[Specific aspects of endogenous mental disorders with seasonal depressions]

The clinical features and the course of seasonal depressions in endogenous mental diseases were studied with psychopathological and follow-up methods. The seasonal depressions in 50 patients were developed in the psychopathological structure of manic-depressive psychosis (22 patients), schizoaffective psychosis (23) and schizoaffective variant of schizophrenia (5). There were found the considerable differences in the characteristics of seasonal depressions in the indicated endogenous psychoses. The was established that spring summer depressions had more favorable prognostic meaning in comparison with fall-winter depressions. There was shown that changes or disappearance of the seasonal rhythm of depression's development was prognostic unfavourable sign and pointed to the change to the worse of disease.