Major depression is a mood disorder that is often accompanied by the impairment of cognitive functions. Although suggestive, the large range of existing neuropsychological, neuropsychiatric, and, lately, neuroimaging investigations have not yet given a consistent picture of the psychological and biological disturbances involved in this psychiatric disorder. The present study of the cognitive functions in depression was part of an extensive investigation, including neuropsychological testing, psychiatric examination, and neuroimaging. A representative sample of 40 severely depressed hospitalized patients and a group of 49 closely matched control subjects were tested with an extensive neuropsychological test battery. Results, corrected for various confounding factors, confirmed the current notion that depressed patients suffer from wide-spread cognitive impairments. The group analysis did not allow any hypothesis on a possible pattern to the dysfunctions, but heterogeneity in the test performances calls for further analysis of the data in patient subgroups in relation to neuroimaging results.

A short patient and relative education programme seems to be able to influence knowledge and some aspects of satisfaction, but does not seem to be sufficient to influence important variables such as relapse, compliance, psychopathology, insight or psychosocial functioning.

Our findings support the notion that depressed patients have disturbances in the loops connecting the frontal lobes, limbic system, basal ganglia, and cerebellum.

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Repetitive transcranial magnetic stimulation was significantly less effective than ECT, but ECT had more adverse effects on cognitive function. The outcome does not point to right frontal low-frequency rTMS using the present stimulus design as a first-line substitute for ECT, but rather as a treatment option for patients with depression who are intolerant to other types of treatment or not accepting ECT.

Brain atrophy and white matter lesions did not occur with significantly increased frequency in these relatively young unselected depressives, but the finding of severe brain pathology stresses the importance of brain imaging in late-onset psychiatric disorders.

Recent research indicates that repetitive transcranial magnetic stimulation (rTMS) over the frontal cortex has an antidepressant effect. The aim of the present pilot study was to assess the antidepressant effect, side-effects and the applicability in daily clinical practice of left prefrontal high-frequency rTMS. Fifteen inpatients with major depression (ICD-10 and DSM-IV) were randomized to receive 15 days of real left prefrontal high-frequency rTMS (20 trains of 10 s, 60-s interval, 10 Hz, 90% of motor threshold) or sham rTMS as add on to conventional antidepressant treatment. Depressive symptoms and side-effects were evaluated blindly during the treatment period. Five out of eight patients receiving real rTMS suffered from local discomfort during treatment. Three of them dropped out and the project was closed for that reason. Real rTMS did not add efficacy to standard antidepressant medication. This pilot study did not confirm the antidepressant effect of left frontal high-frequency rTMS. Unwanted effects led to considerable patient drop-out and premature termination of the study. The result suggests that alternative treatment delivery technology should be considered.