A major depression prognosis calculator based on episode duration

The pathophysiology and management of depression in cardiac surgery patients

Background

Depression is common in the cardiac surgery population. This contemporary narrative review aims to explore the main pathophysiological disturbances underpinning depression specifically within the cardiac surgery population. The common non-pharmacological and pharmacological management strategies used to manage depression within the cardiac surgery patient population are also explored.

Methods

A total of 1291 articles were identified through Ovid Medline and Embase. The findings from 39 studies were included for qualitative analysis in this narrative review.

Results

Depression is associated with several pathophysiological and behavioral factors which increase the likelihood of developing coronary heart disease which may ultimately require surgical intervention. The main pathophysiological factors contributing to depression are well characterized and include autonomic nervous system dysregulation, excessive inflammation and disruption of the hypothalamic-pituitary-adrenal axis. There are also several behavioral factors in depressed patients associated with the development of coronary heart disease including poor diet, insufficient exercise, poor compliance with medications and reduced adherence to cardiac rehabilitation. The common preventative and management modalities used for depression following cardiac surgery include preoperative and peri-operative education, cardiac rehabilitation, cognitive behavioral therapy, religion/prayer/spirituality, biobehavioral feedback, anti-depressant medications, and statins.

Conclusion

This contemporary review explores the pathophysiological mechanisms leading to depression following cardiac surgery and the current management modalities. Further studies on the preventative and management strategies for postoperative depression in the cardiac surgery patient population are warranted.

Problematic features of episode-based definitions of depression and a preliminary proposal for their replacement

Episodes of depression are constructed by imposing temporal and symptom-severity thresholds onto symptom levels that vary over time, resulting in a loss of information. Consequently, it is widely acknowledged that binary categorization of depressive episodes is problematic. Binary classification can make similar symptom levels appear different and different symptom levels appear similar. Furthermore, symptom severity is only one of several thresholds that are applied in the construction of depressive episodes in DSM-5 and ICD-11, others being: a minimum duration of symptoms, the application of a “no significant symptoms” threshold for remission, and time requirements (e.g., 2  months) for remission. Application of each of these thresholds leads to a loss of information. The joint occurrence of these four thresholds creates a complex set of circumstances in which similar patterns of symptoms may be categorized differently and different patterns may be categorized as similar. The ICD-11 definition can be expected to lead to better classification than the DSM-5 approach since it does not require two symptom-free months for remission, eliminating one of four problematic thresholds. A more radical change would be to adopt a truly dimensional perspective which would need to incorporate new elements to reflect time spent at various levels of depression. Such an approach, however, seems feasible both in clinical practice and research.

Duration of untreated illness and clinical correlates in first-episode and drug-naïve patients with major depressive disorder

BACKGROUNDS

The notion that a prolonged duration of untreated illness (DUI) leads to poorer outcomes has contributed to extensive changes in mental health services worldwide. However, most studies on DUI have focused on schizophrenia and related psychosis. This study aimed to assess the possible relationship between DUI and certain clinical correlates in first-episode and drug-naïve patients with major depressive disorder (MDD).

METHODS

This cross-sectional study recruited 1718 first-episode and drug-naïve MDD outpatients. All participants were scored on the Hamilton Depression Rating Scale, Hamilton Anxiety Rating Scale, Positive and Negative Syndrome Scale, and thyroid hormone and metabolic parameters were measured. We used the Structure Clinical Interview for DSM-IV for clinical diagnosis and investigated suicide attempts through face-to-face interviews.

RESULTS

A total of 171 (10%) of MDD patients had co-morbid psychiatric symptoms. Participants who were older, with lower education level, and married were less likely to seek a timely treatment compared to the counterparts. One-month longer untreated duration was associated with 2% to 9% higher odds of being with most of the investigated clinical conditions. For those with the longest DUI, the risk was increased for most of the investigated clinical conditions, with absolute risk differences ranging from 5.19% to 29.48%.

CONCLUSIONS

These findings suggest that longer DUI may be negatively associated with clinical correlates in MDD. Further long-term follow-up studies are warranted to confirm these preliminary results.

Healthy Minds: Group Cognitive-Behavioral Intervention for Sustainable Return to Work After a Sick Leave Due to Depression

Background Depression is one of the major causes for sick leave and loss of productivity at work. Many studies have investigated return to work (RTW) interventions for people with common mental disorders. However, a paucity of studies has targeted depressive symptoms in the workplace, as well as work productivity. Objectives This study presents preliminary results on a novel group intervention based on cognitive behavioral principles in order to optimize sustainable RTW, by reducing clinical symptoms (anxiety and depression) and improving work productivity. Method This pilot study followed a quasi-experimental design, with participants randomly receiving the group intervention (N = 19) or only receiving usual services (N = 11, control group). The group intervention called Healthy Minds for Sustainable RTW consists of eight sessions based on cognitive behavioral therapy principles and techniques. Outcome measures on depressive and anxiety symptoms and work productivity were administered at baseline (i.e. the start of return-to-work or gradual RTW), as well 2 months later (post-intervention), and at 6-month follow-up. Results The results did not show a time × group interaction for symptoms of depression or anxiety (p = 0.07). Those who received the group intervention however did see a within-group reduction in anxiety and depressive symptoms over time, clinically significant for the group intervention only. A significant time × group interaction for work productivity was found, with those in the intervention group improving over time compared to the control condition. Conclusion Although replication is needed, these results suggest that a brief group cognitive-behavioral intervention specifically tailored to work-related issues is promising. Future studies are warranted, particularly with larger samples and remote webconferencing delivery.

Cost-Effectiveness of Providing the Depression Care for People With Cancer Program to Patients With Prostate Cancer in the United States

OBJECTIVES

The Depression Care for People with Cancer program (DCPC) is a cost-effective depression care model for UK patients with cancer. However, DCPC's cost-effectiveness in the United States is unknown, particularly for patients with prostate cancer in the United States. This study evaluates the health and economic impact of providing DCPC to patients with prostate cancer.

METHODS

DCPC was compared with usual care in a mathematical model that simulates depression and its outcomes in a hypothetical cohort of US patients with prostate cancer. DCPC was modeled as a sequential combination of universal depression screening, post-screening evaluations, and first-line combination therapy. Primary outcomes were lifetime direct costs of depression care, quality-adjusted life-years (QALYs), and incremental cost-effectiveness ratios. Secondary outcomes included life expectancy, number of depression-free months and lifetime depressive episodes, duration of depressive episodes, cumulative incidence of depression, lifetime depression diagnoses/misdiagnoses, and the cumulative incidence of maintenance therapy for depression. Sensitivity analyses were used to examine uncertainty.

RESULTS

In the base case, DCPC dominated usual care by offering 0.11 more QALYs for $2500 less per patient (from averted misdiagnoses). DCPC also offered 5 extra depression-free months, shorter depressive episodes, and a lower chance of maintenance therapy. DCPC's trade-offs were a higher cumulative incidence of depression and more lifetime depressive episodes. Life expectancy was identical under usual care and DCPC. Sensitivity analyses indicate that DCPC was almost always preferable to usual care.

CONCLUSION

Compared with usual care, DCPC may offer more value to US patients with prostate cancer. DCPC should be considered for inclusion in prostate cancer survivorship care guidelines.

Electroconvulsive therapy (ECT) for moderate-severity major depression among the elderly: Data from the pride study

BACKGROUND

Electroconvulsive therapy (ECT) is usually reserved for treatment of severe major depressive disorder (MDD), but may be equally effective in the treatment of moderate-severity MDD. This possibility, however, has only been studied to a very limited extent. We therefore investigated the efficacy of ECT after stratifying patients into severe MDD and moderate-severity MDD.

METHODS

We used data from the Prolonging Remission in Depressed Elderly (PRIDE) study, in which 240 patients (≥60 years) with MDD were treated with right unilateral ultrabrief pulse ECT, combined with venlafaxine. We used the six-item core depression subscale (HAM-D₆) of the Hamilton Depression Rating Scale to define depression severity. Participants with baseline total scores ≥12 on the HAM-D₆ were considered to have severe MDD, while those with HAM-D₆ total scores <12 were considered to have moderate-severity MDD.

RESULTS

Among the participants with severe MDD and moderate-severity MDD, the mean change in the HAM-D₆ total score from baseline to endpoint was -8.2 (95% confidence interval (95%CI) = -7.5; -9.0, paired t-test: p < 0.001) and -5.9 (95%CI = -5.1; -6.6, paired t-test: p < 0.001), respectively. A total of 63% of those with severe MDD and 75% of those with moderate-severity MDD achieved remission (HAM-D₆ total score ≤4) (Pearson's 2-sample chi-squared test of difference between groups: p = 0.27).

LIMITATIONS

The PRIDE study was not designed to address this research question.

CONCLUSIONS

ECT combined with venlafaxine appears to be an effective treatment for moderate-severity MDD. It may be appropriate to expand the indications for ECT to include patients with moderate-severity MDD.

Optimum strata boundaries and sample sizes in health surveys using auxiliary variables

Using convenient stratification criteria such as geographical regions or other natural conditions like age, gender, etc., is not beneficial in order to maximize the precision of the estimates of variables of interest. Thus, one has to look for an efficient stratification design to divide the whole population into homogeneous strata that achieves higher precision in the estimation. In this paper, a procedure for determining Optimum Stratum Boundaries (OSB) and Optimum Sample Sizes (OSS) for each stratum of a variable of interest in health surveys is developed. The determination of OSB and OSS based on the study variable is not feasible in practice since the study variable is not available prior to the survey. Since many variables in health surveys are generally skewed, the proposed technique considers the readily-available auxiliary variables to determine the OSB and OSS. This stratification problem is formulated into a Mathematical Programming Problem (MPP) that seeks minimization of the variance of the estimated population parameter under Neyman allocation. It is then solved for the OSB by using a dynamic programming (DP) technique. A numerical example with a real data set of a population, aiming to estimate the Haemoglobin content in women in a national Iron Deficiency Anaemia survey, is presented to illustrate the procedure developed in this paper. Upon comparisons with other methods available in literature, results reveal that the proposed approach yields a substantial gain in efficiency over the other methods. A simulation study also reveals similar results.

Stratégies de retour au travail d’employés ayant fait l’expérience d’une dépression : perspectives des employeurs et des cadres des ressources humaines

La dépression majeure est l’une des premières causes d’incapacité au travail dans le monde et a de nombreuses conséquences tant sur l’employé concerné qu’auprès des acteurs du milieu de travail.

ObjectifNous visons à documenter, selon la perspective des employeurs et des cadres des ressources humaines, les stratégies que ces acteurs préconisent dans leur organisation pour faciliter le retour au travail (RaT) d’employés en absence maladie due à une dépression.

MéthodeDeux cent dix-neuf employeurs et cadres de ressources humaines (n = 219) ont accepté de répondre à une entrevue semi-structurée téléphonique. La question abordée dans cet article était : « Selon vous, quelles sont les stratégies les plus efficaces pour aider un employé ayant reçu un diagnostic de dépression à retourner au travail ? » La codification duverbatima été effectuée à partir d’études empiriques et de théories existantes.

RésultatsTrente-quatre (34) stratégies réparties sur six grands principes ont émergé : 1) Contact avec l’employé en absence maladie (10 stratégies) ; 2) Évaluation et planification du RaT sans précipitation (6) ; 3) Formation des gestionnaires et du collectif de travail à la problématique de la santé mentale au travail (4) ; 4) Concertation des acteurs clés du RaT (4) ; 5) RaT progressif avec aménagements (4) ; 6) Suivi de la santé de l’employé et de son travail (6).

ConclusionCes principes articulés autour de 34 stratégies du RaT vont au-delà d’un processus étapiste de nature chronologique. Articulés dans un programme de RaT, ils devront être testés afin d’évaluer leurs retombées dans les organisations, notamment sur la gestion de l’incapacité au travail.

Consistency and sources of divergence in recommendations on screening with questionnaires for presently experienced health problems or symptoms: a comparison of recommendations from the Canadian Task Force on Preventive Health Care, UK National Screening Committee, and US Preventive Services Task Force

BACKGROUND

Recently, health screening recommendations have gone beyond screening for early-stage, asymptomatic disease to include "screening" for presently experienced health problems and symptoms using self-report questionnaires. We examined recommendations from three major national guideline organizations to determine the consistency of recommendations, identify sources of divergent recommendations, and determine if guideline organizations have identified any direct randomized controlled trial (RCT) evidence for the effectiveness of questionnaire-based screening.

METHODS

We reviewed recommendation statements listed by the Canadian Task Force on Preventive Health Care (CTFPHC), the United Kingdom National Screening Committee (UKNSC), and the United States Preventive Services Task Force (USPSTF) as of 5 September 2016. Eligible recommendations focused on using self-report questionnaires to identify patients with presently experienced health problems or symptoms. Within each recommendation and accompanying evidence review we identified screening RCTs.

RESULTS

We identified 22 separate recommendations on questionnaire-based screening, including three CTFPHC recommendations against screening, eight UKNSC recommendations against screening, four USPSTF recommendations in favor of screening (alcohol misuse, adolescent depression, adult depression, intimate partner violence), and seven USPSTF recommendations that did not recommend for or against screening. In the four cases where the USPSTF recommended screening, either the CTFPHC, the UKNSC, or both recommended against. When recommendations diverged, the USPSTF expressed confidence in benefits based on indirect evidence, evaluated potential harms as minimal, and did not consider cost or resource use. CTFPHC and UKNSC recommendations against screening, on the other hand, focused on the lack of direct evidence of benefit and raised concerns about harms to patients and resource use. Of six RCTs that directly evaluated screening interventions, five did not report any statistically significant primary or secondary health outcomes in favor of screening, and one trial reported equivocal results.

CONCLUSIONS

Only the USPSTF has made any recommendations for screening with questionnaires for presently experienced problems or symptoms. The CTFPHC and UKNSC recommended against screening in all of their recommendations. Differences in recommendations appear to reflect differences in willingness to assume benefit from indirect evidence and different approaches to assessing possible harms and resource consumption. There were no examples in any recommendations of RCTs with direct evidence of improved health outcomes.

Why is major depression prevalence not changing?

BACKGROUND

Increasing provision of treatment should theoretically lead to a decreased burden of major depressive episodes (MDE) in the population. However, there is no evidence yet that this has occurred. Among possible explanations are that: (1) treatment may not be sufficiently accessible, effective or effectively delivered to make a difference at the population level or (2) treatment benefits such as diminished episode duration may be offset by other trends such as increasing episode incidence, or vice versa.

METHODS

MDE prevalence has been assessed in a series of national surveys and in a single national longitudinal study in Canada. These studies included a short form version of the Composite International Diagnostic Interview module for major depression. Indicators of incidence and episode duration of MDE were estimated. Meta-regression methods were used to examine trends over time.

RESULTS

No evidence of increasing incidence nor of diminishing duration of MDE was found. The analysis failed to uncover evidence that the epidemiology of this condition has been changing.

LIMITATIONS

Most studies included in this analysis used an abbreviated interview for MDE which may lack sensitivity and/or specificity. These studies could not address potential benefits of treatment on prevention of suicide. Some potentially offsetting effects could not be assessed, e.g. economic or societal changes.

CONCLUSION

These results suggest that more effective efforts to prevent MDE, or to improve the volume or quality of treatment, are necessary to reduced burden of MDE in the population.

Association of comorbid psychopathology with the duration of cannabis use disorders

Risk factors for the development of cannabis use disorders (CUDs) have been well-researched. Comparatively little is known, however, about factors associated with the persistence of CUDs over time. This research explored whether the temporal sequencing of comorbid psychiatric disorders in relation to the onset of the index CUD episode were associated with the length of this episode. Four comprehensive diagnostic assessments were conducted between ages 16 and 30 with a large and regionally representative community sample (n = 816), among which 173 persons were diagnosed with a lifetime CUD. In separate unadjusted analyses, any internalizing disorder and any mood disorder with onset prior to that of the index CUD episode were each significantly and negatively associated with CUD duration. These effects, however, were reduced to trend level in adjusted analyses that controlled for putative confounders. Following the onset of the index CUD episode, the subsequent occurrence of any Axis I disorder, internalizing disorder, externalizing disorder, or other substance use disorder during the index CUD episode was significantly and positively associated with the duration of that episode in both unadjusted and adjusted analyses. These findings collectively suggest that the presence of internalizing-spectrum disorders prior to the onset of the index CUD episode affords some modest protection against protracted episodes, whereas the emergence of broad-spectrum psychopathology within the index CUD episode, most notably noncannabis substance use disorders, is associated with greater disorder persistence. The relevance of these findings for various motivational models of cannabis addiction is discussed.

Major depressive disorder: reification and (maybe) rheostasis

The heterogeneity of clinical syndromes subsumed by diagnostic criteria for major depressive disorder (MDD) is regarded by some as a reason to abandon or modify the criteria. However, heterogeneity may be unavoidable because of the biopsychosocial complexity of depression. MDD may be characterised by complexities that cannot be distilled down to any brief set of diagnostic criteria. Psychiatrists and psychiatric epidemiologists may need to revise their expectations of this diagnosis in order to avoid over-estimating its ability to guide the selection of treatments and prediction of prognosis. An opposing perspective is that of reification, in which the diagnosis is viewed as being more real than it really is. The concept of rheostasis may help to explain some features of this condition, such as why major depressive episodes sometimes seem understandable or even adaptive (e.g. in the context of bereavement) whereas at other times such episodes are inexplicable and maladaptive.

Major depression diagnoses among patients with systemic sclerosis: baseline and one-month followup

OBJECTIVE

Depression is common in many rheumatic diseases and is associated with poor prognosis. No studies of patients with any rheumatic diseases, however, have assessed the stability of major depressive disorder (MDD) diagnoses over time. The objective of the present study was to assess the stability of MDD diagnoses among patients with systemic sclerosis (SSc; scleroderma), a rare autoimmune rheumatic disease, across 2 assessments approximately 1 month apart.

METHODS

SSc patients were recruited from 7 Canadian Scleroderma Research Group Registry sites (April 2009 to June 2012). Current (30-day) MDD was assessed with the Composite International Diagnostic Interview at baseline and approximately 1 month later.

RESULTS

Among 309 patients with baseline assessments who received followup assessments an average of 34 days later, prevalence of 30-day MDD was 4% (95% confidence interval [95% CI] 2%-7%; n = 12) at baseline and 5% (95% CI 3%-8%; n = 16) at followup. Only 3 of 12 patients (25% [95% CI 9%-53%]) with MDD at baseline had MDD 1 month later.

CONCLUSION

Most patients with SSc who meet criteria for MDD appear to experience mild, time-limited episodes of low mood that often resolve on their own without specific treatment. Consistent with international guidelines on depression management in nonpsychiatric settings, "watchful waiting" or "active monitoring" is a good strategy for SSc patients with mild depression to avoid unnecessary treatment among those whose symptoms may be transient and may resolve without medical intervention.

Time and the psychiatric interview: The negotiation of temporal criteria of the depressive disorder

In this article, I am concerned with doctors’ negotiations of the temporal dimension of the diagnostic criteria of depressive disorders during the first psychiatric interview. The data come from 16 initial psychiatric interviews recorded by doctors in three psychiatric hospitals in Poland. Taking a constructionist view of discourse and psychiatric practices, I shall argue that the discursive practice related to temporal information about patients’ illnesses serves in gaining information, which is useful in the medical model of psychiatric diagnosis. The doctors positioned the patients’ experiences on the timeline when the illness history was taken and temporal information authenticated the information. Conversely, the patients’ current conditions were constructed in a limitless present, which allowed the psychiatrists to remove the relativity.

Early cognitive behavioral therapy for depression after cardiac surgery

BACKGROUND

Despite high rates of postcardiac surgery depression, studies of depression treatment in this population have been limited.

OBJECTIVE

The aim of this study was to evaluate early cognitive behavioral therapy (CBT) in a home environment in patients recovering from cardiac surgery.

METHODS

: From July 2006 through October 2009, we conducted a randomized controlled trial and enrolled 808 patients who were screened for depressive symptoms using the Beck Depression Inventory (BDI) in the hospital and 1 month later. Patients were interviewed using the Structured Clinical Interview for DSM-IV; those who met criteria for clinical depression (n = 81) were randomized to CBT (n = 45) or usual care (UC; n = 36). After completion of the UC period, 25 individuals were offered later CBT (UC + CBT).

RESULTS

Main outcomes (depressive symptoms [BDI] and clinical depression [Structured Clinical Interview for DSM-IV]) were evaluated after 8 weeks using intention-to-treat principles and linear mixed models. Compared with the UC group, in the CBT group, there was greater decline in BDI scores (β = 1.41; 95% confidence interval [CI], 0.81-2.02; P = < .001) and greater remission of clinical depression (29 [64%] vs 9 [25%]; number need to treat, 2.5; 95% CI, 1.7-4.9; P < .001). Compared with the early CBT group (median time from surgery to CBT, 45.5 days) the later UC + CBT group (median time from surgery to CBT, 122 days) also experienced a reduction in BDI scores, but the group × time effect was smaller (β = 0.79; 95% CI, 0.10-1.47; P = .03) and remission rates between the 2 groups did not differ.

CONCLUSIONS

Early home CBT is effective in depressed postcardiac surgery patients. Early treatment is associated with greater symptom reduction than similar therapy given later after surgery.

Modeling the risks and benefits of depression treatment for children and young adults

OBJECTIVES

To quantify the trade-offs of alternative strategies in treating pediatric major depressive disorder with respect to the clinical benefit and risk of fatal and nonfatal suicidal behavior over a 5-year time horizon.

METHODS

We developed a disease simulation model integrating epidemiological and clinical data from the literature to simulate the effect of selective serotonin reuptake inhibitors (SSRIs), cognitive behavioral therapy (CBT), and a combination of both on a US pediatric population with major depressive disorder.

RESULTS

In a cohort of 1,000,000 simulated individuals (ages 10-24 years), the use of SSRIs was associated with the highest number of suicide-related events, while CBT was associated with the lowest number. Over a 5-year period, the strategy with the highest number of symptom-free weeks depended on assumptions made regarding treatment efficacy beyond the available clinical data.

CONCLUSIONS

Considering the risk-benefit profile over a 5-year period, CBT offers a safer profile than combination treatment or SSRIs alone with respect to suicide deaths and attempts. Any additional benefits of SSRIs, either alone or in combination with CBT, must be weighed against the expected increase in suicides.

Problems encountered with the use of simulation in an attempt to enhance interpretation of a secondary data source in epidemiologic mental health research

Background

The longitudinal epidemiology of major depressive episodes (MDE) is poorly characterized in most countries. Some potentially relevant data sources may be underutilized because they are not conducive to estimating the most salient epidemiologic parameters. An available data source in Canada provides estimates that are potentially valuable, but that are difficult to apply in clinical or public health practice. For example, weeks depressed in the past year is assessed in this data source whereas episode duration would be of more interest. The goal of this project was to derive, using simulation, more readily interpretable parameter values from the available data.

Findings

The data source was a Canadian longitudinal study called the National Population Health Survey (NPHS). A simulation model representing the course of depressive episodes was used to reshape estimates deriving from binary and ordinal logistic models (fit to the NPHS data) into equations more capable of informing clinical and public health decisions. Discrete event simulation was used for this purpose. Whereas the intention was to clarify a complex epidemiology, the models themselves needed to become excessively complex in order to provide an accurate description of the data.

Conclusions

Simulation methods are useful in circumstances where a representation of a real-world system has practical value. In this particular scenario, the usefulness of simulation was limited both by problems with the data source and by inherent complexity of the underlying epidemiology.

Duration of untreated illness and antidepressant fluvoxamine response in major depressive disorder

AIMS

The aim of this study was to analyze the relation between treatment response and the duration of untreated illness (DUI) in 133 outpatients with the first major depressive disorder (MDD) episode.

METHODS

A logistic regression was performed with DUI, sex, age at onset, and score for 17 items on the Hamilton Depression Rating Scale at the time of start of fluvoxamine treatment as the explanatory variables, and the response and the remission as the outcome variables.

RESULTS

Regression analysis showed significant association between the response and DUI (P < 0.0001), and between the remission and DUI (P < 0.0001), respectively. The remission rate gradually decreased with longer DUI.

CONCLUSION

Early treatment of first depressive episodes is important because a shorter DUI implied better remission outcomes.

The emerging modern face of mood disorders: a didactic editorial with a detailed presentation of data and definitions

The present work represents a detailed description of our current understanding and knowledge of the epidemiology, etiopathogenesis and clinical manifestations of mood disorders, their comorbidity and overlap, and the effect of variables such as gender and age. This review article is largely based on the 'Mood disorders' chapter of the Wikibooks Textbook of Psychiatry http://en.wikibooks.org/wiki/Textbook_of_Psychiatry/Mood_Disorders.

Canadian Network for Mood and Anxiety Treatments (CANMAT) clinical guidelines for the management of major depressive disorder in adults. I. Classification, burden and principles of management

BACKGROUND

Major depressive disorder (MDD) is one of the most burdensome illnesses in Canada. The purpose of this introductory section of the 2009 revised CANMAT guidelines is to provide definitions of the depressive disorders (with an emphasis on MDD), summarize Canadian data concerning their epidemiology and describe overarching principles of managing these conditions. This section on "Classification, Burden and Principles of Management" is one of 5 guideline articles in the 2009 CANMAT guidelines.

METHODS

The CANMAT guidelines are based on a question-answer format to enhance accessibility to clinicians. An evidence-based format was used with updated systematic reviews of the literature and recommendations were graded according to the Level of Evidence using pre-defined criteria. Lines of Treatment were identified based on criteria that included evidence and expert clinical support.

RESULTS

Epidemiologic data indicate that MDD afflicts 11% of Canadians at some time in their lives, and approximately 4% during any given year. MDD has a detrimental impact on overall health, role functioning and quality of life. Detection of MDD, accurate diagnosis and provision of evidence-based treatment are challenging tasks for both clinicians and for the health systems in which they work.

LIMITATIONS

Epidemiologic and clinical data cannot be seamlessly linked due to heterogeneity of syndromes within the population.

CONCLUSIONS

In the eight years since the last CANMAT Guidelines for Treatment of Depressive Disorders were published, progress has been made in understanding the epidemiology and treatment of these disorders. Evidence supporting specific therapeutic interventions is summarized and evaluated in subsequent sections.

The evolving understanding of major depression epidemiology: implications for practice and policy

OBJECTIVES

Epidemiologic studies have confirmed that major depression (MD) is an extremely common condition, but also one that is associated with an unexpectedly broad spectrum of morbidity. It is no longer a tenable position to regard MD as being a simple indicator of treatment need, nor is a one-size-fits-all approach to treatment likely to be an effective guide to health care delivery. The objective of this commentary is to explore the implications of these new epidemiologic findings for policy and practice in Canada.

METHOD

This paper is a selective review and commentary.

RESULTS

Whereas the acute and long-term treatment needs of a subset of individuals with MD have received much attention in the literature, the needs of other groups have not. A sizable proportion of individuals with episodes meeting the Diagnostic and Statistical Manual of Mental Disorders-fourth edition definition in community populations may not need the intensive treatment emphasized by current Canadian practice guidelines. The strategy of watchful waiting may have a role in primary care. On the policy front, guided and perhaps self-guided management strategies deserve greater emphasis than they have received. Stepped-care strategies are an appealing option, but how best to effectively implement these in the Canadian context is unclear.

CONCLUSIONS

The spectrum of morbidity among individuals with MD in community populations is much wider than has been previously appreciated. The health system should respond with an appropriate spectrum of services, but many questions remain about how to facilitate this.

An animated depiction of major depression epidemiology

BACKGROUND

Epidemiologic estimates are now available for a variety of parameters related to major depression epidemiology (incidence, prevalence, etc.). These estimates are potentially useful for policy and planning purposes, but it is first necessary that they be synthesized into a coherent picture of the epidemiology of the condition. Several attempts to do so have been made using mathematical modeling procedures. However, this information is not easy to communicate to users of epidemiological data (clinicians, administrators, policy makers).

METHODS

In this study, up-to-date data on major depression epidemiology were integrated using a discrete event simulation model. The mathematical model was animated in Virtual Reality Modeling Language (VRML) to create a visual, rather than mathematical, depiction of the epidemiology.

RESULTS

Consistent with existing literature, the model highlights potential advantages of population health strategies that emphasize access to effective long-term treatment. The paper contains a web-link to the animation.

CONCLUSION

Visual animation of epidemiological results may be an effective knowledge translation tool. In clinical practice, such animations could potentially assist with patient education and enhanced long-term compliance.