Biomedical subjects

Dimitris N Kiosses

Publications and source records attributed to Dimitris N Kiosses.

6 recordsLinked to original sources

PubMed2006

Frontal signal hyperintensities in mania in old age.

OBJECTIVE: Signal hyperintensities (SH) on magnetic resonance (MR) imaging have been associated with increased age and with mood disorders. Frontal and subcortical neuropathology has been implicated in the pathophysiology of mania and bipolar disorders. The authors assessed frontal and subcortical SH in elderly bipolar manic patients and the comparison group, and hypothesized that SH scores would be greater in the patient group. METHOD: MR imaging was performed in patients aged > or = 60 years with bipolar disorder, mania, and in a same-aged community comparison group. SH were rated blindly using the Boyko system. Frontal deep white matter and basal ganglia SH were assessed in the left and right hemispheres. RESULTS: SH scores were significantly greater in patients (N = 40) than the comparison group (N = 15) in frontal deep white matter (left: p = 0.003; right: p = 0.023) based on Mann-Whitney two-sample exact tests. The SH scores in the subcortical gray regions overlapped in these groups. In patients, higher right frontal SH scores were associated with later age at onset of mania. CONCLUSIONS: Frontal deep white matter SH may be increased in elders with bipolar disorder. Further study of the relationship of SH to age at onset in elders is warranted.

Aged↗

PubMed2005

Executive dysfunction and the course of geriatric depression.

BACKGROUND: Executive dysfunction is common in geriatric depression and persists after improvement of depressive symptoms. This study examined the relationship of executive impairment to the course of depressive symptoms among elderly patients with major depression. METHODS: A total of 112 nondemented elderly patients with major depression participated in an 8-week citalopram trial at a target daily dose of 40 mg. Executive functions were assessed with the initiation/perseveration subscale of the Dementia Rating Scale and the Stroop Color-Word test. Medical burden was rated with the Cumulative Illness Rating Scale. RESULTS: Both abnormal initiation/perseveration and abnormal Stroop Color-Word scores were associated with an unfavorable response of geriatric depression to citalopram. In particular, initiation/perseveration scores below the median (< or =35) and Stroop scores at the lowest quartile (< or =22) predicted limited change in depressive symptoms. Impairment in other Dementia Rating Scale cognitive domains did not significantly influence the outcome of depression. CONCLUSIONS: Executive dysfunction increases the risk for poor response of geriatric depression to citalopram. Because executive functions require frontostriatal-limbic integrity, this observation provides the rationale for investigation of the role of specific frontostriatal-limbic pathways in perpetuating geriatric depression. Depressed elderly patients with executive dysfunction require vigilant clinical attention because they might be at risk to fail treatment with a selective serotonin reuptake inhibiting antidepressant.

Aged↗

PubMed2005

IADL functions, cognitive deficits, and severity of depression: a preliminary study.

OBJECTIVE: Despite the documented association of cognitive dysfunction with impairment in instrumental activities of daily living (IADLs) in geriatric depression, the relationship among deficits in distinct IADLs with severity of depression and specific cognitive impairments remains to be clarified. The authors examined the relationship of depression severity and the cognitive domains of attention, initiation/perseveration, construction, conceptualization, and memory to nine distinct IADLs. METHODS: The subjects were 105 nondemented elderly patients but with impairment in at least one IADL and a history or presence of major depression. Impairment in IADLs and severity of depression were assessed with the Philadelphia Multilevel Assessment Instrument (MAI) and the 24-item Hamilton Depression Rating Scale (Ham-D), respectively. Cognitive dysfunction was assessed with the Mini-Mental State Exam (MMSE) and the Mattis Dementia Rating Scale (DRS). RESULTS: Six IADLs were influenced by impairment in at least one of the cognitive domains. Abnormal scores in initiation/perseveration, an aspect of executive dysfunction, was the cognitive impairment affecting most IADLs; it interfered with the ability to shop for groceries, prepare meals, take medicine, and manage money. Impairment in initiation/perseveration had a most prominent effect in the presence of depressive symptoms and affected shopping for groceries and preparing meals. Lack of interest and motivation, part of the depressive syndrome, compounded by behavioral abnormalities resulting from executive dysfunction, may account for this interaction. CONCLUSIONS: These relationships may provide the background for developing interventions targeting functional deficits associated with specific cognitive dysfunctions and depression.

Activities of Daily Living↗

PubMed2004

Executive dysfunction, heart disease burden, and remission of geriatric depression.

This study investigated the relationship of executive impairment and heart disease burden to remission of major depression among elderly patients. A total of 112 elderly subjects suffering from major depression received treatment with citalopram at a target daily dose of 40 mg for 8 weeks. Diagnosis was assigned using the Research Diagnostic Criteria and the DSM-IV Criteria after an interview with the Schedule for Affective Disorders and Schizophrenia. Executive dysfunction was assessed with the Initiation/Perseveration subscale of the Dementia Rating Scale (DRS) and the Color-Word Stroop test. Medical burden, including heart disease burden, was rated with the Cumulative Illness Rating Scale, and disability with Philadelphia Multilevel Instrument. Both abnormal initiation/perseveration and abnormal Stroop scores were associated with low remission rates of geriatric depression. Similarly, heart disease burden and baseline severity of depression also predicted low remission rates. The relationship of heart disease burden to remission was not mediated by executive dysfunction. Impairment in other DRS cognitive domains, disability, medical burden unrelated to heart disease did not significantly influence the outcome of depression in this sample. Executive dysfunction and heart disease burden constitute independent vulnerability factors that increase the risk for chronicity of geriatric depression. The findings of this study provide the rationale for investigation of the role of specific frontostriatal-limbic pathways in predisposing to geriatric depression or worsening its course.

Aged↗

PubMed2002

Frontal white matter microstructure and treatment response of late-life depression: a preliminary study.

OBJECTIVE: This study tested the hypothesis that microstructural abnormalities in white matter areas of the brain containing frontostriatal tracts are associated with a low rate of remission of geriatric depression. METHOD: Thirteen older patients with major depression received open, but controlled, treatment with citalopram at a target daily dose of 40 mg for 12 weeks. Diffusion tensor imaging was used to determine fractional anisotropy in preselected white matter regions. RESULTS: Survival analysis with Cox's proportional hazards model revealed that lower fractional anisotropy of the right and the left frontal white matter regions 15 mm above the anterior commissure-posterior commissure plane was associated with a low remission rate after age was considered. Remission was not significantly associated with fractional anisotropy of lower frontal regions or a temporal region. CONCLUSIONS: Microstructural white matter abnormalities lateral to the anterior cingulate may be associated with a low rate of remission of geriatric depression.

Aged↗

PubMedDate not supplied

Clinical presentation of the "depression-executive dysfunction syndrome" of late life.

It has been proposed that a "depression-executive dysfunction (DED) syndrome" occurs in late life. This assertion was based on clinical, neuropathological, and neuroimaging findings suggesting that frontostriatal dysfunctions contribute to the development of both depression and executive dysfunction and influence the course of depression. The authors describe the clinical presentation of DED and its relationship to disability, studying 126 elderly subjects with major depression and evaluating depressive symptoms, cognitive functioning, disability, and personality dimensions. Patients with the DED syndrome had reduced fluency, impaired visual naming, paranoia, loss of interest in activities, and psychomotor retardation, but showed a rather mild vegetative syndrome. Depressive symptomatology, and especially psychomotor retardation and loss of interest in activities, contributed to disability in DED patients, whereas paranoia was associated with disability independently of executive dysfunction. These findings may aid clinicians in identifying patients needing vigilant follow-up, because depression with executive dysfunction was found to be associated with disability, poor treatment response, relapse, and recurrence.

Aged↗