Neuroimaging biomarkers in bipolar disorder

Area of Science:

• Neuroscience
• Psychiatry
• Medical Imaging

Background:

• Bipolar disorder (BD) diagnosis and prognosis require objective biomarkers.
• Neuroimaging techniques offer a promising avenue for identifying such biomarkers.
• Current understanding suggests neurobiological models involving cortical-limbic dysregulation in BD.

Purpose of the Study:

• To review structural and functional neuroimaging studies in bipolar disorder.
• To explore neurobiological models of BD based on neuroimaging findings.
• To identify potential biomarkers for BD assessment.

Main Methods:

• Systematic review of structural and functional neuroimaging studies in bipolar disorder.
• Analysis of diffusion tensor imaging (DTI) for anatomical connectivity.
• Analysis of functional magnetic resonance imaging (fMRI) for functional connectivity.

Main Results:

• Neuroimaging suggests decreased volume and activity in dorsal brain structures in BD.
• Evidence points to reduced inhibition of the ventral-limbic network, enhancing emotional responses.
• Abnormal prefrontal-subcortical limbic connectivity identified via DTI and fMRI.

Conclusions:

• Cortical-limbic dysregulation and altered connectivity are key neurobiological features of BD.
• Neuroimaging biomarkers hold potential for improved diagnosis and prognosis of BD.
• Future research necessitates large, well-characterized patient samples for biomarker validation.