Evaluation of the Temporal Evolution of Acute Spinal Cord Injury
| Autor: | Stanley A. Baldwin, Deborah A. Blades, John W. Wells, Val M. Runge, Stephen W. Scheff |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Cord
medicine.medical_treatment Gadolinium Rats Sprague-Dawley Atrophy Heterocyclic Compounds Edema Organometallic Compounds medicine Animals Radiology Nuclear Medicine and imaging Infusions Intravenous Spinal cord injury Spinal Cord Injuries medicine.diagnostic_test Gadoteridol Echo-Planar Imaging business.industry Laminectomy Magnetic resonance imaging General Medicine Image Enhancement medicine.disease Spinal cord Rats Disease Models Animal medicine.anatomical_structure Spinal Cord Acute Disease Female medicine.symptom business Nuclear medicine Follow-Up Studies medicine.drug |
| Zdroj: | INVESTIGATIVE RADIOLOGY. 32:105-110 |
| ISSN: | 0020-9996 |
| DOI: | 10.1097/00004424-199702000-00006 |
| Popis: | RATIONALE AND OBJECTIVES After receiving a controlled injury to the thoracic cord, five rats were examined on a 1.5-T magnetic resonance (MR) imaging system at regular intervals over 1 month to assess evolution of the injury. METHODS After the rats received pentobarbital anesthesia, a T10 laminectomy was performed on them, which exposed the dura over the dorsal surface of the spinal cord. With the animal placed in a New York University weight-drop device, a 10-g rod with a flat brass tip was dropped (free-fall) from a height of 50 mm to impact the cord. After injury, the incision was closed with suture material. Each animal was imaged on the day of injury, and at 7, 14, and 28 days after injury. Before contrast injection was administered, sagittal sections were obtained with T2 fast-spin echo and T1-spin echo technique. Each rat then received 0.3-mmol/kg gadoteridol (Gd HP-DO3A or ProHance) intravenously, with the T1 scan repeated. At 28 days, the animals were killed, and the cord was fixed and embedded in paraffin for histologic evaluation. RESULTS The intensity of cord enhancement in the region of injury, after intravenous (i.v.) contrast injection, was at a maximum on the day of injury, and it decreased in a steady fashion thereafter. The intensity was 11.7 +/- 0.6 on the day of injury, 9.7 +/- 2.6 on day 7, 6.3 +/- 5.3 on day 14, and 0.0 +/- 2.3 on day 28. The results on day 0 and 7 were statistically significant in terms of a difference from that on day 28, with a P value < 0.001. The length of cord injury, assessed postcontrast, also decreased in a steady fashion from the day of injury. The length of injury (in cm) was 1.1 +/- 0.1 on the day of injury, 0.5 +/- 0.2 on day 7, 0.3 +/- 0.1 on day 14, and 0.1 +/- 0.1 on day 28. The results on day 0 and 14 were statistically significant in terms of a difference from those at the next time point, with P values from < 0.01 to < 0.001. Visually, on T2 images, substantial edema was noted on day 0, with progression to focal cord atrophy and gliosis by day 28. CONCLUSIONS Acute spinal cord injury in a rat model is well visualized on pre- and postcontrast MR scans at 1.5 T. Observation of T2 changes and disruption of the blood-spinal cord barrier provide markers for temporal assessment of spinal cord injury in the rat model. |
| Databáze: | OpenAIRE |
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