Cortical mean diffusivity is reliable in measuring brain abnormalities in drug-naïve essential tremor patients

• Published in: Clinical neurology and neurosurgery 2023-07, Vol.230, p.107796-107796, Article 107796
• Main Authors: Lee, Eek-Sung, Lee, Peter, Kim, Min Seung, Chang, Suk Ki, Jo, Sang Won, Lee, Seun Ah, Kang, Suk Yun
• Format: Article
• Language: English
• Subjects: Cortex (parietal); Cortical thickness; Dementia; Diffusion tensor imaging; Essential tremor; Family medical history; Handedness; Magnetic resonance imaging; Mean diffusivity; Medical imaging; Monte Carlo simulation; Neuroimaging; Neurology; Neurosurgery; Parkinson's disease; Pathogenesis; Pathophysiology; Tremor; Tremor (Muscular contraction); Variables
• ISSN: 0303-8467; 1872-6968
• DOI: 10.1016/j.clineuro.2023.107796

ABSTRACTObjectiveEssential tremor (ET) is a common movement disorder, but the pathogenesis is poorly understood. Several associated brain areas were reported with inconsistent results due to heterogeneous populations. It is necessary to analyze a more homogeneous patient group. MethodsWe recruited 25 drug-naïve ET patients and 36 age- and sex-matched controls. All participants were right-handed. ET. ET was defined according to diagnostic criteria of the Consensus Statement of the Movement Disorder Society on Tremor. ET patients were divided into sporadic (SET) and familial ET (FET). We assessed tremor severity in ET. The cortical microstructural changes were compared between ET patients and controls using mean diffusivity (MD) of diffusion tensor imaging, and cortical thickness. The correlation of tremor severity with the cortical MD and thickness were respectively analyzed. ResultsMD values were increased in the insular, precuneus, medial orbitofrontal, posterior, and isthmus cingulate and temporo-occipital areas in ET. In comparison between SET and FET, MD values were higher in the superior and caudal middle frontal, postcentral, and temporo-occipital regions in FET. The cortical thickness of ET patients was more increased in the left lingual gyrus and lower in the right bankssts gyrus. We could not find any correlation of tremor severity with the MD values in ET patients. Still, there was a positive correlation with the cortical thickness of the frontal and parietal areas. ConclusionsOur results support the idea that ET is a disorder that disrupts widespread brain regions and indicates that cortical MD may be more sensitive to measure brain abnormalities than cortical thickness.