Journal
NEUROIMAGE-CLINICAL
Volume 30, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.nicl.2021.102686
Keywords
Age of onset; Clinical attribute; Subregional volume; Thalamus; Obsessive-compulsive disorder
Categories
Funding
- Basic Research Laboratory Program through the National Research Foundation of Korea (NRF) [2018R1A4A1025891, 2019R1A2B5B03100844]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) [2018R1A4A1025891, 2019R1A2B5B03100844]
- National Research Foundation of Korea [2018R1A4A1025891, 2019R1A2B5B03100844] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The study reported a reduced volume of the posterior thalamic nuclei in a large sample of medication-free OCD patients for the first time. The results suggest that the volume of posterior thalamic nuclei may reflect different pathophysiological mechanisms of OCD subtypes related to the age of onset. Further studies are needed to clarify the relationship between thalamic alterations and the onset age of OCD, particularly in pediatric samples.
Aim: Although the thalamus is a key structure in the pathophysiology of obsessive-compulsive disorder (OCD), reports regarding thalamic volume alterations in OCD patients have been inconsistent. Because the thalamus has a complex structure with distinct functions, we investigated subregional volume changes in the thalamus and their relationship with clinical attributes in a large sample of medication-free OCD patients. Methods: We collected T1-weighted magnetic resonance imaging data from 177 OCD patients and 152 healthy controls (HCs). Using FreeSurfer, we segmented the thalamus into 12 nuclei groups; subregional volumes were compared between groups using an analysis of covariance. The relationships between altered thalamic volumes and OC symptom severity and OCD onset age were investigated. Results: Compared to HCs, OCD patients showed a smaller volume of the left posterior thalamic nuclei. Other thalamic subregions did not show significant group differences. There was a significant negative correlation between the volume of the left posterior thalamic nuclei and the age of OCD onset but no significant correlation with OC symptom severity. Conclusions: This is the first study to report reduced volume of the posterior thalamic nuclei in a large sample of medication-free OCD patients. Our results suggest that the volume of posterior thalamic nuclei may reflect different pathophysiological mechanisms of OCD subtypes related to the age of onset. Additional studies with pediatric samples are required to clarify the relationship between thalamic alterations and the onset age of OCD.
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