title: Characteristics of a rat model of an open craniocerebral injury at simulated high altitude.
abstract: To establish a rat model of an open craniocerebral injury at simulated high altitude and to examine the characteristics of this model. Rats were divided randomly into a normobaric group and a high-altitude group and their corresponding control groups. A rat model of an open craniocerebral injury was established with a nail gun shot. Simulated high-altitude conditions were established with a hypobaric chamber at 0.6 ATA to mimic pressure at an altitude of 4000 m. Mortality, brain water content (BWC), Evans blue content, pathology, regional cerebral blood flow (rCBF), partial pressure of brain tissue oxygen (PbtO2), and brainstem auditory-evoked potential were observed after injury. The mortality of the high-altitude group was significantly greater than that of the normobaric group within 72 h after injury (P<0.05). BWC and Evans blue content increased by 48 h after injury (P<0.05); pathological changes in damaged brains were more serious. In contrast, rCBF and PbtO2 had decreased markedly by 72 h (P<0.01); brainstem auditory-evoked potential values were significantly prolonged (P<0.05). Moreover, an inverse correlation between rCBF and BWC and a positive correlation between rCBF and PbtO2 were found. The rat model of an open craniocerebral injury at simulated high altitude can be established successfully using a nail gun shot and a hypobaric chamber. The injury characteristics at high altitude were more serious, rapid, and prolonged than those in the normobaric group.
authors.affiliation: aDepartment of Neurosurgery, Southwest Hospital, Third Military Medical University, Chongqing bThe 41 Hospital of PLA, Tibet, People's Republic of China.
authors.forename: An-Yong
authors.initials: AY
authors.lastname: Yu
authors.forename: Quan-Hong
authors.initials: QH
authors.lastname: Xu
authors.forename: Sheng-Li
authors.initials: SL
authors.lastname: Hu
authors.forename: Fei
authors.initials: F
authors.lastname: Li
authors.forename: Yu-Jie
authors.initials: YJ
authors.lastname: Chen
authors.forename: Yi
authors.initials: Y
authors.lastname: Yin
authors.forename: Gang
authors.initials: G
authors.lastname: Zhu
authors.forename: Jiang-Kai
authors.initials: JK
authors.lastname: Lin
authors.forename: Hua
authors.initials: H
authors.lastname: Feng
mesh_terms: D000531:Altitude; D000818:Animals; D001274:Atmospheric Pressure; D001921:Brain / Q000098:blood supply; D004195:Disease Models, Animal; D016057:Evoked Potentials, Auditory, Brain Stem; D020197:Head Injuries, Penetrating / Q000401:mortality / Q000473:pathology* / Q000503:physiopathology*; D008297:Male; D051381:Rats; D017208:Rats, Wistar