18F-FDG PET显像观察强迫症患者内囊前肢毁损术后脑内环路的改变

目的　用1 8F 脱氧葡萄糖 (FDG)PET显像观察强迫症患者行内囊前肢毁损术后脑内环路的改变。方法　强迫症患者 8例 ,均于行内囊前肢毁损术前后分别行1 8F FDGPET显像 ,应用统计参数图 (SPM)对图像进行分析。结果　SPM分析显示内囊毁损术后左侧扣带回 (Brodmann 32区 )、边缘叶灰质、尾状核、丘脑背内侧核、扣带回 (Brodmann 2 4区 )、中额叶及下额叶白质及右侧壳核外白质、丘脑背内侧核、中额叶及下额叶白质葡萄糖代谢减低 (P <0 0 0 1)。结论　SPM分析可在活体上显示强迫症患者内囊前肢毁损术后扣带回、纹状体和丘脑的代谢明显减低 ,与手术使异常脑环路中断有关。

18 F-FDG PET study after bilateral capsulotomy in obsessive-compulsive disorder

Objective To assess the changes in regional glucose metabolism following bilateral capsulotomy in patients with medically intractable obsessive-compulsive disorder (OCD). Methods Eight OCD patients underwent bilateral anterior capsulotomy. 18F-fluorodeoxyglucose (FDG) PET data obtained before and after operation were subjected to statistical parameter mapping (SPM). Results The glucose metabolism decrease was found in the left cingulategyrus, caudatum, left and right thalamic nucleus medialis dorsalis nuclei, bilateral medial and inferior frontal white matter. Conclusion SPM analysis showed the significant change of cingulate-striatum-thalamic circuits in OCD patients after operation, and the findings implicate that the decreased cerebral metabolism in cingulate gyrus, striatum, and thalamus could be related to bilateral capsulotomy which blocks the abnormal functional connection of corticolimbic loop.