Aberrant functional connectivity density in patients with treatment-refractory obsessive-compulsive disorder: a pilot study

• Published in: Journal of international medical research Vol. 47; no. 6; pp. 2434 - 2445
• Main Authors: Shan, Pei Wei, Liu, Wei, Liu, Caixing, Han, Yunyi, Wang, Lina, Chen, Qinggang, Tian, Hongjun, Sun, Xiuhai, Luan, Shuxin, Lin, Xiaodong, Jiang, Deguo, Zhuo, Chuanjun
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.06.2019; Sage Publications Ltd; SAGE Publishing
• Subjects: Adult; Brain - physiopathology; Brain Mapping - methods; Case-Control Studies; Clinical Research Reports; Female; Follow-Up Studies; Frontal Lobe - physiopathology; Humans; Image Processing, Computer-Assisted - methods; Information processing; Magnetic Resonance Imaging - methods; Male; Neuroses; Obsessive compulsive disorder; Obsessive-Compulsive Disorder - classification; Obsessive-Compulsive Disorder - etiology; Obsessive-Compulsive Disorder - metabolism; Obsessive-Compulsive Disorder - pathology; Pilot Projects; Prefrontal Cortex - physiopathology; Prognosis; functional connectivity density; left middle temporal gyrus; information processing; Treatment-refractory obsessive-compulsive disorder; functional connection number; aberrant functional connectivity
• ISSN: 0300-0605; 1473-2300
• DOI: 10.1177/0300060518807058

Objective Functional connectivity (FC) is altered in patients with obsessive-compulsive disorder (OCD). Most previous studies have focused on the strength of FC in patients with OCD; few have examined the number of functional connections in these patients. The number of functional connections is an important index for assessing aberrant FC. In the present study, we used FC density (FCD) mapping to explore alterations in the number of functional connections in patients with treatment-refractory OCD (TROCD) using the FCD index. Methods Twenty patients with TROCD and 20 patients with OCD in clinical remission were enrolled in the study. Global FCD (gFCD) was adopted to compare the differences between the two groups of patients. Results The gFCD in the left middle temporal gyrus was lower in the patients with TROCD than in those with remitted OCD, suggesting that decreased information processing ability may play a significant role in TROCD. Conclusion The left middle temporal gyrus is a key component of the emotional processing circuit and attentional processing circuit. Decreased information processing ability in this brain region may play a significant role in TROCD; however, further well-designed follow-up studies are needed to support this hypothesis.