child Mental Health Programs

Engaging and retaining families in mental health prevention and intervention programs is critically important to insure maximum public health impact. We evaluated randomized-controlled trials testing methods to improve family engagement and retention in child mental health programs published since 1980 (N = 17). Brief, intensive engagement interventions in which providers explicitly addressed families' practical (e.g. schedules, transportation) and psychological (e.g. family members' resistance, beliefs about the treatment process) barriers as they entered treatment were effective in improving engagement in early sessions. The few interventions found to produce long-term impact on engagement and retention integrated motivational interviewing, family systems, and enhanced family stress and coping support strategies at multiple points throughout treatment. Few interventions have been tested in the context of prevention programs. There are promising approaches to increasing engagement and retention; they should be replicated and used as a foundation for future research in this area.

Cognitive behavioural therapy for depression, panic disorder and generalized anxiety disorder: a meta-regression of factors that may predict outcome

OBJECTIVE

To determine which factors impact on the efficacy of cognitive behavioural therapy (CBT) for depression and anxiety. Factors considered include those related to clinical practice: disorder, treatment type, duration and intensity of treatment, mode of therapy, type and training of therapist and severity of patients. Factors related to the conduct of the trial were also considered, including: year of study, country of study, type of control group, language, number of patients and percentage of dropouts from the trial.

METHOD

We used the technique of meta-analysis to determine an overall effect size (standardized mean difference calculated using Hedges' g) and meta-regression to determine the factors that impact on this effect size. We included randomized controlled trials with a wait list, pill placebo or attention/psychological placebo control group. Study participants had to be 18 years or older and all have diagnosed depression, panic disorder (with or without agoraphobia) or generalized anxiety disorder (GAD). Outcomes of interest included symptom, functioning and health-related quality of life measures, reported as continuous variables at post-treatment.

RESULTS

Cognitive behavioural therapy for depression, panic disorder and GAD had an effect size of 0.68 (95% CI=0.51-0.84, n=33 studies, 52 comparisons). The heterogeneity in the effect sizes was fully explained by treatment, duration of therapy, inclusion of severe patients in the trial, year of study, country of study, control group, language and number of dropouts from the control group. Disorder was not a significant predictor of the effect size.

CONCLUSIONS

Cognitive behavioural therapy is significantly less effective for severe patients and trials that compared CBT to a wait-list control group found significantly larger effect sizes than those comparing CBT to an attention placebo, but not to a pill placebo. Further research is needed to determine whether CBT is effective when provided by others than psychologists and whether it is effective for non-English-speaking patient groups.

Comparing the effects of antidepressants: consensus guidelines for evaluating quantitative reviews of antidepressant efficacy

With increasing numbers of treatment options available for patients with major depression over the last decade and the growing body of evidence describing their efficacy and safety, clinicians often find it difficult to determine the best and most appropriate evidence-based treatment for each patient. Systematic reviews utilizing statistical methods that synthesize and evaluate data from a number of studies have become increasingly more available over the past decade. We review major findings and lessons learned from salient examples of quantitative analyses of antidepressant research and provide recommendations for meta-analysts, journal and grant reviewers, and research 'consumers' (ie, clinicians) for conducting, reporting, and evaluating such analyses.

Appraisal of published reviews of research on psychotherapy and counseling with adults 1990-1998

Reviews and meta-analyses of research on adult psychotherapy and counseling with adults published in English from 1990 to 1998 (N = 255) were rated according to the criteria advanced by A. D. Oxman and G. H. Guyatt (1988). A majority of the reviews fell substantially short of these basic standards; on average, review articles met only half of the 8 criteria, and only 20% met 7 or more of the criteria. Common deficiencies included failure to describe comprehensive search methods used to locate studies; failure to explain inclusion and exclusion criteria for studies; and failure to provide reliable, unbiased assessments of the studies reviewed. The reviews showed no tendency to improve over the period studied.

Randomised controlled trials investigating pharmacological and psychological interventions for treatment-refractory depression. Systematic review

BACKGROUND

About 30% of people with depression do not respond to an antidepressant at the recommended dose and can be described as having treatment-refractory depression.

AIMS

To summarise the findings from all randomised controlled trials (RCTs) that have assessed the efficacy of a pharmacological or psychological intervention for treatment-refractory depression.

METHOD

We used a systematic search strategy to identify RCTs that included adults aged 18-75 years with a diagnosis of unipolar depression that had not responded to a 4-week course of a recommended dose of an antidepressant.

RESULTS

We identified 16 RCTs. None of the included trials assessed the efficacy of psychotherapy. All the trials were too small to detect an important clinical response. We found only two trials on lithium augmentation, which randomised 50 subjects in total.

CONCLUSIONS

There is little evidence to guide the management of depression that has not responded to a course of antidepressants. Treatment-refractory depression is an important public health problem and large pragmatic trials are needed to inform clinical practice.

Epidemiology in community psychiatric research: common uses and methodological issues

OBJECTIVE

Epidemiological principles underpin much medical research particularly that concerned with the planning and evaluation of health services, including research in community and social psychiatry. The aim of this paper is to review some of the common uses of epidemiology in community psychiatric research and to discuss some methodological issues that arise frequently in epidemiological research in community settings.

METHODS

This is a review of the relevant literature and of the work currently in progress in the department of psychological medicine of the university of Wales College of Medicine.

RESULTS

Among the many uses of epidemiology in health care, four are especially relevant in community psychiatric settings: the assessment of the mental health needs of the population (four approaches are described: the collection of routine data, surveys of existing patients, surveys of the general population and statistical modelling), the identification of risk factors of disease, the contribution to prevention and the assessment of the clinical effectiveness of health care interventions. The most important methodological issues include causal inference which in epidemiology takes the form of explaining the association between an exposure and disease (chance, bias, confounding, reverse causality and causality), the issue of confounding and how to adjust for it and issues arising in the context of specific study designs.

CONCLUSION

Epidemiology has become a set of methods used to investigate a wide range of clinical questions. Population based research is an essential part of clinical research but epidemiological knowledge is also needed by clinicians in order to critically appraise and interpret the scientific literature.

Psiquiatria baseada em evidências

Em psiquiatria, observa-se grande variabilidade de práticas clínicas, muitas vezes desnecessária. Essas variações podem estar relacionadas à ausência de evidência científica confiável ou ao desconhecimento das evidências de boa qualidade disponíveis. A medicina baseada em evidências (MBE) é uma combinação de estratégias que busca assegurar que o cuidado individual do paciente seja baseado na melhor informação disponível, a qual deve ser incorporada à prática clínica. Neste artigo, conceitos de MBE são discutidos com relação a aspectos e desafios no tratamento de pacientes com distimia, bulimia nervosa e esquizofrenia. A partir de resultados de três revisões sistemáticas recentemente publicadas, conclui-se que a prática de psiquiatria baseada em evidências acrescenta qualidade à prática psiquiátrica tradicional.

Training for the mental health workforce: a review of developments in the United Kingdom

OBJECTIVE

Implementation of the National Mental Health Strategy has important implications for education and training of the Australian mental health workforce. This paper discusses relevant developments in the United Kingdom that may provide some lessons for Australia.

METHOD

A review was undertaken of a number of specific clinical education and training programs for mental health workers in the United Kingdom which have been subjected to published evaluation.

RESULTS AND CONCLUSIONS

A finite mental health resource base dictates that education and training activity should: (i) be evaluated; (ii) target those clients most in need; (iii) include evidence-based approaches such as assertive community treatment, medication management, cognitive-behaviour therapy and family interventions; and (iv) prepare mental health workers in the core competencies needed to implement these approaches. Two programs, developed in the United Kingdom, which meet these criteria are presented as examples of best practice: the nurse therapy model established by Isaac Marks; and the Thorn initiative established in association with the Institute of Psychiatry, London and the University of Manchester.

Evidence based health care in old age psychiatry

OBJECTIVE

The purpose of this article is to present the current status and future needs of old age psychiatry in relation to evidence-based health care.

METHOD

The opportunities and difficulties of evidence-based medicine as applied to old age psychiatry are described. Depression is used as a specific example. The role of the Cochrane Collaboration and of clinical guidelines in dealing with these difficulties are discussed.

RESULTS

There has been a tendency for drug studies to focus on younger age groups and to exclude patients with comorbidity or polypharmacy. Aspects of clinical management separate from drugs are given insufficient attention. The generalizability of current studies is a problem in old age psychiatry.

CONCLUSIONS

Psychiatry is no less part of medicine than any other specialty. Increased attention to studies of effectiveness, as opposed to efficacy, is indicated. The Cochrane Collaboration is an international network which promotes and conducts systematic reviews of the effectiveness of health care. Systematic reviews can increase the generalizability of the current knowledge base and better define the needs for future research.