Self-reported quality of life across mood states in bipolar disorder

Abstract

In distinction to the classic conceptualization of mania and hypomania, a growing body of work indicates that these episodes are not typically characterized by euphoric mood and sense of increased well-being, but rather by significant dysphoric symptoms. However, few data exist concerning self-perceived quality of life in mania or hypomania. Such data are important both for better understanding of the illness, and are particularly important for developing appropriate cost-utility studies. Accordingly, we hypothesized that two measures of self-reported quality of life, the mental subscale of the Short Form-12 (SF-12) and the EuroQol, would show reduced quality of life in patients in manic/hypomanic or mixed episodes, compared to those who were euthymic. Eighty-six patients with bipolar disorder from four Department of Veterans Affairs (VA) medical centers were assessed in a cross-sectional design. Mood state was categorized by physician diagnosis and separately by patient self-report using the Internal State Scale (ISS). Self-reported quality of life was quantified using the SF-12 and EuroQol. Findings were identical regardless of how mood state was determined. The SF-12 mental subscale and EuroQol differed significantly across mood states. Patients with mania/hypomania were either less than (SF-12 mental subscale) or equal to (EuroQol) euthymic patients, while patients in a mixed episode resembled those in a depressive episode on both indices. In contrast, SF-12 physical subscale scores showed no intergroup differences. These quality-of-life data provide further support for the conceptualization that mania and hypomania are syndromes characterized by reduced, rather than increased, sense of well-being and quality of life. Moreover, depressive symptoms appear to be the primary determinant of quality of life in bipolar disorder, although other factors may be associated with both depression and reduced quality of life in bipolar disorder.