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The article you requested is

Imipramine Is Effective in Preventing Relapse in Electroconvulsive Therapy-Responsive Depressed Inpatients With Prior Pharmacotherapy Treatment Failure: A Randomized, Placebo-Controlled Trial.

J Clin Psychiatry 2006;67:263-268
Copyright 2006 Physicians Postgraduate Press, Inc.

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Objective: To compare the efficacy of imipramine versus placebo in preventing relapse after successful electroconvulsive therapy (ECT) in depressive inpatients with pharmacotherapy treatment failure prior to ECT.

Method: During a 6-month period, the incidence of relapse was assessed. Two centers, both inpatient units for treatment of depressed patients, participated in this trial. Patients with DSM-IV-diagnosed major depressive disorder resistant to an antidepressant and subsequent lithium addition and/or a monoamine oxidase inhibitor were included. Patients were randomly assigned to double-blind treatment with imipramine with adequate plasma levels (N = 12) or placebo (N = 15) after successful ECT. The mean imipramine dosage was 209 mg/day (standard deviation: 91.7, range: 75 - 325 mg/day). The main outcome measure was relapse defined as at least "moderately worse" compared with baseline score on the Clinical Global Impressions-Improvement scale. Treatments were compared with survival analysis using the Cox proportional hazards model, including psychotic features and the score on the Hamilton Rating Scale for Depression (HAM-D) at baseline as prespecified covariables. Patients were enrolled in the study from April 1997 to July 2001.

Results: In the placebo group, 80% (12/15) of the patients relapsed compared with 18% (2/11) in the imipramine group. The Cox regression analysis showed a significant reduction in the risk of relapse of 85.6% with imipramine compared to placebo (p = .007; 95% confidence interval [CI] = 24.6% to 97.2%) adjusted for the covariables. There was an 18% increase in the relapse rate (p = .032; 95% CI = 2% to 36%) per unit increase in HAM-D score before the start of the trial; psychotic features had no significant effect (p = .794).

Conclusions: Depressed patients with pharmacotherapy treatment failure may benefit from the prophylactic effect of the same class of drug during maintenance therapy after response to ECT.