Healthy Clinical Trial
Official title:
Predicting Illness Trajectories In Fully Remitted Major Depression Using Concurrent TBS/fNIRS
Major depressive disorder (MDD) is the world's leading cause of disability according to the World Health Organization. MDD is highly recurrent, even if clinical remission is reached after successful treatment. In fact, the enormous burden of disability, mortality and financial costs is due to the recurrent and chronic nature of MDD. The reliable prediction of the recurrence of major depressive episodes (MDEs) based on a prognostic model that is informed by biological, neurophysiological or neuroimaging data would be valuable and lifesaving for many. However, such models are still lacking. Several lines of evidence point to abnormal prefrontal control over limbic emotion processing areas in MDD owing to diminished prefrontal excitability that seems to persist during MDD remission (rMDD). Prefrontal excitability in rMDD may thus be a trait marker of MDD and may potentially be indicative of disease recurrence. Yet, research investigating the potential utility of prefrontal excitability for predicting the recurrence of MDEs is lacking. Cortical excitability can be investigated using transcranial magnetic stimulation (TMS); however, human studies have mostly probed cortical excitability of the motor cortex, a brain region not considered to be central in the neuropathology of MDD. Hence, knowledge of the effect of TMS on prefrontal excitability is limited. Moreover, whether immediate prefrontal modulation by TMS can predict the recurrence of MDEs in fully remitted MDD patients remains to be investigated. Thus, there is a need for research that aims to quantify the direct and immediate aftereffects of TMS on prefrontal function. Most importantly, with regard to precision medicine, there is a need for research that explores the utility of immediate prefrontal reactivity to TMS for predicting MDE recurrence. Here, the investigators propose a research program that will exploit the combination of functional near-infrared spectroscopy (fNIRS) with brain stimulation. Concurrent theta-burst stimulation (TBS)/fNIRS measurements will allow us to systematically investigate stimulation-induced modulation of blood oxygenation as a proxy for induced brain activity changes (TBS is a modern form of patterned TMS). The findings from this study will (1) elucidate the immediate effects of excitatory and inhibitory brain stimulation on prefrontal activity in rMDD and controls and (2) validate the potential utility of stimulation-induced brain modulation for the prediction of MDE recurrence.
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