[Dynamic observation of brainstem auditory evoked potential and pathological changes of the brain after closed brain injuries in rats].
OBJECTIVE
To investigate the dynamic experiences of pathological changes in brain and the injured role of brainstem auditory evoked potential (BAEP) after closed Mild Traumatic Brain Injury (MTBI) in rat.


METHODS
A closed diffuse brain injury model was successfully produced in rat by hit the parietal bone with a spring-droved steel stick. The auditory brainstem response evoked by click at 50Hz stimulating frequency were recorded at pre-trauma, 15 min and 1, 3, 6, 12 h and 1, 2, 4, 7, 10, 14, 21 d after brain injury. The pathological changes of brain were observed under light microscope and the brain edema was detected by wet weight/dry weight rations.


RESULTS
The I-V, III-V of BAEP wave inter peak latency (IPL) in MTBI group increased immediately in 15 minutes after injury. The III, V wave peak latency (PL) and I-V, III-V wave IPL became longer than the pre-trauma level in 6, 12 h post-injury (P<0.05). The III, V wave PL and I - III, I - V, III - V wave IPL became longer than the pre-trauma level in 1, 2 d after injury (P < 0.001), the BAEP retuned to normal level in 14 d after brain injury. At 15 minutes after injury, the water content in brain increased and met its peak in 1 d, decreased gradually in 4 d, then decreased slowly and returned to normal level in 10 d after injury.


CONCLUSIONS
The regular changes of BAEP could be an objective tool for evaluating hearing dysfunction after closed mild diffuse traumatic brain injury.
Wu
Jing-Ji
JJ
Department of Forensic Pathology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu 610041, China. wjj972@163.com
Liu
Ming
M
Yan
Hong-Tao
HT
Zheng
Zhong
Z
Wang
Ye
Y
Li
Bin
B
Liao
Zhi-Gang
ZG
D000818:Animals; D001308:Auditory Perceptual Disorders / Q000175:diagnosis* / Q000209:etiology; D001921:Brain / Q000473:pathology*; D001929:Brain Edema / Q000209:etiology / Q000473:pathology*; D001930:Brain Injuries / Q000150:complications / Q000503:physiopathology*; D001933:Brain Stem / Q000293:injuries / Q000503:physiopathology; D004195:Disease Models, Animal; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D008297:Male; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley