title: High-field MRI reveals an acute impact on brain function in survivors of the magnitude 8.0 earthquake in China.
abstract: Besides the enormous medical and economic consequences, national disasters, such as the Wenchuan 8.0 earthquake, also pose a risk to the mental health of survivors. In this context, a better understanding is needed of how functional brain systems adapt to severe emotional stress. Previous animal studies have demonstrated the importance of limbic, paralimbic, striatal, and prefrontal structures in stress and fear responses. Human studies, which have focused primarily on patients with clinically established posttraumatic stress disorders, have reported abnormalities in similar brain structures. At present, little is known about potential alterations of brain function in trauma survivors shortly after traumatic events. Here, we show alteration of brain function in a cohort of healthy survivors within 25 days after the Wenchuan earthquake by a recently discovered method known as "resting-state" functional MRI. The current investigation demonstrates that regional activity in frontolimbic and striatal areas increased significantly and connectivity among limbic and striatal networks was attenuated in our participants who had recently experienced severe emotional trauma. Trauma victims also had a reduced temporal synchronization within the "default mode" of resting-state brain function, which has been characterized in humans and other species. Taken together, our findings provide evidence that significant alterations in brain function, similar in many ways to those observed in posttraumatic stress disorders, can be seen shortly after major traumatic experiences, highlighting the need for early evaluation and intervention for trauma survivors.
authors.affiliation: Huaxi MR Research Center, Department of Radiology, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu 610041, China.
authors.forename: Su
authors.initials: S
authors.lastname: Lui
authors.forename: Xiaoqi
authors.initials: X
authors.lastname: Huang
authors.forename: Long
authors.initials: L
authors.lastname: Chen
authors.forename: Hehan
authors.initials: H
authors.lastname: Tang
authors.forename: Tijiang
authors.initials: T
authors.lastname: Zhang
authors.forename: Xiuli
authors.initials: X
authors.lastname: Li
authors.forename: Dongming
authors.initials: D
authors.lastname: Li
authors.forename: Weihong
authors.initials: W
authors.lastname: Kuang
authors.forename: Raymond C
authors.initials: RC
authors.lastname: Chan
authors.forename: Andrea
authors.initials: A
authors.lastname: Mechelli
authors.forename: John A
authors.initials: JA
authors.lastname: Sweeney
authors.forename: Qiyong
authors.initials: Q
authors.lastname: Gong
mesh_terms: D000328:Adult; D001921:Brain / Q000503:physiopathology*; D002681:China; D004190:Disasters; D055866:Earthquakes; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008875:Middle Aged; D013315:Stress, Psychological / Q000503:physiopathology*