Morphological and functional changes of the optic nerve following traumatic optic nerve injuries in rabbits

Xue,Fei; Wu,Kunming; Wang,Tianyou; Cheng,You; Jiang,Manjie; Ji,Junfeng

doi:10.3892/br.2016.567

February-2016 Volume 4 Issue 2

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February-2016 Volume 4 Issue 2

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Article

Morphological and functional changes of the optic nerve following traumatic optic nerve injuries in rabbits

Authors:
- Fei Xue
- Kunming Wu
- Tianyou Wang
- You Cheng
- Manjie Jiang
- Junfeng Ji
View Affiliations / Copyright

Affiliations: Department of Otolaryngology and Head Neck Surgery, Jinling Hospital, Nanjing, Jiangsu 210002, P.R. China
Pages: 188-192
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Published online on: January 7, 2016

https://doi.org/10.3892/br.2016.567
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Abstract

The aim of the present study was to investigate the morphological changes of the optic nerve following traumatic injuries and decompression at different times after injury, and to observe the changes of the visually evoked potentials, to identify the relevant associations between surgical opportunity and the clinical effect of traumatic optic nerve injuries. Rabbits were chosen as the animal model for the study. All the rabbits were randomly divided into five groups (A-E), representing the normal control, decompression in 48 h, in 1 week, in 2 weeks and non-decompression groups, respectively. The pattern reversal visual evoked potentials (P-VEP) and morphological changes of the optic nerve were observed. The P-VEP of each healthy rabbit revealed typical NPN contours, while NPN waves in the injured rabbits were low and flat. The latent period of the P-wave was lengthened and the amplitude was reduced. The differences of the latent period and amplitude pre- and post-trauma were statistically significant. The morphological changes were also assessed. In the normal control group, the astrocytes of the optic nerve exhibited a cylindrical form and were arranged evenly on the vertical section. The neural fibers were arranged neatly, were even following application of a dye, and the cross section exhibited a normal configuration of the blood vessel. For the 48-h decompression group, the arrangement of the astrocytes was even on the vertical section, and vacuoles, slight swelling of the nerve, exudation around the blood vessel and a small amount of astrocytic hyperplasia were observed in the damaged area. In the non-decompression group there were large areas of necrosis, clear nerve demyelination, serious exudation around the blood vessel and astrocytic hyperplasia were observed. In conclusion, the optic nerve decompression is beneficial to protect the visual function in indirect optic nerve injuries. Visual function may be improved by decompression in 48 h compared to 2 weeks. In order to prevent secondary axon injury and to protect visual functions, the decompression should be performed as soon as possible.

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Journals

International Journal of Molecular Medicine

International Journal of Oncology

Molecular Medicine Reports

Oncology Reports

Experimental and Therapeutic Medicine

Oncology Letters

Biomedical Reports

Molecular and Clinical Oncology

World Academy of Sciences Journal

International Journal of Functional Nutrition

International Journal of Epigenetics

Medicine International

Morphological and functional changes of the optic nerve following traumatic optic nerve injuries in rabbits

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