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Cortical thickness differences between bipolar depression and major depressive disorder.

Martin J Lan1, Binod Thapa Chhetry, Maria A Oquendo

  • 1Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY, USA; Division of Molecular Imaging and Neuropathology, New York State Psychiatric Institute, New York, NY, USA.

Bipolar Disorders
|January 17, 2014
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Summary

Cortical thickness differences in the brain can distinguish bipolar disorder (BD) from major depressive disorder (MDD). This imaging biomarker may aid in accurate diagnosis and treatment of these mood disorders.

Keywords:
bipolar disordercortical thicknessmagnetic resonance imagingmajor depressive disorderneuroimaging

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Medical Imaging

Background:

  • Bipolar disorder (BD) and major depressive disorder (MDD) share depressive symptoms, making early differentiation challenging.
  • Accurate diagnosis is crucial to avoid inappropriate antidepressant treatment in BD, which can trigger mania.
  • A reliable biomarker is needed to distinguish BD from MDD before a manic episode occurs.

Purpose of the Study:

  • To investigate cortical thickness differences between patients with bipolar disorder (BD) and major depressive disorder (MDD) using magnetic resonance imaging (MRI).
  • To identify potential imaging biomarkers for differentiating BD from MDD.

Main Methods:

  • Cortical thickness was assessed via MRI in 18 BD patients, 56 MDD patients, and 54 healthy volunteers (HVs).
  • A general linear model was employed to identify significant differences in cortical thickness between diagnostic groups.
  • Statistical analysis controlled for age and sex.

Main Results:

  • The BD group exhibited significantly reduced cortical thickness in frontal, parietal, and posterior cingulate cortex regions compared to HVs.
  • Three clusters of reduced cortical thickness were identified in BD patients compared to MDD patients, overlapping with regions showing differences from HVs.
  • These cortical thickness differences were more pronounced in the bipolar I disorder (BD-I) subgroup compared to MDD.

Conclusions:

  • Distinct cortical thickness patterns exist between BD and MDD.
  • These findings represent a significant advancement towards developing an imaging-based diagnostic test for differentiating BD and MDD.