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Indirect frontocingulate structural connectivity predicts clinical response to accelerated rTMS in major depressive disorder

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Version 2 2024-06-05, 06:43
Version 1 2020-05-11, 13:44
journal contribution
posted on 2024-06-05, 06:43 authored by DCW Klooster, IN Vos, Karen CaeyenberghsKaren Caeyenberghs, A Leemans, S David, RMH Besseling, AP Aldenkamp, C Baeken
Background: Repetitive transcranial magnetic stimulation (rTMS) is an established treatment for major depressive disorder (MDD), but its clinical efficacy remains rather modest. One reason for this could be that the propagation of rTMS effects via structural connections from the stimulated area to deeper brain structures (such as the cingulate cortices) is suboptimal. Methods: We investigated whether structural connectivity — derived from diffusion MRI data — could serve as a biomarker to predict treatment response. We hypothe-sized that stronger structural connections between the patient-specific stimulation position in the left dorsolateral prefrontal cortex (dlPFC) and the cingulate cortices would predict better clinical outcomes. We applied accelerated intermittent theta burst stimulation (aiTBS) to the left dlPFC in 40 patients with MDD. We correlated baseline structural connectivity, quantified using various metrics (fractional anisotropy, mean diffusivity, tract density, tract volume and number of tracts), with changes in depression severity scores after aiTBS. Results: Exploratory results (p < 0.05) showed that structural connectivity between the patient-specific stimulation site and the caudal and posterior parts of the cingulate cortex had predictive potential for clinical response to aiTBS. Limitations: We used the diffusion tensor to perform tractography. A main limitation was that multiple fibre directions within voxels could not be re-solved, which might have led to missing connections in some patients. Conclusion: Stronger structural frontocingular connections may be of essence to optimally benefit from left dlPFC rTMS treatment in MDD. Even though the results are promising, further investigation with larger numbers of patients, more advanced tractography algorithms and classic daily rTMS treatment paradigms is warranted. Clinical trial registration: http://clinicaltrials.gov/show/NCT01832805.

History

Journal

Journal of psychiatry and neuroscience

Volume

45

Pagination

243-252

Location

Ottawa, Ontario

Open access

  • Yes

ISSN

1180-4882

eISSN

1488-2434

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Issue

4

Publisher

Canadian Medical Association

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