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PT  - JOURNAL ARTICLE
AU  - Purdy, Phillip D.
AU  - White, Charles L.
AU  - Baer, Donna L.
AU  - Frawley, William H.
AU  - Reichard, R. Ross
AU  - Pride, G. Lee
AU  - Adams, Christina
AU  - Miller, Susan
AU  - Hladik, Christa L.
AU  - Yetkin, Zerrin
TI  - Percutaneous Translumbar Spinal Cord Compression Injury in Dogs from an Angioplasty Balloon: MR and Histopathologic Changes with Balloon Sizes and Compression Times
DP  - 2004 Sep 01
TA  - American Journal of Neuroradiology
PG  - 1435--1442
VI  - 25
IP  - 8
4099  - http://www.ajnr.org/content/25/8/1435.short
4100  - http://www.ajnr.org/content/25/8/1435.full
SO  - Am. J. Neuroradiol.2004 Sep 01; 25
AB  - BACKGROUND AND PURPOSE: Our previous model of spinal cord injury (SCI) included six dogs undergoing 30-minute compression with a balloon in the subarachnoid space. We determined whether various balloon sizes and compression times creates a gradation of injuries.METHODS: In 17 dogs (including our original six), angioplasty balloons 2, 4, or 7 mm in diameter (2 cm long) were inflated at T6 for 30, 120, or 240 minutes. T1- and T2-weighted, gadolinium-enhanced, and short-tau inversion recovery (STIR) MR images were obtained at 1.5 T. Spinal canal occlusion (SCO) was measured as balloon area-spinal cord area. Hematoxylin-eosin and beta amyloid precursor protein staining were performed to demonstrate hemorrhage and axonal injury, respectively. Injuries were scored as mild, moderate, or severe. Trends were assessed with one-way analysis of variance.RESULTS: SCO was 12.5–20% for 2-mm balloons, 28–56% for 4 mm, and 62–82% for 7 mm. No abnormalities were seen with SCO &amp;lt;30%. T1- and T2-weighted images had the poorest diagnostic performance; STIR images were best for predicting hemorrhage and axonal injury. Hemorrhage was demonstrated more frequently than was axonal injury. SCO (P &amp;lt; .0001) and hemorrhage (P = .002) significantly increased with balloon size. Longer inflation times tended to increase injuries for a given size, but differences were not significant.CONCLUSION: Compression injuries depended on the level of SCO. The compression times tested had less effect than the degree of compression. The value of 1.5-T MR imaging varied with the sequence and improved with contrast enhancement. STIR images showed SCIs not otherwise detected.