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Revista Brasileira de Psiquiatria

Print version ISSN 1516-4446

Rev. Bras. Psiquiatr. vol.33 no.3 São Paulo Sept. 2011 Epub Mar 11, 2011

http://dx.doi.org/10.1590/S1516-44462011000300007 

Quality of life, diagnosis, and treatment of patients with major depression: a prospective cohort study in primary care

 

Qualidade de vida, diagnóstico e tratamento de pacientes com depressão maior: uma coorte prospectiva em cuidados primários

 

 

Ana Flávia Barros da Silva LimaI; Marcelo Pio de Almeida FleckII

IPost-Graduate Psychiatry Program, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
IIDepartment of Legal Medicine and Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil

Correspondence

 

 


ABSTRACT

OBJECTIVE: To describe the demographic and clinical characteristics, adequacy of antidepressant treatment, and changes in quality of life of patients with major depression receiving follow-up care from primary care centers.
METHOD: A cohort study was performed in which major depression patients were followed-up over a nine-month period. Several evaluation instruments were used, including the World Health Organization Quality of Life and the Quality of Life-Depression, Centers for Epidemiologic Studies-Depression questionnaires.
RESULTS: The sample comprised 179 individuals, mostly female (73%), with a mean age of 38 years and mean education of 9 years. At the end of the follow-up period, 42% of the individuals still presented with major depression, 25% had complete symptom remission, and only 9% were properly treated with antidepressants. In relation to quality of life, there were significant differences especially between baseline and after nine months in almost all measures.
CONCLUSION: This study demonstrated that depressive symptoms are poorly recognized and that treatment is often inadequate for patients followed-up in primary care units in the south of Brazil. Most of the patients continued to have symptoms of depression over the nine-month period which were associated with impaired quality of life.

Descriptors: Quality of life; Diagnosis; Depressive disorder, major; Primary health care; Signs and symptoms


RESUMO

OBJETIVO: Descrever o seguimento de usuários de serviços de cuidados primários com depressão maior em relação as suas características demográficas, clínicas, tratamento antidepressivo potencialmente adequado, assim como mudanças encontradas na qualidade de vida ao longo do acompanhamento.
MÉTODO: Foi realizado um estudo de coorte, no qual os sujeitos com depressão maior foram acompanhados ao longo de nove meses. Foram incluídas diversas medidas de avaliação, como World Health Organization Quality of Life, Quality of Life-Depression, Centers for Epidemiologic Studies- Depression Instrument, entre outras.
RESULTADOS: A amostra foi constituída por 179 sujeitos, a maioria do sexo feminino (73%), com uma idade média de 38 anos e 9 anos de escolaridade. Aos nove meses do estudo, 42% dos sujeitos ainda apresentavam um quadro compatível com depressão maior, 25% com remissão completa dos sintomas e somente 9% foram tratados com antidepressivo de forma adequada. Em relação à qualidade de vida, ocorreu diferenças significativas principalmente entre o período de baseline e nove meses para quase todas as medidas.
CONCLUSÃO: Este estudo demonstrou que pacientes com sintomas depressivos dificilmente são reconhecidos ou recebem tratamentos adequados em unidades de cuidados primários no sul do Brasil. A grande maioria dos pacientes permaneceu com sintomas depressivos ao longo dos nove meses, apresentando prejuízos na qualidade de vida.

Descritores: Qualidade de vida; Diagnóstico; Transtorno depressivo maior; Atenção primária à saúde; Sinais e sintomas


 

 

Introduction

Recent studies with depressed patients in primary care settings have demonstrated that these patients have several depression-related problems such as high rates of comorbidity, low functional levels, and increased use of medical resources.1,2 Despite their strong impact on the patients' lives, the recognition of depression-related problems is still poor in the primary sector, where 50% to 60% of the cases are not detected and do not receive adequate and specific treatment.1-3

Several studies have demonstrated the impact of depression on quality of life (QOL), with depressed patients displaying QOL impairments which are equal to or greater than those of patients with other chronic conditions.4-6 Another relevant aspect of this association is that the severity of the depressive disorder affects all QOL dimensions, even when controlled for other variables such as age.7,8 Although this association is well-established, most of the measures come from cross-sectional studies that do not permit an understanding of the causal relationship between the variables involved.

There are few observational studies or clinical tests with antidepressants based on the longitudinal investigation of the associations between depression and QOL measures in primary care.8-14 There is evidence suggesting the existence of a time gap between changes in depressive symptoms and QOL measures. In other words, the improvement in symptoms and in quality of life do not occur simultaneously, but rather at different times.8,13-15

The objective of this study is to describe the characteristics of a sample of Brazilian individuals with major depression seeking treatment in primary care units, as well as any changes in QOL over a nine-month follow-up period and its relation with antidepressant treatment.

 

Method

This study was carried out using a cohort obtained from the Longitudinal Investigation of Depression Outcomes (LIDO) study, the methodology of which is described below.

1. Description

The LIDO project was a multi-center cohort study carried out in six centers (Australia, Brazil, Spain, Israel, United States, and Russia) where primary care service users presenting with a diagnosis of major depressive disorder - current episode were accompanied for a one-year period.

This article describes the results of a cohort study based exclusively on data from the follow-up of Brazilian patients. The study was approved by the ethics committees of the Hospital de Clínicas and the Hospital Conceição, both in Porto Alegre, Brazil.

2. Sample selection

A screening interview was performed with 2,475 users of three primary care services in Porto Alegre that participated in the study in a consecutive manner, starting with their arrival at the health center between August 1998 and March 1999. The individuals were initially screened for depression using the Center for Epidemiologic Studies Depression Scale (CES-D; Radloff et al., 1977). Individuals with a CES-D score > 16 were invited for a more detailed interview to confirm a recent major depressive episode. This interview (called "baseline") was held up to two weeks after the initial contact by trained interviewers. The diagnosis of depression was confirmed in this interview using the Composite International Diagnostic Interview (CIDI).

Individuals who were diagnosed as having current major depression according to the CIDI (CIDI+), aged 18 to 75, living in the geographical area of the health center, and available over the next 12 months were invited to participate in the follow-up study. Individuals in treatment for depression or who had been in treatment up to three months before the study, those presenting with any psychiatric disorders such as psychosis or organic cerebral syndromes, and those who had any other condition that the main investigator felt could interfere in the study were excluded. Participants were assessed at baseline, six weeks, and three and nine months after baseline. After confirmation of the depression diagnosis, the physician responsible for the patient's care was informed by letter of the probable diagnosis of major depression. The decision to treat the depressive episode was left exclusively to the attending physician, since the study had a naturalistic observation design.

3. Definition of potentially adequate antidepressant treatment

Potentially adequate antidepressant treatment was defined as treatments based on the smallest doses recommended by the U.S. Agency for Health Care Policy and Research Guidelines for the Treatment of Depression in Primary Care (for example, 75mg of imipramine or 20mg of fluoxetine).

4. Instruments

Center for Epidemiologic Studies - Depression Scale (CES-D): The CES-D is a 20-item scale that has the objective of measuring depression symptoms in community populations.16 It is useful to screen for symptoms of depression, but not for confirming diagnosis. The subject answers questions based on the week preceding the evaluation using a four-point scale ranging from 0 (rarely) to 3 (most of the time). The total score is calculated using a simple sum that varies from 0 to 60. The cutoff point considered to differentiate individuals with symptoms of depression is 16.16

Quality of Life Depression Scale (QLDS): The QLDS is a specific measure of QOL for patients with depression. It consists of 34 items rated as true or false. False answers indicate an adverse effect on QOL, whereas true answers indicate a positive impact on QOL. The scores vary from 0 (good QOL) to 34 (poor QOL).17

Composite International Diagnostic Interview (CIDI): The CIDI is a structured interview developed to detect a variety of mental problems in primary care settings. This study used the depression module version 2.1.18

Brief version of the World Health Organization instrument to assess quality of life (WHOQOL-BREF): This is a reduced version of the 100-question World Health Organization instrument designed to assess QOL, the WHOQOL-100. This instrument was conjointly developed at 15 international centers and has been validated for the Portuguese language. The reduced version, with 26 questions, encompasses four domains (physical, psychological, social relations, and environment). There are four scales to assess intensity, capacity, frequency, and evaluation, with scores ranging from zero to four. In each scale, the scores range from 0 to 100, with higher scores suggesting better quality of life.19,20

Medical Outcomes Study Short-Forms (SF-12) and MHI-5 subscales of the SF-36: The SF-12 is an abbreviated version of the SF-36, with 12 items that assess two dimensions: physical and mental. The SF-36 is an instrument that assesses functional status and well-being and is divided into eight areas (physical functions, physical role limitations, emotional role limitations, social functioning, bodily pain, general mental health, vitality, and general health perceptions). Scores range from 0 to 100 in each area. The MHI-5 is a subscale of the SF-36, consisting of five items that assess mental health.21

Use of Health Resources: Identifies the use of health resources in three categories: primary care or outpatient service, day hospital, and in-patient service. It also describes the use of medications during the follow-up period.22

5. Statistical analysis

The chi-square test was used to compare category variables. A t test was used to compare continuous variables for dependent samples.

Mixed models were used for repeated-measures analysis with the visit as a fixed effect and diagonal variance-covariance matrix for comparison between groups.

 

Results

The sample consisted of 179 individuals, mostly female (73%), with a mean age of 38 years and mean education of 9. The other demographic and clinical characteristics recorded in the baseline visit are described in Table 1. At the end of the nine-month follow-up, 42% of the individuals still presented major depression (CIDI+), 68% presented depressive symptoms (CES-D > 16), and only 25% presented complete symptom remission (CIDI- and CES-D < 16). In relation to treatment, 73% of the patients did not receive any treatment during the study and only 9% were adequately treated with antidepressants. With regard to QOL, at the beginning of the study, 54.2% considered it to be good or very good, whereas 50.3% considered it to be good or very good at the end of the follow-up period, with no significant differences between these measurements.

Still concerning QOL, there were significant differences in almost all measures between the baseline visit and the final assessment and between the 6-week visit and the final assessment. Only the overall domain presented no significant differences between visits. The variation in the average WHOQOL scores was greater for the physical domain (55.6 to 64.9) and smaller for the environmental domain (50.30 to 54.14). The mean QOL and CES-D scores are described in Figures 1 and 2, respectively.

 

Discussion

This study presents two main findings. First, depression symptoms were poorly identified and poorly treated in the primary care network. At the end of the study, 42% of the individuals still presented major depression, and only 9% were in adequate treatment with antidepressants. Second, individuals with depression presented little improvement in QOL measures throughout the nine-month follow-up. The biggest difference in relation to the mean QOL scores was found between baseline and the nine-month visit, demonstrating that any changes occurring in these patients' life are not quickly observable.

In relation to the sample's clinical characteristics, 68% persisted with important symptoms of depression at the end of the study. The mean baseline CES-D score was 32 points, falling to 23 points at the last follow-up visit, with a small effect size between these measures. Another important fact is that only 27% of the individuals received any type of treatment such as counseling or medication for depression, and only 9% were adequately treated with antidepressants. It is important to underscore that the attending physicians were informed by letter of a probable diagnosis of depression identified by a standardized diagnostic instrument by the researchers. Thus, the data obtained in this study suggest that these subjects were either not identified as having depression symptoms - although the physicians had been advised about the probable diagnosis -, that their physicians prescribed no proper treatment, or that these patients had difficulties accessing the health resources available.

The poor detection of depression symptoms found here is in agreement with previous evidence suggesting that 51% of the patients treated in primary care continue to have these symptoms, and that only some years later are they referred to specialized care.23 The benefits of the treatment with antidepressants have been broadly demonstrated in the literature through clinical trials and in studies like the one by Skevington et al., where 74% of the participants received treatment with adequate antidepressants for an eight-week period and showed improvements in QOL.24 Beyond the medical perspective, there is also evidence that the therapy with antidepressants reduces the indirect costs of depression by decreasing the number of workdays lost and increasing productivity.25

Therefore, the low rate of complete remission in our study, of around 25%, is probably mainly due to the difficulty in identifying the diagnosis of depression, as well as the lack of appropriate treatment.

There is a great variability in relation to the remission indexes found in previous studies, with rates ranging from 24% to 68%.9,10,26-29 The recruitment of different populations, as well as the diversity of instruments and criteria used to evaluate remission, probably contribute to these differences.26 In relation to the other centers that participated in our study, our center had the lowest rate of remission, compared to 32% in St. Petersburg and 48% in Barcelona. This probably occurred due to the two abovementioned factors (non-identification of cases or inadequate treatment) or to the difficulty in the access to the health resources available. Vinamaki et al. performed a two-year follow-up study about the recovery from symptoms of depression in which 65% of the participants remained depressive, with the insufficient use of health services as a significant factor associated with non-recovery.26

This variable deserves a more detailed study since Brazil has serious problems regarding the access to health resources and to specialized treatment, especially due to economic barriers.30 Previous studies show that the costs of medication, the difficulties to obtain specialized care, and the barriers to reach healthcare units (long distances and transportation issues) are preponderant factors hindering the access to adequate treatment.21,31 Additionally, there is a number of variables that affect the treatment and that have complex interactions which are not fully understood to date, such as the perception, attitudes, and preferences of patients regarding depression and its treatment and the attitudes and training of physicians, all of which are likely to have an influence on the adherence to the treatment and the outcomes of therapeutic interventions.21,31,32

Concerning the assessment of QOL, all measures showed little change over the nine-month period, with small effect sizes between baseline and the final visit. In relation to the WHOQOL-BREF, the major differences were found in the physical, psychological, and social dimensions. Since the participants were selected while seeking medical care and since 95% of them had some clinical comorbidity, it is probable that the presence of these clinical conditions also had an impact on QOL, especially in what concerns the physical domain. In this study the authors used the SF-36 subscale and the WHOQOL-BREF because they measure different aspects of QOL and can function as complementary questionnaires. The WHOQOL-BREF is a generic measure of QOL and refers to the well-being of the individual, and the SF-36 is a health-related QOL measure that gauges functional status. Another aspect that must have contributed to the small improvement in QOL is the persistence of depression symptoms at the end of the study. This is in agreement with earlier evidence showing that emotional status exerts a great impact on QOL assessments, with a resulting variance of 20% in the overall WHOQOL scores, and that persistent negative mood affects all the domains measured by the WHOQOL.33,34

Our study had some limitations. The participants were selected while seeking assistance at primary healthcare units. Therefore, the sample probably comprised individuals with light to moderate depression, which restricts the generalization of these data to samples with more severe depression or seeking specialized services. Furthermore, the comparison of data related to QOL is further hampered by other factors. First, although the association between QOL and depression has already been extensively demonstrated in the literature,35-39 there are few studies in Latin America investigating this association with the same instruments used in this study.40,41 The WHOQOL has already been validated to several languages, but it is still little used in psychiatry, with only 12 articles assessing QOL in patients with major depression over the past 10 years. There is also a lack of normative data for QOL-related instruments such as the WHOQOL and the QLDS. All these factors make it difficult to interpret our results as well as to establish cutoff points for the comparison between measures.

Another aspect to be considered in the interpretation of the findings presented here is that most of the previous studies were cross-sectional, thus not permitting a better understanding of the association between QOL and depression. Naturalistic follow-up studies involving individuals with depression in the community or in primary care settings are scarce, generally covering a short period of time and comprising patients referred to specialized treatment.9 Over the past 10 years, there has been a growing interest in the study of variables related to QOL, with a more expressive number of one-year or longer follow-ups. However, there is still much confusion in the articles with regard to the concepts of QOL, recovery, and remission of symptoms, which in turn leads to confounding conclusions.42

 

Table 2

 

Conclusion

This study demonstrated that patients with symptoms of depression are poorly diagnosed and rarely receive adequate treatment in primary care units in the south of Brazil. Most of the patients continued to have symptoms of depression over the nine-month period of the study, with consequent QOL impairments. Since primary care services are generally the most used means of access to health care, especially in a country lacking specialized service, the non-detection of depressive disorders, as well as the non-provision of specific and adequate treatment, may cause important problems for the clinical evolution of depression and for QOL, potentially increasing indirect costs to society in general. This study warns of the need to implement training measures for health professionals in primary care settings so that they are able to detect and treat this disorder at an early stage and improve the QOL of individuals suffering from these symptoms.

 

Acknowledgements

The data described in this paper are part of the multicenter "Longitudinal Investigation Depression Outcome" study (LIDO). The authors thank Eli Lilly and Company for sponsoring the research and the Fundo de Incentivo à Pesquisa e Eventos do Hospital de Clínicas de Porto Alegre (FIPE/HCPA).

 


Click to enlarge

 

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Correspondence:
Ana Flávia Barros da Silva Lima
Rua Mariante, 288/407
90430-180 Porto Alegre, RS, Brazil
Phone: (+55 51) 3222-4566 Fax: (+55 51) 3378-9899

Submitted: August 30, 2009
Accepted: July 20, 2010