The aim of this study was to compare the sociodemographic and clinic characteristics of patients with bipolar disorder type I with and without history of depressive episode.

In this study the data of 108 bipolar type I patients who were admitted to psychiatry clinic of a university hospital due to manic episode between 2007–2009 were examined.

According to these data, 16 of 108 bipolar disorder type I patients (14.8%) had inhabited at least 4 manic episodes throughout their lives and there was no history of depressive episode although the disease had continued at least 4 years. with and without a history of depressive episode of bipolar type I patients have not been identified differ in terms of sociodemographic and clinical characteristics, but patients not having a history of depressive episode during their lifetime was found to be more than the number of hospitalizations.

Current information seem to be not sufficient to define unipolar mania as a separate nosological class. Largescale, prospective designs and illuminating the pathophysiology and etiology studies needs to be done in this issue.