Transcranial Magnetic Stimulation of the Supplementary Motor Area in the Treatment of Obsessive-Compulsive Disorder: A Multi-Site Study

Emily R Hawken, Dancho Dilkov, Emil Kaludiev, Selcuk Simek, Felicia Zhang, Roumen Milev, Emily R Hawken, Dancho Dilkov, Emil Kaludiev, Selcuk Simek, Felicia Zhang, Roumen Milev

Abstract

Recently, strategies beyond pharmacological and psychological treatments have been developed for the management of obsessive-compulsive disorder (OCD). Specifically, repetitive transcranial magnetic stimulation (rTMS) has been employed as an adjunctive treatment in cases of treatment-refractory OCD. Here, we investigate six weeks of low frequency rTMS, applied bilaterally and simultaneously over the sensory motor area, in OCD patients in a randomized, double-blind placebo-controlled clinical trial. Twenty-two participants were randomly enrolled into the treatment (ACTIVE = 10) or placebo (SHAM = 12) groups. At each of seven visits (baseline; day 1 and weeks 2, 4, and 6 of treatment; and two and six weeks after treatment) the Yale-Brown Obsessive Compulsive Scale (Y-BOCS) was administered. At the end of the six weeks of rTMS, patients in the ACTIVE group showed a clinically significant decrease in Y-BOCS scores compared to both the baseline and the SHAM group. This effect was maintained six weeks following the end of rTMS treatment. Therefore, in this sample, rTMS appeared to significantly improve the OCD symptoms of the treated patients beyond the treatment window. More studies need to be conducted to determine the generalizability of these findings and to define the duration of rTMS' clinical effect on the Y-BOCS. Clinical Trial Registration Number (NCT) at www.clinicaltrials.gov: NCT00616486.

Keywords: Yale-Brown obsessive compulsive scale; low-frequency rTMS; sensory motor area.

Figures

Figure 1
Figure 1
Yale-Brown Obsessive Compulsive Scale (Y-BOCS) mean scores (±SE) from baseline (Visit 1) to the end of repetitive transcranial magnetic stimulation (rTMS) treatment (Visit 5) with a significant difference (*) at Visit 5; * p < 0.05. Hedge’s g at Visit 5: 1.001.
Figure 2
Figure 2
Y-BOCS mean scores (±SE) from baseline (Visit 1), the end of rTMS treatment (Visit 5), at the two-week (Visit 6) and six-week (Visit 7) follow-ups. Numbers inset in the bars represent participants in each group. † ACTIVE vs. SHAM p < 0.001.

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Source: PubMed

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