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[Mode of onset and two years outcome of a broad spectrum of affective disorders].

In recent years emphasis has tended to be placed on assessing and diagnosing low-grade affective disorders. If mild affective symptoms are also considered a broad spectrum of affective disorders, this spectrum can be seen, not only in the manifestation of major symptoms of such illnesses as manic-depressive illness, but also in symptoms of various mental disorders. The present study was undertaken to analyze the clinical features of a broad spectrum of affective disorders in a prospective follow-up study. Ninety mentally ill patients who visited our outpatient clinic were followed for 2 years, to investigate the mode of onset, the course and outcome of their disorders. Using a semistructured interview method specially developed for this survey, these patients were divided into a broad spectrum of affective disorder group and the other groups. Forty-nine patients were allocated to a spectrum of affective disorder group characterized by four-day (or longer) persistence of at least one of the following symptoms, depressed mood, loss of interest or elevated, expansive, or irritable mood. Of the forty-nine patients there were only two patients with manic symptoms. And the forty-seven patients with depressive symptoms were compared with the other groups as a main subject. The other groups were composed of eighteen patients with psychotic symptoms (the psychotic group) and 23 patients with neurotic symptoms (the neurotic group). The psychotic and neurotic groups did not satisfy the criteria shown above. There was no significant differences in male-to-female ratio or age between these three groups. When the mode of onset of symptoms were compared, the percentage of cases in whom symptoms could be identified early (within 10 days after onset) was 64.4% in the depressive group, 41.2% in the psychotic group and 30.4% in the neurotic group. The percentage of cases who remitted 2 years later was 70.2%, 38.9%, 45.5% in the depressive group, psychotic and neurotic groups, respectively. The GAS score (mean +/- SD), assessed 2 years later, was 76.2 +/- 12.5, 62.8 +/- 11.7, 78.2 +/- 9.9 points for these three groups, respectively. These results suggest that a broad spectrum of depressive disorders develops more acutely and patients with this spectrum are more likely to recover from symptoms and in function. Thus, the course of disorders was more favorable in the depressive group than in the psychotic group or the neurotic group.