Efficacy of ECT in chronic, severe, antidepressant- and CBT-refractory PTSD: an open, prospective study.

Background: Treatment options are limited in patients with severe, chronic, posttraumatic stress disorder (PTSD). There is little information on the use of electroconvulsive therapy (ECT) for PTSD.

Methods: Between January 1, 2005, and December 31, 2005, all consenting adults (n=20) with severe, chronic, extensively antidepressant-refractory PTSD were prospectively treated with a fixed course of 6 bilateral ECT treatments administered on an outpatient basis at a twice-weekly frequency. The primary outcome measure was improvement on the Clinician-Administered Posttraumatic Stress Disorder Scale (CAPS). Baseline refractoriness was defined as a failure to respond to an adequate course of at least 4 different antidepressant drugs along with 12 sessions of cognitive behavior therapy. Response to ECT was defined as at least 30% attenuation of CAPS ratings, and remission as an endpoint CAPS score of 20 or less. After ECT, patients were prescribed sertraline (100-150 mg/day) or mirtazapine (15-30 mg/day).

Results: All but 3 patients completed the ECT course. An intent-to-treat analysis (n=20) showed statistically and clinically significant improvement in the sample as a whole: CAPS scores decreased by a mean of 34.4%, and depression scores by a mean of 51.1%. Most of the improvement in CAPS and depression ratings developed by the third ECT; that is, by day 10 of treatment, itself. The improvement in CAPS ratings was independent of the improvement in depression ratings; and improvement in CAPS did not differ significantly between patients with less severe vs more severe baseline depression. The response rate was 70%; no patient remitted. In the completer analysis (n=17), mean improvements were 40% and 57% for CAPS and depression ratings, respectively, and the response rate was 82%. Treatment gains were maintained at a 4-6 month follow-up.

Conclusions: ECT may improve the core symptoms of PTSD independently of improvement in depression, and may therefore be a useful treatment option for patients with severe, chronic, medication- and CBT-refractory PTSD.