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BMC Psychiatry
Published in: BMC Psychiatry 1/2019

Open Access 01-12-2019 | Antidepressant Drugs | Research article

Delayed effect of bifrontal transcranial direct current stimulation in patients with treatment-resistant depression: a pilot study

Published in: BMC Psychiatry | Issue 1/2019

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Abstract

Background

Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique, which has yielded promising results in treating major depressive disorder. However, its effect on treatment-resistant depression remains to be determined. Meanwhile, as an emerging treatment option, patients’ acceptability of tDCS is worthy of attention.

Methods

This pilot study enrolled 18 patients (women = 13) with treatment-resistant unipolar (n = 13) or bipolar (n = 5) depression. Twelve sessions of tDCS were administered with anode over F3 and cathode over F4. Each session delivered a current of 2 mA for 30 min per ten working days, and at the 4th and 6th week. Severity of depression was determined by Montgomery–Åsberg Depression Rating Scale (MADRS); cognitive performance was assessed by a computerized battery.

Results

Scores of MADRS at baseline (29.6, SD = 9.7) decreased significantly to 22.9 (11.7) (p = 0.03) at 6 weeks and 21.5 (10.3) (p = 0.01) at 8 weeks. Six (33.3%) participants were therapeutically responsive to tDCS. MADRS scores of responders were significantly lower than those of non-responders at the 6th and 8th week. Regarding change of cognitive performance, improved accuracy of paired association (p = 0.017) and social cognition (p = 0.047) was observed at the 8th week. Overall, tDCS was perceived as safe and tolerable. For the majority of patients, it is preferred than pharmacotherapy and psychotherapy.

Conclusions

TDCS can be a desirable option for treatment-resistant depression, however, its efficacy may be delayed; identifying predictors of therapeutic response may achieve a more targeted application. Larger controlled studies with optimized montages and sufficient periods of observation are warranted.

Trial registration

This trial has been registered at the Chinese Clinical Trial Registry (ChiCTR-INR-16008179).
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Metadata
Title
Delayed effect of bifrontal transcranial direct current stimulation in patients with treatment-resistant depression: a pilot study
Publication date
01-12-2019
Published in
BMC Psychiatry / Issue 1/2019
Electronic ISSN: 1471-244X
DOI
https://doi.org/10.1186/s12888-019-2119-2

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