Effectiveness and outcome predictors of long-term
lithium prophylaxis in unipolar major depressive disorder

by
Baethge C, Gruschka P, Smolka MN, Berghofer A,
Bschor T, Muller-Oerlinghausen B, Bauer M.
Consolidated Department of Psychiatry,
Harvard Medical School,
the Bipolar and Psychotic Disorders Program,
McLean Division of Massachusetts General Hospital,
Belmont, Mass.,
and the
Department of Psychiatry and Psychotherapy,
Universitatsklinikum Benjamin Franklin,
Freie Universitat Berlin, Germany.
J Psychiatry Neurosci. 2003 Sep;28(5):355-361


ABSTRACT

OBJECTIVE: To determine the effectiveness of lithium prophylaxis in unipolar major depressive disorder (MDD) and to identify predictors of outcome including comedication. METHODS: In this long-term naturalistic study, clinical data from 55 patients with MDD (DSM-III-R) were collected prospectively in an outpatient clinic specializing in the treatment of affective disorders. OUTCOME MEASURES: Change in hospital admission rate (number and duration) during prophylaxis compared with the period before prophylaxis, Morbidity-Index during prophylaxis and time to first recurrence after initiation of lithium treatment. RESULTS: During an average follow-up period of 6.7 years, a significant decline in the number of days spent in hospital (p < 0.001; 52 d/yr less; 95; CI 31-73 d) and a low Morbidity-Index (mean 0.07) was observed. Only in 6 patients did medication have to be changed because of side-effects (n = 4) or a lack of efficacy (n = 2). None of the independent variables we analyzed proved to be important in predicting the outcome of lithium prophylaxis. Comedication was necessary in 21 patients. The overall outcome of their prophylactic treatment, however, did not differ from the group that did not receive comedication in the symptom-free intervals. CONCLUSIONS: The results of this study, with its long observation period and the inclusion of comedication as a confounding variable, indicate that lithium is a potent prophylactic agent for unipolar MDD in a naturalistic setting. In contrast to the findings of others, age was not associated with the outcome of prophylaxis, and latency did not predict outcome. Contrary to doubts that have been raised in recent years with regard to the effectiveness of lithium in everyday clinical practice, lithium appears to be a safe and potent alternative to antidepressants.
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