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Accelerated iTBS changes perfusion patterns in medication resistant depression.

Guo-Rong Wu1, Romain Duprat2, Chris Baeken3

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This summary is machine-generated.

Accelerated intermittent Theta Burst Stimulation (aiTBS) rapidly improves depression by altering brain perfusion in key areas. This non-invasive treatment shows prompt neurobiological effects, offering new hope for medication-resistant depression patients.

Keywords:
Accelerated iTBSArterial spin labelingBrain perfusionMajor depressive disorder

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Medical Imaging

Background:

  • Medication-resistant depression (MRD) requires novel treatments.
  • Accelerated intermittent Theta Burst Stimulation (aiTBS) is a promising non-invasive brain stimulation protocol for MRD.
  • Limited studies combine neuroimaging with clinical outcomes for aiTBS.

Purpose of the Study:

  • To investigate brain perfusion changes associated with clinical improvement in MRD patients treated with aiTBS.
  • To explore the neurobiological underpinnings of aiTBS efficacy using Arterial Spin Labeling (ASL) brain imaging.
  • To differentiate effects of active aiTBS from sham treatment.

Main Methods:

  • A sham-controlled study involving 45 antidepressant-free MRD patients.
  • Application of aiTBS to the left dorsolateral prefrontal cortex.
  • Pre- and post-treatment ASL brain imaging to assess cerebral blood flow patterns.

Main Results:

  • Active aiTBS increased perfusion in the ventromedial prefrontal cortex and right inferior parietal lobule.
  • Active aiTBS decreased perfusion in the left parahippocampal gyrus and right posterior cerebellar lobe.
  • Sham aiTBS led to perfusion decreases in the right angular gyrus, suggesting a placebo response.

Conclusions:

  • Active aiTBS rapidly alters brain perfusion in regions connected to the stimulated area and implicated in depression.
  • Observed perfusion changes provide neurobiological evidence for aiTBS effectiveness in MRD.
  • Placebo responses may contribute to the clinical effects of accelerated intermittent stimulation protocols.