• Yang Liu, Hui-Qun Fu, Yan Wu, Zun-Shu Du, Bo-Ran Li, Xin Gao, Guan-Wen Lin, Shu-Yi Yang, and Tian-Long Wang.
• Department of Anesthesiology, Xuanwu Hospital, Capital Medical University, Beijing 100053, China.
• Chin. Med. J. 2020 Oct 16; 134 (3): 344-352.

BackgroundResting-state functional magnetic resonance imaging (rs-fMRI) is a promising method for the study of brain function. Typically, rs-fMRI is performed on anesthetized animals. Although different functional connectivity (FC) in various anesthetics on whole brain have been studied, few studies have focused on different FC in the aged brain. Here, we measured FC under three commonly used anesthesia methods and analyzed data to determine if the FC in whole brain analysis were similar among groups.MethodsTwenty-four male aged Wistar rats were randomly divided into three groups (n = 8 in each group). Anesthesia was performed under either isoflurane (ISO), combined ISO + dexmedetomidine (DEX) or α-chloralose (AC) according to the groups. Data of rs-fMRI was analyzed by FC in a voxel-wise way. Differences in the FC maps between the groups were analyzed by one-way analysis of variance and post hoc two-sample t tests.ResultsCompared with ISO + DEX anesthesia, ISO anesthesia caused increased FC in posterior brain and decreased FC in the middle brain of the aged rat. AC anesthesia caused global suppression as no increase in FC was observed.ConclusionISO could be used as a substitute for ISO + DEX in rat default mode network studies if the left temporal association cortex is not considered important.Copyright © 2021 The Chinese Medical Association, produced by Wolters Kluwer, Inc. under the CC-BY-NC-ND license.

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