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  • Title: History of depressive and/or anxiety disorders as a predictor of treatment response: a post hoc analysis of a 12-week, randomized, double-blind, placebo-controlled trial of paroxetine controlled release in patients with fibromyalgia.
    Author: Pae CU, Masand PS, Marks DM, Krulewicz S, Peindl K, Mannelli P, Patkar AA.
    Journal: Prog Neuropsychopharmacol Biol Psychiatry; 2009 Aug 31; 33(6):996-1002. PubMed ID: 19433129.
    Abstract:
    BACKGROUND: Despite of a high comorbidity of depressive and/or anxiety disorders with fibromyalgia, information on the clinical implications of this comorbidity is limited but antidepressants are commonly prescribed to treat fibromyalgia in clinical practice. We investigated whether a history of depressive and/or anxiety disorders was associated with response to paroxetine controlled release (CR) in the treatment of fibromyalgia. METHODS: One hundred sixteen (116) fibromyalgia subjects were randomized to receive paroxetine CR or placebo for 12 weeks. The primary outcome was treatment response defined as >or=25% reduction in the Fibromyalgia Impact Questionnaire (FIQ) score. In multivariate logistic regression, we determined if a history of depression and/or anxiety disorders was an independent predictor of response to paroxetine CR. RESULTS: In logistic regression, the history of depression and/or anxiety did not predict treatment response as measured by >or=25% reduction in Fibromyalgia Impact Questionnaire (FIQ) score (OR=0.66, 95% CI=.29-1.49, Wald=0.97, p=0.32), while the drug status (paroxetine CR) was significantly associated with treatment response (OR=2.57, CI=1.2-5.61, Wald=5.5, p=0.02). CONCLUSION: A significant proportion of patients with fibromyalgia had a history of anxiety and or depressive disorders. However response to treatment of fibromyalgia symptoms with paroxetine CR was not associated with a history of depressive and/or anxiety disorders. Our findings need to be confirmed in more adequately-powered and well-designed subsequent studies.
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