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Lithium treatment -- moderate dose use study (LiTMUS) for bipolar disorder: rationale and design.

Author(s): Nierenberg AA, Sylvia LG, Leon AC, Reilly-Harrington NA, Ketter TA, Calabrese JR, Thase ME, Bowden CL, Friedman ES, Ostacher MJ, Novak L, Iosifescu DV, Litmus Study Group

Affiliation(s): Department of Psychiatry, Massachusetts General Hospital, Boston, MA 02114, USA. anierenberg@partners.org

Publication date & source: 2009-12, Clin Trials., 6(6):637-48. Epub 2009 Nov 23.

Publication type: Randomized Controlled Trial; Research Support, N.I.H., Extramural

BACKGROUND: Recent data indicate that lithium use for bipolar disorder has declined over the last decade and that lithium largely has been replaced with alternate, commercially promoted medications that may or may not result in better outcomes. PURPOSE: This article describes the rationale and study design of LiTMUS, a multi-site, prospective, randomized clinical trial of outpatients with bipolar disorder. LiTMUS seeks to address whether initiating therapy at lower doses of lithium as part of optimized treatment (OPT, guideline-informed, evidence-based, and personalized pharmacotherapy) improves outcomes and decreases the need for other medication changes across 6 months of therapy. METHODS: LiTMUS will randomize 284 adults with bipolar disorder (Type I or II) across 6 study sites. The co-primary outcomes are overall illness severity on clinical global improvement scale for bipolar disorder and a novel measure, necessary clinical adjustments. This metric provides a composite that reflects both clinical response and tolerability. Other relevant outcomes include full symptomatic recovery, quality of life, suicidal behaviors, and moderators of suicidality. RESULTS: As of August 28th, 2009, we have consented 338 patients and randomized 281 for this study. LIMITATIONS: The potential limitations of the study include an arbitrary definition of 'low, but effective' doses of lithium, lack of a placebo-controlled group, open treatment, and use of a new outcome measure (i.e., necessary clinical adjustments). CONCLUSION: We expect that this study will inform our understanding of the effectiveness of low to moderate doses of lithium therapy for individuals with bipolar disorder.

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