目的 探讨不同戒断时间对海洛因成瘾者大脑静息态下功能网络的影响.方法 16名强制戒断11～13个月的海洛因成瘾者(PA12组)、20名强制戒断5～7个月的海洛因成瘾者(PA6组)纳入静息态fMRI研究.运用图论理论构建小世界脑网络,比较两组海洛因成瘾者小世界特性及核心节点特性,分析核心节点与戒断时间的相关性.结果 两组脑网络均具有小世界特性(γ≈1、λ》1)且差异无统计学意义(P＞0.05);PA12组较PA6组脑网络的左侧中央前回及左侧海马旁回节点介数值降低,左侧楔叶、左侧颞极及右侧枕中回节点介数值升高(P均＜0.05).左侧中央前回(r=0.52,P=0.001)、左侧海马旁回(r=0.49,P=0.002)节点介数值均与戒断时间呈负相关,右侧枕中回节点介数值与戒断时间呈正相关(r=0.49,P=0.003).结论 戒断5～7个月后,海洛因成瘾者大脑网络小世界拓扑结构趋于稳定;长期戒断有助于降低成瘾者对毒品的相关记忆和潜在觅药行为,恢复视觉空间注意能力.%Objective To investigate the effects of different abstinent duration on brain functional network of heroin addicts at resting state.Methods Sixteen heroin addicts during protracted abstinence for 11-13 months (PA12 group) and twenty heroin addicts during protracted abstinence for 5-7 months (PA6 group) were recruited in the resting-state functional MRI study.Graph theoretical methods were applied to construct topological organization of whole brain network and nodes betweenness of the networks in all subjects,and the between-group differences were analyzed.The correlation of the node betweenness with the abstinence duration was conducted.Results There was no significant difference (P＞0.05) in the small world characteristic (γ≈1,λ》1) between two groups.Compared with the PA6 group,the PA12 group demonstrated significantly decreased nodal betweenness in regions of left parahippocampal gyrus,left precentral gyrus,and significantly enhanced nodal betweenness in regions of the left cuneus,left temporal and right middle occipital gyrus (all P＜0.05).Moreover,the betweenness of the left precentral gyrus (r =-0.52,P =0.001) and parahippocampal gyrus (r=-0.49,P=0.002) were negatively related with the abstinence duration,the betweenness of the right middle occipital was positively correlated with the abstinence duration (r=0.49,P=0.003).Conclusion The brain network small world topology of heroin addicts tend to be stable after 5-7 months of abstinence.Long-term abstinence may minimize the addicfs memory of drugs and potential drug seeking behavior,and recover addicts' visual spatial attention function.
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