Screening for depression in elderly primary care patients. A comparison of the Center for Epidemiologic Studies-Depression Scale and the Geriatric Depression Scale.

BACKGROUND: Later-life depressive disorders are a major public health problem in primary care settings. A validated screening instrument might aid in the recognition of depression. However, available findings from younger patients may not generalize to older persons, and existing studies of screening instruments in older patient samples have suffered substantial methodological limitations. METHODS: One hundred thirty patients 60 years or older attending 3 primary care internists' practices participated in the study. Two screening scales were used: the Center for Epidemiologic Studies-Depression Scale (CES-D) and the Geriatric Depression Scale (GDS). The Structured Clinical Interview for the Diagnostic and Statistical Manual of Mental Disorders. Third Edition, Revised, was used to establish "gold standard" diagnoses including major and minor depressive disorders. Receiver operating curve analysis was used to determine each scale's operating characteristics. RESULTS: Both the CES-D and the GDS had excellent properties in screening for major depression. The optimum cutoff point for the CES-D was 21, yielding a sensitivity of 92% and a specificity of 87%. The optimum cutoff point for the GDS was 10, yielding a sensitivity of 100% and a specificity of 84%. A shorter version of the GDS had a sensitivity of 92% and a specificity of 81% using a cutoff point of 5. All scales lost accuracy when used to detect minor depression or the presence of any depressive diagnosis. CONCLUSIONS: The CES-D and the GDS have excellent properties for use as screening instruments for major depression in older primary care patients. Because the GDS's yes or no format may ease administration, primary care clinicians should consider its routine use in their practices.

Depression and self-reported functional status in older primary care patients.

OBJECTIVE: The authors' goal was to examine whether depression is associated with overreporting of functional disability. METHOD: The subjects were 304 patients 60 years old or older who were recruited from primary care settings. Measures included examiner ratings of depression diagnosis and medical burden and self-reported and examiner-rated functional assessments. Multiple regression techniques were used to determine the independent association of depression with self-reported function after examiner-rated function was added to the analysis as a covariate. RESULTS: Depression diagnosis was associated with poorer self-reported role functioning, whether the patient attributed the disability to physical or emotional causes. Depression was not independently associated with poorer self-reported physical functioning. CONCLUSIONS: Clinicians and researchers should recognize that depression can confound the self-reporting and attribution of functional disability.

Cerebrovascular risk factors and 1-year depression outcome in older primary care patients.

OBJECTIVE: A model in which cerebrovascular disease contributes to the pathogenesis of depression in later life was the basis of the authors' hypothesis that cerebrovascular risk factors at intake are independently associated with depression at 1-year follow-up. METHOD: The subjects were 247 patients aged 60 years or older in primary care practices. The study measures were completed at intake and 1-year follow-up. Multiple regression techniques were used to determine the independent association of initial cerebrovascular risk factors with depressive symptoms and diagnoses at 1 year. RESULTS: The authors found that the severity of initial cumulative cerebrovascular risk factors was significantly independently associated with 1-year depressive symptoms and diagnoses, but not after also controlling for overall medical burden. CONCLUSIONS: The results lend some support to the cerebrovascular model of depression.

Medical illness burden, trait neuroticism, and depression in older primary care patients.

OBJECTIVE: The authors tested the hypotheses that medical illness burden is independently associated with depression and that this association is moderated by neuroticism. METHOD: Multiple regression techniques were used to determine the independent associations of medical burden and neuroticism with depression in a group of 196 subjects, 60 years of age and older, recruited from primary care settings. RESULTS: Medical burden and neuroticism were independently associated with major depression, depressive symptoms, and psychiatric dysfunction. CONCLUSIONS: These findings support models in which medical disorders may contribute directly to depression. At the same time, the role of neuroticism in later-life depression warrants further study.

Depressive symptoms, medical illness, and functional status in depressed psychiatric inpatients.

OBJECTIVE: There is evidence that both psychiatric (especially affective) and medical illnesses contribute to physical disability. However, the differential contributions of specific psychiatric disorders and of medical pathology to functional status in psychiatric populations have not been studied. The authors therefore examined the contributions of depressive symptoms and medical illness to functional disability in depressed inpatients. METHOD: This prospective investigation included 109 psychiatric inpatients with DSM-III-R major depression. Regression techniques were used to examine the contribution of demographic variables (age, sex, education), depressive symptom severity (Hamilton Rating Scale for Depression score), psychiatric function (Global Assessment of Functioning Scale score), organ system pathology (Cumulative Illness Rating Scale score), and medical disability (Karnofsky Performance Status Scale score) to overall functional status (Instrumental Activities of Daily Living and Physical Self-Maintenance scores). These relationships were also examined in older and younger subgroups. RESULTS: Greater age, female sex, and illness factors all contributed to poorer functional status. Of the illness factors, psychiatric pathology contributed more to low functional status than did medical illness. The predictive power came specifically from the functionally based measures of psychiatric and medical illness; a quantitative measure of symptoms (Hamilton depression scale) or organ pathology (Cumulative Illness Rating Scale) did not significantly predict overall functional status. CONCLUSIONS: Clinicians and researchers should recognize that symptomatic and functional assessments tap related but different domains and that both psychiatric and medical illnesses contribute to overall disability.

Delirium: masquerades and misdiagnosis in elderly inpatients.

Delirium is an organic mental disorder defined as transient, fluctuating global dysfunction of cognition. It is common in elderly medical inpatients, yet its varied presentation is often missed or misdiagnosed.

Suicide attempts in elderly psychiatric inpatients.

OBJECTIVE: To describe the psychopathological characteristics of elderly suicide attempters admitted to an inpatient psychiatric unit. DESIGN: Retrospective chart review. PATIENTS: All 168 patients age 60 years and over treated on the adult psychiatric inpatient unit of Yale-New Haven Hospital from 1979 to 1984. Twenty-five made a suicide attempt. MAIN OUTCOME MEASURES: Presence and severity of suicide attempts were rated and compared with demographic, clinical, and functional data. RESULTS: (1) Eighty percent of the attempters had a major depressive syndrome; (2) among patients with affective disorders, presence of an attempt was significantly associated with a later age of onset; (3) patients who had made more severe attempts were more likely to be diagnosed as psychotic depression, although this trend was not significant; (4) substance abuse and dementia were uncommon diagnoses; (5) symptomatic and functional outcome of hospitalization was as favorable for the attempters as for the entire elderly cohort. CONCLUSIONS: Affective illness, especially late-onset major depression, was the major association with suicide attempts.

Completed suicide among older patients in primary care practices: a controlled study.

OBJECTIVE: To determine whether physical and psychiatric illness, functional status, and treatment history distinguish older primary care patients who committed suicide from those who did not. DESIGN: A case-control study using data collected by psychological autopsies of suicides and prospective patient interviews for controls. SETTING: Primary care practices in Monroe County, NY. PARTICIPANTS: Forty-two suicides aged 60 years and older who visited a primary care provider within 30 days of death and 196 patients aged 60 years and older from a group practice of general internal medicine (n = 115) or family medicine (n = 81). MEASUREMENTS: Psychiatric diagnosis; depressive symptom severity; physical health and function; psychiatric treatment history. RESULTS: Completed suicides had more depressive illness (P = .001), physical illness burden (P = .0002), and functional limitations (P = .0001) than controls and were more likely to be prescribed antidepressants (P = .004), anxiolytic agents (P = .0001), and narcotic analgesics (P = .022). Among depressed subjects, affective symptom severity (P< .0001) and emotional dysfunction (P<.0001) distinguished suicide completers. However, physical health, overall function, and treatments received did not differ between groups. CONCLUSIONS: The primary care setting is an important venue for late life suicide prevention. Primary care providers should be well prepared to diagnose and treat depression in their older patients. Additional research is needed concerning the interactions of physical health, functional status, and depressive symptoms in determining suicide risk.

Older age and the underreporting of depressive symptoms.

OBJECTIVE: To determine whether older age is associated with a decrease in self-reported depressive symptoms, independent of examiner-rated symptoms, in inpatients with major depression. DESIGN: Survey study. SETTING: Inpatient psychiatric units at a university medical center. PATIENTS: Eligible subjects were those over 20 years of age with a primary diagnosis of DSM-III-R major depression. Participation was sought from all subjects over 60 years of age and from every second or every third younger subject, depending on rater availability. Of 137 eligible subjects, 97 completed all study measures. MEASUREMENTS: The Beck Depression Inventory (BDI), as a measure of self-reported depressive symptoms, was the dependent variable. The Hamilton Rating Scale for Depression (Ham-D) was used to assess examiner-rated symptoms. MAIN RESULTS: Older age (P = .03) was associated negatively and examiner-rated depressive symptoms (P = .0001) were associated positively with BDI score. Other variables, including gender, education, age of depression onset, and medical illness burden, were not independently associated with BDI. Examination of depressive symptom subtotals (psychologic/affective vs. somatic/neurovegetative) revealed that only the self-reported psychologic/affective subtotal was significantly associated with age (P = .0018). CONCLUSIONS: Some older patients with clinically significant depression underreport their symptoms. When asking older patients about depressive symptoms, clinicians should view negative responses only within larger clinical contexts and should obtain information from other sources as needed. Similar concerns must temper interpretation of research that relies on subject self-report to study depression in late life.

The importance of subsyndromal depression in older primary care patients: prevalence and associated functional disability.

OBJECTIVE: Existing diagnostic categories for depression may not encompass the majority of older people suffering clinically significant depressive symptoms. We have described the prevalence of subsyndromal depressive symptoms and tested the hypothesis that patients with subsyndromal depression have greater functional disability and general medical burden than nondepressed subjects but less than patients with diagnosable depressions. METHODS: Subjects were 224 patients, aged 60 years and older, recruited from private internal medicine offices or a family medicine clinic. Validated measures of psychopathology, medical burden, and functional status were used. The subsyndromal depression group was defined by a score of more than 10 on the Hamilton Rating Scale for Depression and by the absence of major or minor depressive disorder. Analyses included multiple regression techniques to determine the presence of group differences adjusted for demographic covariates. RESULTS: Subsyndromal depression was common (estimated point prevalence of 9.9% compared with 6.5% for major depression, 5.2% for minor depression, and .9% for dysthymic disorder), associated with functional disability and medical comorbidity to a degree similar to major or minor depression, and often treated with antidepressant medications. CONCLUSIONS: Although depressive conditions are common and are associated with considerable functional and medical morbidity in older primary care patients, many patients with clinically significant depressive symptoms are not captured by criteria-based syndromic diagnostic categories. Future work should include intervention studies of subsyndromally depressed older persons as well as attention to the course and biopsychosocial concomitants of diagnosable and subsyndromal depressions in this population.

Depression and medical illness in late life: report of a symposium.

The high comorbidity of medical illnesses and late life depression poses both challenges and opportunities. Challenges in assessment techniques, diagnosis, and specific prognosis affect clinical care and research methodology alike. However, investigations that turn this vexing "confound" into research questions may prove fruitful. For clinicians working with older persons, recognizing the prognostic import of comorbid medical illnesses in late-life depression is essential to treatment planning. This comorbidity also poses difficulties in diagnosing depression inasmuch as symptoms of the medical conditions may overlap with those of an affective disorder. Symptom assessments must strike a balance between overly inclusive (e.g., mistakenly treating the psychomotor slowing of Parkinson's disease as depression) and overly exclusive (e.g., erroneously dismissing the patient's mood symptoms as "understandable"). Clinicians also should be sensitive to the broad range of symptomatic presentations with varying severities of both mood and medical disorders, as exemplified by variability across treatment settings. For researchers, similar issues are of relevance in planning investigative strategies. Consideration should be given to the following: 1. Case identification is a crucial first step; the approach to depressive symptoms potentially confounded by medical illnesses must be defined explicitly. Choice of an inclusive approach avoids premature exclusion of relevant phenomena; exploratory analyses can examine the effects of other approaches to the relationships of interest. 2. The use of similar research instruments across sample sites would greatly facilitate comparisons of results. Each subject group offers its own "leverage" for answering particular questions. Psychiatric inpatients will highlight the contributions of severe psychopathology (useful, for example, in identifying biologic markers). Medical inpatients are well suited to studies examining validity of different approaches to case identification, investigating health service utilization, or highlighting the contribution of acute, severe, life-threatening medical disorders to affective illness. Long-term care residents lend themselves to issues that benefit from compression of health processes over time. Medical outpatients have many advantages regarding generalizability and public health significance. Community samples are needed to determine the biases of all the above groups, which are each defined by service utilization. 3. Study of the relationships between depression and medical illness may further understanding of pathogenic mechanisms in late life mood disorders. Research questions might be guided by the biopsychosocial conceptual context described above. On the one hand, this context demands multidimensional study methodology to identify the routes by which medical illness influences depression in particular patient groups. Multivariate models should examine direct and indirect effects of medical illness on depression while, at the same time, considering intervening variables such as functional disability, personality, and social support. Guided multiple regressions or structural equation modeling will allow for determination of strengths of associations. 4. At the same time, and of particular importance if complex multivariate analyses are used, specific theoretic models should help direct focused investigations. The development and testing of such models is a major challenge that should be addressed by current research. Finally, from a societal perspective, the comorbidity of depression and medical illness likely has a tremendous impact on both health and health care delivery for older adults. Further study is needed to identify more specific approaches to treatment. Yet existing data clearly support a policy of routine psychiatric assessment of older people in general medical settings...

Ruminative thinking in older inpatients with major depression.

Ruminative thinking, the tendency to dwell on particular ideas or themes, can be a prominent part of the phenomenology of major depression, but it rarely has been the focus of empirical research. We attempted to replicate (in adult psychiatric inpatients age > or = 50 years with DSM-III-R major depression) the previously published finding that ruminative thinking was associated with melancholia and with psychosis. In our sample, these associations were not present. In addition, we explored the relationships of ruminative thinking to specific areas of thought content (e.g., suicidal ideation, somatic worry), cognitive function and overall functional status; ruminative thinking was not associated with suicidal ideation, but was associated with greater somatic worry and with poorer functional status, although these associations were not independent of overall depressive severity. A substantial proportion of subjects were unable to complete the cognitive measures; ruminative thinking was independently associated with inability to complete these tasks. We conclude that ruminative thinking is a meaningful and common clinical phenomenon among severely depressed older inpatients. Further investigations in inpatients and other populations examining its relationships to other phenomenology, to course and outcome, and to putative underlying mechanisms of depression are warranted.

Profile of discrete emotions in affective disorders in older primary care patients.

PURPOSE: This research examined whether the frequencies of specific emotions are associated with major and minor depression in older primary care patients. DESIGN AND METHODS: Older primary care patients (N = 146), prescreened with a depression questionnaire, completed a diagnostic interview and an emotions questionnaire. RESULTS: Controlling for age, sex, and other psychiatric and medical illnesses, major depressives differed from nondepressed controls in nine emotions; minor depressives differed from controls in four emotions. Major depressives differed from the controls more in sadness, joy, and interest--but not anger, fear, or guilt--than in comparison sets of emotions. Minor depressives differed from the controls more in sadness and inner-directed hostility--but not guilt, anger, fear, joy, or interest--than in comparison sets of emotions. IMPLICATIONS: The frequencies of discrete emotions are differentially associated with major and minor depression; future research is needed to determine their specific diagnostic and treatment implications.

Severity of depression and anxiety are predictors of response to antidepressant treatment in Parkinson's disease.

BACKGROUND: Antidepressants have appeared to be more effective than placebo treatment in treating depressive syndromes in patients with Parkinson's disease (PD). OBJECTIVE: To identify factors that predict improvement in depressive symptoms during antidepressant treatment in depressed PD patients. METHODS: A secondary analysis was performed on the dataset of the Randomized Placebo-controlled Study of Antidepressants in PD (SAD-PD), in which 76 patients received active treatment with either paroxetine or venlafaxine extended release (XR), and 39 patients received placebo treatment. Backward stepwise regression analyses were conducted with change in 24-item Hamilton Depression Rating Scale (HAMD-24) score between assessments at baseline and week 12 as the main outcome measure, and sex, age, baseline HAMD-24 score, Unified Parkinson's Disease Rating Scale section III (UPDRS-III) score, Mini-Mental State Examination (MMSE), and the Clinical Anxiety Scale (CAS) as independent variables. RESULTS: In both the active treatment and placebo groups, higher baseline HAMD-24 score and lower UPDRS-III score were associated with greater reduction in HAMD-24 score. Higher anxiety scores predicted less response in the active treatment group. Higher MMSE scores predicted greater response only in the placebo-treated group. Sex and age were no predictors of response. CONCLUSIONS: Higher pre-treatment depression scores and lower pre-treatment anxiety scores are the two most important predictors for improvement during antidepressant treatment in depressed PD patients, which is in line with those found in treatment studies of depressed non-PD patients. Furthermore, our results indicate the requirement for different or more intensive treatment for depressed PD patients with more severe anxiety symptoms.

A randomized, double-blind, placebo-controlled trial of antidepressants in Parkinson disease.

OBJECTIVE: To evaluate the efficacy and safety of a selective serotonin reuptake inhibitor (SSRI) and a serotonin and norepinephrine reuptake inhibitor (SNRI) in the treatment of depression in Parkinson disease (PD). METHODS: A total of 115 subjects with PD were enrolled at 20 sites. Subjects were randomized to receive an SSRI (paroxetine; n = 42), an SNRI (venlafaxine extended release [XR]; n = 34), or placebo (n = 39). Subjects met DSM-IV criteria for a depressive disorder, or operationally defined subsyndromal depression, and scored >12 on the first 17 items of the Hamilton Rating Scale for Depression (HAM-D). Subjects were followed for 12 weeks (6-week dosage adjustment, 6-week maintenance). Maximum daily dosages were 40 mg for paroxetine and 225 mg for venlafaxine XR. The primary outcome measure was change in the HAM-D score from baseline to week 12. RESULTS: Treatment effects (relative to placebo), expressed as mean 12-week reductions in HAM-D score, were 6.2 points (97.5% confidence interval [CI] 2.2 to 10.3, p = 0.0007) in the paroxetine group and 4.2 points (97.5% CI 0.1 to 8.4, p = 0.02) in the venlafaxine XR group. No treatment effects were seen on motor function. CONCLUSIONS: Both paroxetine and venlafaxine XR significantly improved depression in subjects with PD. Both medications were generally safe and well tolerated and did not worsen motor function. CLASSIFICATION OF EVIDENCE: This study provides Class I evidence that paroxetine and venlafaxine XR are effective in treating depression in patients with PD.

Effects of psychotherapy and other behavioral interventions on clinically depressed older adults: a meta-analysis.

OBJECTIVES: The goal of the present study was to assess the effects of psychotherapy and other behavioral interventions on depressive symptoms in clinically depressed older patients. METHODS: We used meta-analysis to examine the effects of 57 controlled intervention studies. RESULTS: On average, self-rated depression improved by d=0.84 standard deviation units and clinician-rated depression improved by d=0.93. Effect sizes were large for cognitive and behavioral therapy (CBT) and reminiscence; and medium for psychodynamic therapy, psychoeducation, physical exercise and supportive interventions. Age differences in treatment effects were not observed. Weaker effects were found in studies that used an active control group and in studies of physically ill or cognitively impaired patients. Studies of samples comprised exclusively of patients suffering from major depression (versus other mood disorders) also yielded weaker intervention effects. On average, 18.9% of participants did not complete the intervention, with higher dropout rates reported in group (versus individual) interventions and in longer interventions. CONCLUSIONS: We conclude that cognitive-behavioral therapy and reminiscence are particularly well-established and acceptable forms of depression treatment. Interventions with 7-12 sessions may optimize effectiveness while minimizing dropout rates. For physically and cognitively impaired patients, modifications in treatment format and/or content might be useful, such as combining psychotherapy with social work interventions and pharmacotherapy.

Religious involvement and depressive symptoms in primary care elders.

BACKGROUND: Multiple lines of evidence indicate relationships between religious involvement and depression, although the specific nature of the relationships is yet to be clarified. Moreover, there appear to be no well controlled longitudinal studies to date examining this issue in primary care elders. METHOD: The authors assessed the linear and non-linear relationships between three commonly identified types of religious involvement and observer-rated depressive symptoms in 709 primary care elders assessed at baseline and 1-year follow-up. RESULTS: Cross-sectional analyses revealed a curvilinear, U-shaped association between depressive symptoms and organizational religious activity, an inverse linear relationship of depressive symptoms with private religious involvement, and a positive relationship of depressive symptoms with intrinsic religiosity. Longitudinal analyses revealed a U-shaped association between depressive symptoms and private religious involvement, such that those reporting moderate levels of private religiosity at baseline evidenced lower levels of depressive symptoms at 1-year follow-up than those reporting either high or low levels of private religious activity. CONCLUSIONS: The relationships between religious involvement and depression in primary care elders are complex and dependent on the type of religiosity measured. The authors found the strongest evidence for an association of non-organizational, private religious involvement and the severity of depressive symptoms, although further study is warranted using carefully controlled longitudinal designs that test for both linear and curvilinear relationships.

Stress, medical illness, and depression.

In this review, we present potential pathways through which medical illness may act as a stress-related catalyst of major depression. We will consider available evidence and discuss biological, psychological, and psychosocial theories, individually and in their interplay, in an attempt to better understand the potential roles of stress in mediating the relationships between medical illness and mood disorder. We will use the specific example of major depression occurring after acute myocardial infarction to illustrate the application of our theoretical framework.

Late-life suicide and depression in the primary care setting.

Late-life depression and suicidal behavior in the primary care setting is a significant public health concern. The prevalence of depression in this population is substantial, yet rates of detection and treatment are far from adequate. Untreated depression has significant consequences with regard to morbidity and mortality. Although suicide is a relatively low-base-rate behavior, a substantial proportion of late-life suicides have contact with their primary care provider prior to their death; thus this offers an avenue for suicide prevention. There is a growing knowledge base concerning what constitutes barriers to the recognition and treatment of late-life depression as well as what constitutes useful screening tools and treatments for the depressed elderly. Important new findings with regard to the functional effects of subsyndromal depression, possible subtypes of late-life depression, the clinical utility of SSRIs and psychotherapeutic interventions, and innovative and collaborative models of care hold promise for advancing the science and practice of treating late-life depression.

Age at Onset or Late-Life Depression: A Research Agenda Report of a MacArthur Foundation-NIMH Workshop.

A workshop titled "Age of Onset in Late-Life Depression" was cosponsored by the MacArthur Foundation Research Network on the Psychobiology of Depression and NIMH in November 1992. The purpose was to better define the relevant methodological and conceptual issues regarding age-at-onset research and to address the ways in which age at onset might more fruitfully inform progress in understanding and treating late-life depression. This paper summarizes the workshop and includes consensus recommendations for future investigation.