The Impact of Accelerated HF-rTMS on the Subgenual Anterior Cingulate Cortex in Refractory Unipolar Major Depression: Insights From 18FDG PET Brain Imaging

Brain Stimulation
C BaekenR De Raedt

Abstract

Although one of the most frequent diagnosed mental illnesses worldwide, it appears to be challenging to successfully treat major depressive disorder (MDD). Although the phenomenon of treatment-resistant depression (TRD) still remains unclear, the subgenual anterior cingulate cortex (sgACC) has been put forward as a possible neurobiological marker to evaluate clinical effects of a variety of antidepressant treatments, including repetitive transcranial magnetic stimulation (rTMS). Accelerated high-frequency (HF)-rTMS may have the potential to rapidly result in beneficial clinical outcomes in TRD. No studies yet examined the clinical effects of such accelerated stimulation treatment paradigms on sgACC regional glucose metabolism (CMRglc), nor the predictive value of the latter for clinical outcome. First, we investigated the predictive value of baseline sgACC metabolic activity for clinical outcome. Second, we hypothesized that in clinical responders only accelerated HF-rTMS treatment would result in significant metabolic decreases. We recruited right-handed antidepressant-free unipolar melancholic TRD patients to participate in a two-week randomized sham-controlled crossover HF-rTMS treatment study. Stimulation was applied to the...Continue Reading

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