Understanding the link between anxiety symptoms and suicidal ideation and behaviors in outpatients with bipolar disorder.

BACKGROUND: Prior studies suggest an association between anxiety comorbidity and suicidal ideation and behaviors in bipolar disorder. However, the nature of this association remains unclear.
METHODS: We examined a range of anxiety symptoms, including panic, phobic avoidance, anxiety sensitivity, worry and fear of negative evaluation, in 98 patients with bipolar disorder. We predicted that each anxiety dimension would be linked to greater suicidal ideation and behavior as measured by Linehan's Suicide Behaviors Questionnaire (SBQ), greater depressive rumination, and poorer emotional processing and expression.
RESULTS: Each anxiety dimension except fear of negative evaluation was associated with greater SBQ score, greater rumination, and lower levels of emotional processing in univariate analyses. Depressive rumination was a significant predictor of higher SBQ scores in a stepwise multivariate model controlling for age, gender, bipolar subtype, and bipolar recovery status; the association between the anxiety symptom dimensions and SBQ score was found to be redundant with depressive rumination. Emotional processing emerged as protective against suicidal ideation and behaviors in men only, while emotional expression was a significant predictor of lower SBQ scores for women and for the full sample; however, emotional expression was not significantly correlated with anxiety symptoms. Confirmatory analyses examining only those in recovery or recovered (n=68) indicated that the link between rumination and suicidality was not explained by depression. LIMITATIONS: Interpretation is limited by the cross-sectional study design.
CONCLUSIONS: These findings indicate that increased ruminations may mediate the association between anxiety and suicidal ideation/behavior. In men, lower emotional processing may also play a role in this relationship.