单位:[1]Department of Radiology, Beijing Friendship Hospital, Capital Medical University,Beijing, China医技科室影像中心放射科首都医科大学附属北京友谊医院[2]Department of Nephrology, Faculty of Kidney Diseases, Beijing Friendship Hospital,Capital Medical University, Beijing, China临床科室肾脏内科肾脏内科首都医科大学附属北京友谊医院
Background: Altered cerebral blood flow (CBF) and amplitude of low-frequency fluctuation (ALFF) have been reported in hemodialysis patients. However, neurovascular coupling impairments, which provide a novel insight into the human brain, have not been reported in hemodialysis patients. Methods: We combined arterial spin labeling (ASL) and blood oxygen level dependent (BOLD) techniques to investigate neurovascular coupling alterations and its relationships with demographic and clinical data in 46 hemodialysis patients and 47 healthy controls. To explore regional neuronal activity, ALFF was obtained from resting-state functional MRI. To measure cerebral vascular response, CBF was calculated from ASL. The across-voxel CBF-ALFF correlations for global neurovascular coupling and CBF/ALFF ratio for regional neurovascular coupling were compared between hemodialysis patients and healthy controls. Two-sample t-tests were used to compare the intergroup differences in CBF and ALFF. Multiple comparisons were corrected using a voxel-wise false discovery rate (FDR) method (P < 0.05). Results: All hemodialysis patients and healthy controls showed significant across-voxel correlations between CBF and ALFF. Hemodialysis patients showed a significantly reduced global CBF-ALFF coupling (P = 0.0011) compared to healthy controls at the voxel-level. Of note, decreased CBF/ALFF ratio was exclusively located in the bilateral amygdala involved in emotional regulation and cognitive processing in hemodialysis patients. In hemodialysis patients, the decreased CBF (right olfactory cortex, anterior cingulate gyrus and bilateral insula) and ALFF (bilateral precuneus and superior frontal gyrus) were mainly located in the default mode network and salience network-related regions as well as increased CBF in the bilateral thalamus. Conclusions: These novel findings reveal that disrupted neurovascular coupling may be a potential neural mechanism in hemodialysis patients.
基金:
National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [61527807, 81701644, 61801311]; Beijing Municipal Administration of Hospitals Mission Plan [SML20150101]; Beijing Scholars Program [(2015) 160]; Beijing Natural Science FoundationBeijing Natural Science Foundation [7172064, 7162048, 7182044]; Beijing Municipal, Administration of Hospitals [PX2018001, QML20180103]; Beijing Friendship Hospital, Capital Medical University [YYZZ2017B01]