Methodology of Treatment Studies in Geriatric Depression

Does psychological distress vary between younger and older adults in health and disease?

OBJECTIVE

The effect of age on psychological distress remains controversial and it is unclear how a chronic medical illness influences this association. We aimed to compare the level of psychological distress between younger and older patients with chronic medical conditions attending hospital specialty clinics and to test whether a different pattern emerges when comparisons with individuals without long-term conditions are made.

METHODS

In 519 individuals without chronic medical conditions and 949 patients with established severe chronic medical illnesses, we compared psychological distress (GHQ-28 and SCL-90R) between younger (<65, N=1040) and older (≥65, N=428) participants after controlling for gender, marital status, education and primary diagnosis in multiple logistic regression models.

RESULTS

Among the healthy participants, a greater proportion of older individuals presented mild/moderate psychological distress (p=.026), predominantly depressive and somatization symptoms. Among the medical patients, both age groups presented elevated levels of psychological distress, but a greater proportion of younger patients had severe psychological distress (p=.016), predominantly depressive, anxiety and hostility symptoms. Younger patients reported similarly high levels of somatization symptoms compared to older patients. The odds of being assessed with severe psychological distress were significantly greater for younger individuals with physical illnesses, independently of gender, marital status, education and primary diagnosis.

CONCLUSIONS

Medical patients from both age groups had significant psychological distress symptoms scores. Younger patients with chronic medical illnesses were more vulnerable to severe psychological distress, including symptoms of anxiety, depression, hostility and somatization. Therefore, clinicians should direct efforts to recognize these symptoms in order to prevent further functional impairment.

Anterior cingulate dysfunction in geriatric depression

BACKGROUND

Although several brain abnormalities have been identified in geriatric depression, their relationship to the pathophysiological mechanisms leading to the development and perpetuation of this syndrome remain unclear.

METHODS

This paper reviews findings on the anterior cingulate cortex (ACC) function and on the relationship of ACC abnormalities to the clinical presentation and the course of geriatric depression in order to elucidate the pathophysiological role of ACC in this disorder.

RESULTS

The ACC is responsible for conflict detection and emotional evaluation of error and is connected to brain structures that regulate mood, emotional valence of thought and autonomic and visceral responses, which are functions disturbed in depression. Geriatric depression often is accompanied by abnormalities in some executive functions and has a clinical presentation consistent with ACC abnormalities. Indices of ACC dysfunction are associated with adverse outcomes of geriatric depression.

CONCLUSIONS

Converging findings suggest that at least some ACC functions are abnormal in depression and these abnormalities are pathophysiologically meaningful. Indices of ACC dysfunction may be used to identify subgroups of depressed elderly patients with distinct illness course and treatment needs and serve as the theoretical background for novel treatment development.

Increased risk of developing stroke for patients with major affective disorder--a registry study

Only a few studies have evaluated depressive disorder as a risk factor for cerebrovascular disease. In a hospital discharge register with nation-wide coverage of all hospitals in Denmark we used linkage between the somatic and psychiatric registries to study comorbidity between affective disorders and cerebrovascular diseases in hospitalised patients. The main finding of this study was that patients with depression severe enough to be hospitalised, seem to be at an increased risk of developing cerebrovascular disease. The hazard ratio of getting a diagnosis of stroke after initially having been discharged with a diagnosis of depression was found to be 1.22 (95% Confidence Interval: 1.06-1.41). In the group of patients with manic/bipolar disorder no association was found concerning development of stroke. In elderly with first time depression admitted to hospital, neurological disorders should be carefully evaluated and especially the risk of stroke should be considered.

Age differences in symptoms of depression and anxiety: examining behavioral medicine outpatients

This study examined whether symptoms of depression and concomitant anxiety differed between older and younger medical outpatients referred to a behavioral medicine clinic. In a sample of 178 male veterans aged 21-83 years, older adults (> or = 60 years) reported lower overall depressive symptoms on the Beck Depression Inventory (BDI) and anxiety symptoms on the State-Trait Anxiety Inventory than did younger adults ( < 60 years). Depressive symptoms were highly prevalent. Among older adults, 60.0% scored 10 or higher on BDI and 33.8% scored 16 or higher. Among younger adults, 70.8% scored 10 or higher on BDI, and 48.7% scored 16 or higher. The age difference in overall depressive symptoms was driven by cognitive-affective symptoms. While older adults had lower cognitive-affective symptoms than did younger adults, the two groups did not differ on somatic-performance symptoms. these results suggest the importance of assessing cognitive-affective depressive symptoms in both older and younger male medical outpatients.

Comorbidity of late life depression: an opportunity for research on mechanisms and treatment

Late life depression principally affects individuals with other medical and psychosocial problems, including cognitive dysfunction, disability, medical illnesses, and social isolation. The clinical associations of late life depression have guided the development of hypotheses on mechanisms predisposing, initiating, and perpetuating specific mood syndromes. Comorbidity studies have demonstrated a relationship between frontostriatal impairment and late life depression. Further research has the potential to identify dysfunctions of specific frontostriatal systems critical for antidepressant response and to lead to novel pharmacological treatments and targeted psychosocial interventions. The reciprocal interactions of depression with disability, medical illnesses, treatment adherence, and other psychosocial factors complicate the care of depressed older adults. Growing knowledge of the clinical complexity introduced by the comorbidity of late life depression can guide the development of comprehensive treatment models. Targeting the interacting clinical characteristics associated with poor outcomes has the potential to interrupt the spiral of deterioration of depressed elderly patients. Treatment models can be most effective if they focus on amelioration of depressive symptoms, but also on treatment adherence, prevention of relapse and recurrence, reduction of medical burden and disability, and improvement of the quality of life of patients and their families.

Depressive symptoms and mortality in a prospective study of 2,558 older adults

OBJECTIVE

The authors report results from a 7-year prospective study of depression and mortality in 2,558 Medicare recipients age 65 and older.

METHODS

This report is based on a secondary data analysis of a randomized controlled trial that evaluated the cost-effectiveness of preventive services for older enrollees in an HMO.

RESULTS

Subjects with mild-to-moderate depression at baseline did not have an increased risk of mortality compared with those without significant depression. The 3% of older adults with the most severe depressive syndromes, however, had significant increases in mortality, even after adjusting for demographics, health risk behaviors, and chronic medical disorders.

CONCLUSION

The increase in mortality in this group of older adults was comparable to that in participants with chronic medical disorders such as emphysema or heart disease.

Neuropsychiatric aspects of HIV infection among older adults

Treatment advances such as the advent of highly active antiretroviral therapy (HAART) have translated into greater life expectancy for HIV-infected individuals, which will ultimately result in a "graying" of the HIV/AIDS epidemic. In addition, older individuals are engaging in a higher rate of high risk behaviors than had been previously expected. As such, study of older HIV-infected patients, including study of the psychiatric and neurocognitive aspects of the disease, appears highly indicated. Epidemiological studies have demonstrated that HIV infection is associated with higher rates of several psychological/psychiatric disorders when compared to general population base rates. There is also a rich literature that has documented the adverse neurocognitive effects of HIV infection, ranging from subtle cognitive complaints to frank dementia, among younger adults. Although it has been hypothesized that older age may potentiate the deleterious effects of HIV infection, little is actually known, however, regarding the incidence, prevalence, course, and clinical features of HIV-associated psychiatric and cognitive dysfunction among older adults. This article provides an overview of the epidemiology and clinical manifestations of HIV-associated cognitive and psychiatric disorder across the age spectrum, with particular focus on what is known regarding the interaction of advancing age and HIV infection. Future directions for research are suggested, including basic epidemiologic study of incidence and prevalence rates of neurodisease among older HIV-infected adults as well as investigations designed to determine whether the nature, severity, course, or treatment of such disorders differs among older versus younger patients.

Pharmacotherapy of depression in older patients: a summary of the expert consensus guidelines

Depression in older adults increases disability, medical morbidity, mortality, suicide risk, and healthcare utilization. Most studies of antidepressants are conducted in younger adults, and clinicians often have to extrapolate from findings in populations that do not present the same problems as older patients. Older patients often have serious coexisting medical conditions that may contribute to or complicate treatment of depression; they tend to take multiple medications, some of which may contribute to depression or interact with antidepressants; and they metabolize medications slowly and are more sensitive to side effects than younger patients. To address clinical questions not definitively answered in the research literature, the authors surveyed 50 experts on the pharmacotherapy of depressive disorders in older patients. The survey contained 64 questions with 857 options: 618 of the options were scored using a modified version of the RAND 9-point scale for rating appropriateness of medical decisions; for the other 239 options, the experts were asked to write in answers or check a box. The experts reached consensus on 89% of the options rated on the 9-point scale. Categorical rankings (first line/preferred, second line/alternate, third line/usually inappropriate) were assigned to each option based on the 95% confidence interval around the mean rating. Guideline tables indicating preferred treatment strategies were then developed for common and important clinical scenarios. The authors summarize the expert consensus methodology and the experts' recommendations and discuss how they relate to research findings. The experts recommend including both antidepressant medication and psychotherapy in treatment plans for nonpsychotic unipolar major depressive disorder of any severity, as well as for dysthymic disorder or persistent minor depressive disorder. They would also consider using either medication or psychotherapy alone for milder depression. For unipolar psychotic major depression, the treatment of choice is an antidepressant plus one of the newer atypical antipsychotics, with electroconvulsive therapy another first-line option. If the patient has a comorbid medical condition that is contributing to the depression, the experts recommend treating both the depression and the medical condition from the outset. The SSRIs were the top-rated antidepressants for all types of depression, with highest ratings for efficacy and tolerability given to citalopram and sertraline. Paroxetine was another first-line option, and fluoxetine was rated high second line. The preferred psychotherapy techniques for treating depression in older patients are cognitive-behavioral therapy, supportive psychotherapy, problem-solving psychotherapy, and interpersonal psychotherapy. The experts also recommended use of psychosocial interventions (e.g., psychoeducation, family counseling, visiting nurse services) in addition to pharmacotherapy and psychotherapy. Within limits of expert opinion and with the expectation that future research data will take precedence, these guidelines provide direction concerning common clinical dilemmas in older patients. They cannot address the complexities of each individual patient's care and can be most helpful in the hands of experienced clinicians.

Care for depression in HMO patients aged 65 and older

OBJECTIVE

To examine treatment for depression among older adults in a large staff model health maintenance organization (HMO).

DESIGN

A 4-year prospective cohort study (1989-1993).

SETTING

Four primary care clinics of a large staff model HMO in Seattle, Washington.

PATIENTS

A total of 2558 Medicare enrollees aged 65 and older.

MAIN OUTCOME MEASURES

Treatment of depression was defined as primary care visits resulting in depression diagnoses, use of antidepressant medications, or specialty mental health services.

MAIN RESULTS

The older adults in our sample had low rates of treatment for depression, ranging from 4 to 7% in the entire sample and from 12 to 25% among those with probable depressive disorders. Predictors of treatment included female gender, severity, and persistence of depressive symptoms, and severity of comorbid medical illness. Even when patients were treated for depression, the intensity of treatment was very low. Overall likelihood of treatment for depression increased somewhat from 1989 to 1993, but among those treated, the rate of adequate antidepressant use remained below 30%.

CONCLUSIONS

There is still considerable need to improve care for older adults with depression in primary care.