The use of background EEG activity to determine stimulus timing as a means of improving rTMS efficacy in the treatment of depression: a controlled comparison with standard techniques

Brain Stimulation
Gregory W PriceNathan Gibson

Abstract

Repetitive transcranial magnetic stimulation (rTMS) treatment of depression utilizes numerous predetermined patterns of stimulation. As an alternative to using invariant stimulus timing parameters, the interactive technique delivers individual stimuli based on the background electroencephalogram (EEG) activity. This study examines the use of an EEG-dependent technique as a means to enhance the efficacy of rTMS in the treatment of depression. Forty-four patients with treatment-refractory major depression were treated, in a randomized, doubleblind, 4-week trial, with two different rTMS stimulus timing techniques (left dorsolateral prefrontal cortex). Standard rTMS utilized 10-Hz stimuli, whereas interactive rTMS applied individual stimuli in response to a selected pattern of background EEG activity analyzed in real time. Hamilton Depression Rating Scale (HDRS) and the Beck's Depression Inventory-II (BDI) scores were recorded at baseline, 2 weeks and after the final treatment. The interactive group showed a trend toward greater efficacy than the standard group in both absolute (t=-1.68; P=.100) and percentage (t=-1.74; P=.090) change in scores on HDRS (and similarly BDI). The response rate (>50% reduction) for the interactive tech...Continue Reading

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