三维动脉自旋标记技术评价抑郁合并高血压患者脑血流灌注

Cerebral blood flow measurements in patients with comorbid hypertension and depression using 3D arterial spin labeling

目的:应用三维伪连续动脉自旋标记技术(3D pseudocontinuous arterial spin labeling,3D pc ASL),探讨抑郁合并高血压患者脑血流灌注特点,并分析其与抑郁程度的相关性。方法:16例临床诊断为抑郁的患者为抑郁组(男3例、女13例,年龄42~72岁),16例高血压患者为高血压组(男3例、女13例,年龄41~68岁),16例抑郁合并高血压患者为共病组(男3例、女13例,年龄45~74岁),16例健康者为对照组(男3例、女13例,年龄43~68岁)。使用GE 3.0T磁共振扫描3D pc ASL序列并自动生成脑血流图,使用统计参数图(statistical parametric mapping,SPM8)软件对脑血流图进行预处理、空间标准化和平滑。使用方差分析比较4组之间脑血流灌注差异,提取脑血流灌注减低区的平均脑血流值与17项汉密尔顿抑郁量表(Hamilton depression scale,HAMD-17)进行相关分析。结果:与对照组比较,共病组可见多个脑区出现脑血流灌注减低,包括双侧额上回、双侧额中回、双侧额下回、右侧顶上回、右侧顶下回、右侧缘上回、左侧尾状核、左侧岛叶,差异有统计学意义。与对照组比较,抑郁组脑血流灌注在双侧额中回出现下降趋势,但差异无统计学意义;高血压组未出现脑血流灌注异常。与抑郁组比较,共病组在双侧额叶和右侧缘上回脑血流灌注减低;与高血压组比较,共病组在左侧额中回脑血流灌注减低。相关分析显示各灌注减低区平均脑血流值与HAMD-17量表评分未见明显相关。结论:尽管抑郁患者、高血压患者未见脑部脑血流灌注减低,但共病患者存在多个脑区脑血流灌注减低,提示高血压可能对脑血流低灌注有协同促进作用。

Objective: To evaluate cerebral blood flow (CBF) in patients with comorbid hypertension in depression using 3D pseudocontinuous arterial spin labeling (3D pcASL) and to compare the dif- ferences of CBF values in depression, hypertension, and comorbid hypertension between depression and healthy control groups. To investigate the correlation between CBF values and degrees of depression. Methods: Sixteen patients with depression (depression group, 3 males and 13 females, age range of 42- 72 years old), sixteen patients with hypertension (hypertension group, 3 males and 13 females, age range of 41-68 years old), sixteen patients with comorbid hypertension in depression (comorbidity group, 3 males and 13 females, age range of 45-74 years old), and sixteen healthy controls (control group, 3 males and 13 females, age range of 43-68 years old) were recruited. 3D pcASL sequence was performed by GE 3.0T magnetic resonance scanner and CBF map was generated automatically. Statistical parametric mapping (SPM8) was performed to preprocess the CBF map, which was spatially normalized and smoothed. Comparison of the CBF values among the four groups was conducted by ANOVA. Correlation between the average CBF values in areas of decreased CBF and Hamilton depression scale (HAMD-17) was investigated. Results: The patients with comorbid hypertension in depression demonstrated lower CBF in bilateral superior frontal gyri, middle frontal gyri, inferior frontal gyri, right superior parietal gyrus, right inferior parietal gyrus, right supramarginal gyrus, left caudate nucleus and left insula lobe in comparison with the controls. Compared with control group, CBF values decreased in bilateral frontal lobes, but did not reach statistical significance. There were no significant differences of CBF values between the patients with hypertension and control subjects. Compared with depression, the patients with comorbid hypertension in depression showed lower CBF values in bilateral frontal lobes and right supramarginal gyrus. Compared with hypertension, lower CBF values in left middle frontal gyrus in the patients with comorbid hypertension in depression were shown. Correlation analysis indicated that no correlation between CBF values and scores of HAMD-17 was shown. Conclusion: Although there were no significant decreases of CBF values in patients with depression and hypertension, regional hypoperfusions were observed in patients with comorbid hypertension in depression. Hypertension might play a sy- nergistic action on cerebral hypoperfusion in patients with comorbid hypertension in depression.