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Improving the detection and management of depression in primary care
  1. S M Gilbody1,
  2. P M Whitty2,
  3. J M Grimshaw3,
  4. R E Thomas4
  1. 1University of Leeds, Leeds, UK
  2. 2University of Newcastle, Newcastle upon Tyne, UK
  3. 3University of Ottawa, Ottawa, Canada
  4. 4University of Aberdeen, Aberdeen, UK
  1. Correspondence to:
 Dr S Gilbody, Academic Unit of Psychiatry and Behavioural Sciences, University of Leeds, Leeds LS2 9LT, UK;
 s.m.gilbody{at}leeds.ac.uk

Abstract

The effectiveness of screening and organisational strategies to improve the recognition and management of depression in primary care published in a recent issue of Effective Health Care is reviewed.

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This article is based on a recent issue of Effective Health Care which focused on the effectiveness of screening and organisational strategies to improve the recognition and management of depression in primary care.1

BACKGROUND

Depression is the second most common cause of disability worldwide.2 In the UK, depression is one of the most common reasons for consultation in general practice.3,4

While depressive disorders are common, they may go unrecognised.5–7 It has been reported that depressive symptoms are not recognised in about half of attending patients with depressive disorders in UK general practice.8–10 Unrecognised major depression is associated with poor treatment outcomes.11 Despite the frequency of presentation and the availability of effective interventions, the diagnosis and treatment of depression in primary care and by non-specialist practitioners may not be in line with current guidelines.12,13

The “NHS Plan” recognises the importance of depression and its management in primary care,14 and there are plans to recruit 1000 new primary care mental health workers by 2004. An improved level of integration between primary and secondary care and a shifting of roles for healthcare professionals is seen to be integral in optimising the management of depression in primary care.15

This article provides an overview of the effectiveness of strategies to improve the quality of care for those suffering from depression in primary care. The section on the use of questionnaires to detect depression in non-specialist settings is based on two systematic reviews.16,17 These reviews have been published previously and have been updated to include additional randomised and some controlled clinical trials18 and a related review.19,20

The section on educational and organisational interventions to improve the management and outcome of depression in primary care settings builds upon a review of all guideline implementation strategies commissioned by the UK NHS HTA programme21 and a Cochrane review of mental health workers in primary care.22 An additional search was carried out with the support of the Cochrane Effective Practice and Organisation of Care Group (EPOC) to identify interventions not covered by the HTA review.23

USING QUESTIONNAIRES TO DETECT DEPRESSION

There are a number of brief, easy to complete, standardised measures which have robust psychometric properties.24–28 These instruments can be administered in the waiting room and their results fed back to clinicians as an aid to individual clinical decision making. The hope is that the results of these questionnaires will improve recognition rates and the eventual outcome of depression in non-specialist settings.29 However, questions have been raised regarding whether all those with raised scores on questionnaires do have significant depressive illness.30

Sixteen studies that examined the role of the routine administration of standardised depression questionnaires in non-specialist settings and the feedback of these results to clinicians were identified.31–46 The details of the design and results of these studies are given in table 1.

Table 1

Studies evaluating the use of depression questionnaires in non-specialist settings

The identified studies used two methods of randomising patients: all patients irrespective of their score on the instrument or their likelihood of having a pre-existing psychiatric disorder (“unselected”), or only those with a probable psychiatric disorder by virtue of a score above some cut off or a positive diagnostic interview (“high risk”). The second approach involves the administration, scoring, and selective feedback of positive results by an administrative assistant. All but two studies42,45 randomised individual patients, so that clinicians received feedback for some of their patients and not for others, raising the problem of cross contamination between patient participants and dilution of effect.33,47 Three studies were non-randomised controlled clinical trials.31,37,44 The two clustered studies42,45 were prone to a “unit of analysis error”.47

To assess the recognition of depression, a meta-analysis of studies was performed (fig 1). Substantial heterogeneity existed between studies which was explained by the two differing randomisation approaches (“unselected” feedback versus “high risk” feedback). Unselected feedback did not improve the recognition of depression (relative risk (RR) 0.96, 95% CI 0.83 to 1.10). This effect remained when the non-randomised studies were included in the meta-analysis.31,37,44 High risk feedback was shown to be effective in increasing the rate of recognition of depression (RR 2.66, 95% CI 1.78 to 3.96). This intervention increased the rate of detection of depression by 27% (95% CI 14 to 40).

Figure 1

Forrest plot for studies examining the effect of feedback on the rate of recognition of depression.

Nine studies investigated the effect of the feedback of questionnaire results on the rate of intervention for emotional problems (such as referral to outside agencies and the commencement of treatment for depression).33,36,38–41,43–45 All but two38,39 showed non-significant results. Heterogeneity of methods and definition of an active intervention meant that overall pooling was not justified.

Eight studies examined the effect of routine questionnaires on the level of depression over time.10,31,39,41–43,45,48 No overall effect on depression was identified in seven of the eight studies. For example, in one study10 the Beck Depression Inventory was re-administered at 6 and 12 months and no significant difference was found between those on whom scores were fed back and controls. This study suggests that unrecognised depressive symptoms resolve over a 12 month period, irrespective of whether feedback was employed or not. Similarly, another study41 showed a lack of overall effect of GHQ feedback on subsequent GHQ scores.

Nine randomised and non-randomised controlled clinical trials assessing health related quality of life (HRQoL) questionnaires conducted in non-specialist settings were identified.49–57 All the instruments used included an assessment of mental well being, with specific questions relating to depression. The routine feedback of the findings of these instruments had no impact on the recognition of depression or on longer term psychosocial functioning in any of the studies. While clinicians welcomed the information these instruments imparted, their results were rarely incorporated into routine clinical decision making.16

EDUCATIONAL AND ORGANISATIONAL INTERVENTIONS

Thirty four studies (reported in 46 papers) examining educational and organisational interventions to improve the recognition and management of depression were identified.49–94

Effective strategies

Two major studies64,65 used a population based approach.95 Intensified care incorporating patient education, shared care between the primary care physician, psychiatrist and psychologist (using a cognitive-behavioural approach), were associated with improved treatment adherence and patient recovery rates. This intervention was cost effective, with a lower overall cost per successfully treated case.96 A sustained improvement in the management of depressive disorders was not seen beyond the period of enhanced organisational care,49 suggesting that clinician education alone was not sufficient to maintain change. A supplementary intervention targeted at those at high risk of recurrence of depression following acute phase treatment showed improved depression outcomes at 12 months, and concordance with medication.79 A related study offered enhanced care for patients not responding to usual care by a primary care physician.56,57

Complex quality improvement strategies—involving patient screening, clinician education, patient specific reminders, nurse case management, and enhanced integration of specialist care85,86,88–90—were effective in improving concordance and depression outcomes over 12 months, although this effect had disappeared at 24 month follow up.

Several studies showed that simple follow up by non-clinicians ensured that patients started on antidepressants were taking their medication and could discuss emerging difficulties.72,73,75,79,83,86 For example, brief 20 minute sessions with a practice nurse could substantially enhance medication concordance (OR 2.7, 95% CI 1.6 to 4.8, NNT 4), and depression outcome was improved in a subset of patients with major depression.68 Nurses were the providers of this care in several interventions.56,73,83,86 This support was given using weekly 10 minute telephone calls in one intervention.72

Clinician education on prescribing delivered by pharmacists to groups of physicians resulted in improved prescribing of antidepressants among patients over aged 60 (RR 0.55, 95% CI 0.33 to 0.92).92

Guideline implementation strategies targeted at the overall recognition and management of depression were only successful when educational interventions were accompanied by complex organisational interventions such as nurse case management,83 collaborative care,57 or intensive quality improvement.88

Ineffective strategies

A well designed UK study involved a clinician education and guideline implementation strategy that was well received in primary care76,77 but had no impact on either recognition rates for depression or clinical improvement.97 Less complex guideline implementation strategies conducted in the UK have also shown negative results.53,63 A further UK study of a guideline strategy involving identification of barriers to their implementation showed mixed results.78

Educational strategies were generally negative. For example, studies of clinician education, even when accompanied by audit and feedback or academic detailing,71 had no impact on depression, quality of life, or concordance with medication. Educational meetings, while improving clinicians’ knowledge and attitudes about depression,60 had no impact on practice or depression outcomes.69

Less intensive forms of continuous quality improvement that were not accompanied by a patient level intervention (such as nurse case management) were largely equivocal or negative.52,71 Similarly, chronic care clinics, combined with physician and nurse education about the importance of various conditions including depression, had no impact on the recognition of depression or health related quality of life in the elderly.62

IMPLICATIONS

The routine administration and feedback of simple questionnaires measuring depression or quality of life has no impact on the recognition, management, or outcome of depression in non-specialist settings.

Evidence suggests that, when depression questionnaires are administered and scored by an administrative assistant or practice nurse with feedback of results only if above a diagnostic threshold, detection rates of depression increase. However, there is no evidence that this actually influences clinical practice or clinical outcome.

Simple educational strategies to improve the recognition and management of depression, when given alone, have minimal impact on clinical practice and the outcome of depression. Pharmacist delivered educational interventions may be effective for improving prescribing.

Integrated quality improvement strategies involving combinations of clinician and patient education, nurse case management, enhanced support from specialist psychiatric services, and monitoring of drug concordance have been shown to be clinically and cost effective in the shorter term, but this effect disappears in longer term follow up.

Evidence regarding successful and unsuccessful strategies is in line with other reviews of organisational and educational interventions targeted at changing professional behaviour.98,99

Simple and relatively cheap telephone support, counselling, and medication monitoring delivered by counsellors or practice nurses are clinically effective and likely to be cost effective.

Many interventions shown to improve the management and outcome of depression in primary care will require substantial enhancement of the role of nurses and greater integration with secondary care. This is recognised as a major priority in current UK mental health policy.15 However, the investment of resources in primary care required will be substantial.

Implementation of the interventions presented in this review represents substantial organisational change and realignment of professional roles. Organisational research is needed to examine the optimum manner in which any change in professional roles and boundaries can be achieved. There are clear guidelines on the type of research needed to evaluate such interventions.100

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