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KMID : 0607520170250020153
Korean Journal of Psychosomatic Medicine
2017 Volume.25 No. 2 p.153 ~ p.165
Decreased White Matter Structural Connectivity in Psychotropic Drug-Naive Adolescent Patients with First Onset Major Depressive Disorder
Suh Eun-Soo

Kim Ji-Hyun
Suh Sang-Il
Park So-Young
Lee Jeon-Ho
Lee Jong-Ha
Kim In-Seong
Lee Moon-Soo
Abstract
Objectives: Recent neuroimaging studies focus on dysfunctions in connectivity between cognitive circuits and emotional circuits: anterior cingulate cortex that connects dorsolateral orbitofrontal cortex and prefrontal cortex to limbic system. Previous studies on pediatric depression using DTI have reported decreased neural connectivity in several brain regions, including the amygdala, anterior cingulate cortex, superior longitudinal fasciculus. We compared the neural connectivity of psychotropic drug naive adolescent patients with a first onset of major depressive episode with healthy controls using DTI.

Methods: Adolescent psychotropic drug naive patients(n=26, 10 men, 16 women; age range, 13-18 years) who visited the Korea University Guro Hospital and were diagnosed with first onset major depressive disorder were registered. Healthy controls(n=27, 5 males, 22 females; age range, 12-17 years) were recruited. Psychiatric interviews, complete psychometrics including IQ and HAM-D, MRI including diffusion weighted image acquisition were conducted prior to antidepressant administration to the patients. Fractional anisotropy(FA), radial, mean, and axial diffusivity were estimated using DTI. FMRIB Software Library-Tract Based Spatial Statistics was used for statistical analysis.

Results: We did not observe any significant difference in whole brain analysis. However, ROI analysis on right superior longitudinal fasciculus resulted in 3 clusters with significant decrease of FA in patients group.

Conclusions: The patients with adolescent major depressive disorder showed statistically significant FA decrease in the DTI-based structure compared with healthy control. Therefore we suppose DTI can be used as a bio-marker in psychotropic drug-naive adolescent patients with first onset major depressive disorder.
KEYWORD
Adolescence, Diffusion tensor imaging, Depression, Drug-naive, First-onset
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