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Longitudinal brain volume changes in major depressive disorder.

Dilara Yüksel1, Jennifer Engelen2, Verena Schuster2

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Summary
This summary is machine-generated.

Major depressive disorder (MDD) patients show reversible gray matter volume changes in the amygdala, linked to the disorder's course. These findings suggest disease severity influences brain structure over time.

Keywords:
AmygdalaGray matter volumeGray matter volume normalizationMajor depressive disorderNumber of depressive episodesThalamus

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Area of Science:

  • Neuroimaging
  • Psychiatry
  • Neuroscience

Background:

  • Major depressive disorder (MDD) is associated with gray matter volume (GMV) reductions in limbic regions.
  • Clinical factors like depressive episode count may influence GMV alterations.
  • Longitudinal changes in GMV and their relationship to MDD progression remain unclear.

Purpose of the Study:

  • To investigate longitudinal GMV changes in MDD patients over a 3-year period.
  • To explore the relationship between GMV alterations and the course of the disorder.
  • To determine if structural abnormalities in MDD are dynamic and influenced by clinical phenotype.

Main Methods:

  • Utilized T1 structural MRI scans from 54 healthy controls (HC) and 37 MDD patients.
  • Employed a 3-Tesla MRI scanner with a 3-year follow-up interval.
  • Analyzed longitudinal data using the Cat12 toolbox with whole-brain analysis (FWE-corrected, p<0.05).

Main Results:

  • MDD patients showed increasing GMV in the bilateral amygdala and decreasing GMV in the right thalamus over 3 years.
  • Patients with a mild course of disorder (MCD) exhibited increased amygdalar volume.
  • A significant association was found between GMV changes and the course of MDD.

Conclusions:

  • Structural alterations in limbic regions are confirmed in MDD patients.
  • Volumetric changes in the amygdala appear reversible and linked to the clinical course of MDD.
  • Disease severity and progression significantly influence amygdalar GMV changes in MDD.