Abnormal brain oscillations persist after recovery from bipolar depression.

[en] When directly perturbed in healthy subjects, premotor cortical areas generate electrical oscillations in the beta range (20-40Hz). In schizophrenia, major depressive disorder and bipolar disorder (BD), these oscillations are markedly reduced, in terms of amplitude and frequency. However, it still remains unclear whether these abnormalities can be modulated over time, or if they can be still observed after treatment. Here, we employed transcranial magnetic stimulation (TMS) combined with EEG to assess the frontal oscillatory activity in eighteen BD patients before/after antidepressant treatments (sleep deprivation and light therapy), relative to nine healthy controls. In order to detect dominant frequencies, event related spectral perturbations (ERSP) were computed for each TMS/EEG session in all participants, using wavelet decomposition. The natural frequency at which the cortical circuit oscillates was calculated as the frequency value with the largest power across 300ms post-stimulus time interval. Severity of depression markedly decreased after treatment with 12 patients achieving response and nine patients achieving remission. TMS/EEG resulted in a significant activation of the beta/gamma band response (21-50Hz) in healthy controls. In patients, the main frequencies of premotor EEG responses to TMS did not significantly change before/after treatment and were always significantly lower than those of controls (11-27Hz) and comparable in patients achieving remission and in those not responding to treatment. These results suggest that the reduction of natural frequencies is a trait marker of BD, independent from the clinical status of the patients. The present findings shed light on the neurobiological underpinning of severe psychiatric disorders and demonstrate that TMS/EEG represents a unique tool to develop biomarkers in psychiatry.

Disciplines :

Neurology

Author, co-author :

Canali, P.

Casarotto, Silvia

Rosanova, Mario

Sferrazza-Papa, G.

Casali, A. G.

Gosseries, Olivia ; Université de Liège - ULiège > Centre de recherches du cyclotron

Massimini, Marcello

Smeraldi, E.

Colombo, C.

Benedetti, F.

Language :

English

Title :

Abnormal brain oscillations persist after recovery from bipolar depression.

Publication date :

2017

Journal title :

European Psychiatry

ISSN :

0924-9338

eISSN :

1778-3585

Publisher :

Elsevier Masson, Paris, France

Volume :

Pages :

10-15

Peer reviewed :

Peer Reviewed verified by ORBi

Commentary :

Available on ORBi :

since 22 August 2019

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Bibliography

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