Treatment effect on temperament and character in panic disorder: a prospective randomized double-blind study

OBJECTIVE: The present study aims to analyze the effect of pharmacological treatment for panic disorder on temperament and character dimensions and to compare the effect of imipramine and fluoxetine on this outcome. METHOD: Temperament and character dimensions were evaluated in panic disorder patients before and after six months of pharmacological treatment with imipramine and fluoxetine, using the Temperament and Character Inventory-Revised. Patients were randomized between groups and both (patient and investigators) were blinded to the intervention drug. Furthermore, 34 non-panic controls answered the revised Temperament and Character Inventory through an Internet survey. RESULTS: Panic disorder patients showed higher scores for Harm Avoidance and lower scores for Persistence, Self-Directedness, and Cooperativeness than controls at baseline, but only the low Persistence value remained different from controls after treatment. Responder patients presented significant reduction in Harm Avoidance scores and a significant increase in Self-Directedness scores, whereas non-responders showed a significant increase of Harm Avoidance levels. Fluoxetine and Imipramine showed similar effects on the revised Temperament and Character Inventory dimensions. CONCLUSION: High Harm Avoidance and low Self-Directedness, Persistence, and Cooperativeness are associated with panic disorder. Treatment of acute panic disorder symptoms lead to the reduction of Harm Avoidance and to an increase in Self-Directedness scores. However, there was no difference between treatment with fluoxetine and imipramine for the effect on the revised Temperament and Character Inventory dimensions.