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Radiographic, MRI and Histopathologic Assessment to Standardize Canine Spinal Cord Injury Model  

Seong, Yun-Sang (Department of Surgery, College of Veterinary Medicine, Kyungpook National University)
Yun, Sung-Ho (Department of Surgery, College of Veterinary Medicine, Kyungpook National University)
Park, Jai-Soon (Department of Surgery, College of Veterinary Medicine, Kyungpook National University)
Kim, Hee-Kyung (Department of Diagnostic Radiology and Molecular Medicine, Kyungpook National University)
Chang, Yong-Min (Department of Diagnostic Radiology and Molecular Medicine, Kyungpook National University)
Ku, Sae-Kwang (Department of Anatomy and Histology, College of Oriental Medicine, Daegu Haany University)
Park, Hyun-Jeong (Department of Veterinary Radiology, College of Veterinary Medicine, Jeju National University)
Jang, Kwang-Ho (Department of Surgery, College of Veterinary Medicine, Kyungpook National University)
Publication Information
Journal of Veterinary Clinics / v.27, no.5, 2010 , pp. 546-552 More about this Journal
Abstract
Previous studies could not offer available guideline to decide size of balloon and grade of injury before induction of spinal cord injury (SCI) because grade of SCI was assessed after inserting a catheter and each experimental animal were different in body size and weight as well as in species. This study was performed to provide guideline for standardized SCI model. Eight healthy adult beagle dogs that had 8 mm of spinal canal height were assigned to four groups according to the diameter of balloon and compression time: 4 mm/3hrs, 4 mm/6hrs, 4 mm/12hrs and 6 mm/3hrs group. Radiography was performed to standardize between experimental animal and balloon before selecting balloon diameter to induce SCI. Behaviors outcomes, somatosensory evoked potentials (SEPs), magnetic resonance imaging (MRI) and histopathological examination were evaluated. Behaviors outcomes and SEPs were not available to assess grade of SCI and those only indicate SCI. The damaged area was revealed clear hyperintensity on STIR image and T2WI after induction of SCI. The hyperintense area on MRI was cranially and caudally expanded with increasing of the diameter of balloon or the compression time. Well corresponded to expanding of hyperintense area on MRI, the damaged region and the numbers of caspase-3 and PARP immunoreactive cells were increased on histopathological findings. Therefore, these results will be considered fundamental data to induce standardized SCI model in experimental animal that has various weight and size.
Keywords
spinal cord injury; balloon; compression; MRI; dog;
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