背景:甲状腺功能减退导致脑损伤的神经病理生理机制尚不清楚。低频波动(fALFF)的幅度分数已被确定为研究不同类型精神障碍中以特定频率发生的异常自发性大脑活动的可靠指标。然而,尚未研究甲状腺功能减退症特定频带中fALFF的变化。
方法:53例甲状腺功能减退患者和39例健康对照者(HCs)接受了甲状腺相关激素水平测试,神经心理学评估,和磁共振成像(MRI)扫描。标准频段(0.01-0.1Hz)中的fALFF,slow-4(0.027-0.073Hz),和慢-5波段(0.01-0.027Hz)进行分析。对fALFF之间的Pearson相关性进行了分析,甲状腺相关激素水平,甲状腺功能减退患者的神经心理学评分。
结果:与HC相比,在常规范围内,甲状腺功能减退组左舌回fALFF显著降低,颞中回(MTG),中央前回,钙的皮质,和右枕下回;在慢5带内,甲状腺功能减退组左舌回fALFF减少,MTG,颞上回,中央后回,和中央小叶,辅助运动区(SMA)和右额叶中回的fALFF增加;此外,左舌回内fALFF的常规和慢-5条带与促甲状腺激素水平呈负相关。
结论:在这项研究中,在检测fALFF值时,慢速5频段比标准频段具有更好的灵敏度。在标准和慢速5带中观察到舌回和MTG中的fALFF值降低,并且可能是甲状腺功能减退症的潜在神经影像学生物标志物。
背景:编号:ChiCTR2000028966。1月9日登记,2020,https://www。chictr.org.cn.
BACKGROUND: The neuropathophysiological mechanisms of brain damage underlying hypothyroidism remain unclear. Fractional amplitude of low-frequency fluctuations (fALFF) has been established as a reliable indicator for investigation of abnormal spontaneous brain activity that occurs at specific frequencies in different types of mental disorder. However, the changes of fALFF in specific frequency bands in hypothyroidism have not yet been investigated.
METHODS: Fifty-three hypothyroid patients and 39 healthy controls (HCs) underwent thyroid-related hormone levels tests, neuropsychological assessment, and magnetic resonance imaging (MRI) scans. The fALFF in the standard band (0.01-0.1 Hz), slow-4 (0.027-0.073 Hz), and slow-5 bands (0.01-0.027 Hz) were analyzed. An analysis of Pearson correlation was conducted between fALFF, thyroid-related hormone levels, and neuropsychological scores in hypothyroid patients.
RESULTS: Compared to HCs, within the routine band, hypothyroidism group showed significantly decreased fALFF in left lingual gyrus, middle temporal gyrus (MTG), precentral gyrus, calcarine cortex, and right inferior occipital gyrus; within the slow-5 band, the hypothyroidism group exhibited decreased fALFF in left lingual gyrus, MTG, superior temporal gyrus, postcentral gyrus, and paracentral lobule, and increased fALFF in supplementary motor area (SMA) and right middle frontal gyrus; additionally, fALFF in the left lingual gyrus within the routine and slow-5 bands were negatively correlated with the level of thyroid stimulating hormone.
CONCLUSIONS: In this study, the slow-5 frequency band exhibits better sensitivity than the standard band in detecting fALFF values. A decrease of fALFF values in the lingual gyrus and MTG was observed in both the standard and slow-5 bands and might present potential neuroimaging biomarkers for hypothyroidism.
BACKGROUND: No: ChiCTR2000028966. Registered 9 January, 2020, https://www.chictr.org.cn.