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Related Concept Videos

Bipolar Disorder01:30

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Bipolar disorder is a chronic mental health condition marked by significant mood fluctuations, including episodes of mania and depression. Elevated energy levels, heightened mood or irritability, impulsive behavior, reduced sleep needs, rapid speech, racing thoughts, inflated self-esteem, and distractibility characterize mania. Individuals with bipolar disorder often alternate between depressive and manic states, with periods of emotional stability lasting an average of six months to a year.
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Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
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Structural abnormalities in bipolar euthymia: a multicontrast molecular diffusion imaging study.

Erick Jorge Canales-Rodríguez1, Edith Pomarol-Clotet1, Joaquim Radua2

  • 1Fundación para la Investigación y Docencia Maria Angustias Giménez (FIDMAG) Germanes Hospitalàries, Barcelona; Centro de Investigación Biomédica en Red de Salud Mental, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Madrid, Spain.

Biological Psychiatry
|November 9, 2013
PubMed
Summary

This study reveals widespread axonal pathology in bipolar disorder, affecting both gray and white matter, including subcortical structures. These diffusion imaging findings suggest a broader tissue damage pattern than previously understood.

Keywords:
Bipolar disorderdiffusion tensor imaging (DTI)euthymiahigh angular resolution diffusion imaging (HARDI)magnetic resonance imaging (MRI)whole-brain statistical analysis

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Area of Science:

  • Neuroimaging
  • Bipolar Disorder Research
  • Diffusion Tensor Imaging

Background:

  • Decades of MRI research in bipolar disorder show inconsistent findings between structural and functional imaging.
  • Structural MRI suggests gray matter reductions in specific cortical areas.
  • Functional MRI indicates subcortical dysfunction, necessitating further investigation with advanced MRI techniques.

Purpose of the Study:

  • To investigate widespread brain tissue abnormalities in euthymic bipolar disorder patients.
  • To compare water diffusion properties in brain tissues between patients and healthy controls.
  • To explore the utility of advanced diffusion imaging in understanding bipolar disorder pathology.

Main Methods:

  • Whole-brain high angular resolution molecular diffusion imaging was applied.
  • Key diffusion metrics including fractional anisotropy and mean diffusivity were analyzed.
  • A cohort of 40 euthymic bipolar disorder patients and 40 healthy controls were studied.

Main Results:

  • Abnormalities were detected in white matter tracts (e.g., corpus callosum, cingulum bundle).
  • Cortical gray matter alterations were observed in regions like the medial frontal cortex and insula.
  • Subcortical structures, including the hippocampus, thalamus, and caudate nucleus, showed abnormalities across multiple diffusion contrasts.

Conclusions:

  • Findings indicate a broader pattern of axonal pathology in bipolar disorder than previously recognized.
  • Subcortical abnormalities align with prior functional imaging findings, suggesting cytoarchitectonic underpinnings.
  • Diffusion metrics suggest tissue volume loss or altered membrane permeability, potentially linked to mitochondrial dysfunction or neuroinflammation.