Influencia del grado de lesión neurológica sobre la eficacia de la terapia celular en un modelo de traumatismo craneoencefálico grave / Influence of the level of neurological deficit on the efficacy of cell therapy in a model of severe traumatic brain injury

Objetivo: Determinar si el nivel de déficit neurológico influye en la eficacia de la terapia celular con células madre mesenquimales (CMM) de la médula ósea en un modelo experimental crónico de lesión cerebral traumática. Material y métodos: Se sometió a ratas Wistar adultas a un modelo de lesión cerebral traumática. Dos meses después, se clasificaron en función de su nivel de déficit neurológico mediante dos tests funcionales: Escala de valoración sensitivo-motora y Tiempo de permanencia en la zona interior (Video-Tracking-Box test, VTB test). Se inyectó suero salino solo o CMM en suero salino en el tejido cerebral dañado de los animales que obtuvieron la clasificación neurológica de lesión moderada o grave según el nivel permanente de su déficit funcional. Todos los animales se evaluaron durante los dos meses siguientes para determinar la posible eficacia de la administración de las CMM. Al finalizar el estudio, los animales se eutanasiaron y se estudiaron sus cerebros. Resultados: Se constata una recuperación funcional significativa en los animales con lesión moderada que recibieron las CMM, pero no en los animales con lesión grave cuando se compara con los controles. Conclusiones: Las conclusiones obtenidas sugieren que la gravedad de la lesión neurológica puede influir en la potencial eficacia de la terapia celular cuando es aplicada en una lesión cerebral traumática crónica (AU)

bjective: To study if the level of neurological deficit influences the efficacy of cell therapy with bone marrow stromal cells (BMSC), in an experimental model of chronic traumatic brain injury (TBI). Material and methods: Adult Wistar rats were subjected to a model of traumatic brain injury. Two months later they were classified according to their level of neurological deficit. For that, two functional tests: Scale of sensory- motor assessment and time spent in the inner zone in the Video-Tracking-Box test, were used. Saline alone or BMSC in saline was injected into the damaged brain tissue of animals suffering a permanent level of functional deficit classified as moderate or severe. All experimental groups were evaluated during the next two months to determine the potential effectiveness of the intracerebral administration of BMSC. At the end of the study animals were euthanized and their brains were studied. Results: The results show a significant functional recovery in animals with moderate injury who received BMSC, but there was no significant recovery in animals with severe traumatic brain injury when compared with controls. Conclusion: The severity of neurologic injury may influence the potential efficacy of cell therapy applied to chronic TBI (AU)

Intracranial trauma in a dog due to being "swung" at birth.

A male Labrador Retriever neonate presented for evaluation 8 hours after birth because of the onset of generalized seizure activity. The neonate was one of 8 puppies delivered over a 19-hour period to a 4-year-old female Labrador Retriever at an assistance dog breeding colony. Uterine and fetal heart monitoring were performed during the first and second stages of labor; secondary uterine inertia was diagnosed 10 hours after the onset of stage-1 labor. In addition to standard medical therapy, manual assistance was provided for the delivery of all but the second puppy (feathering, pulling, elevating forequarters, abdominal compression). The puppy presented was the third puppy born. At birth, resuscitation efforts were instituted because of a lack of spontaneous breathing and bradycardia. In an effort to remove amniotic fluid from the airways, the puppy was "swung" by an experienced attendee in an arch from mid-abdomen height to knee height while cradled in both hands with the head stabilized. Initial evaluation of the puppy revealed normal blood glucose and no ultrasonographic evidence of hydrocephalus. Because of continued seizure activity, euthanasia and necropsy were elected. At necropsy, there was gross evidence of subdural hematoma formation. Subsequent histopathology of the brain, liver, lung, spleen, small intestine, colon, and kidney revealed subdural and intracerebral hemorrhage. Findings were consistent with high-velocity deceleration trauma ("shaken baby syndrome"). Traditional neonatal resuscitation via "swinging" is a dangerous and potentially lethal practice capable of inducing significant brain trauma in the canine neonate.

Sequential magnetic resonance imaging of an intracranial hematoma in a dog.

An 8-year-old Yorkshire terrier developed acute onset coma and seizure after cranial trauma. Intracranial hemorrhage was suspected from the clinical signs and history. Low-field magnetic resonance (MR) imaging revealed a round mass within the right cerebral hemisphere, compressing the right lateral ventricle and displacing the longitudinal fissure to the left. The lesion was hypointense on T1-weighted images and hyperintense on T2-weighted images, consistent with an acute hemorrhage. MR imaging was performed every 24 h for 6 days from 1 h after the injury, and then on day 14 of hospitalization. With time, the signal intensity changed to hyperintense on Ti-weighted images. On T2-weighted images the center of the mass changed to hypointense, and then to hyperintense with a hypointense rim. These changes of signal intensity were related to hemoglobin oxidation.

Traumatic intracerebral hematoma in a dog: MR images and clinical findings.

A nine-year-old, male, mongrel dog was unsteady after falling down a set of stairs. The dog exhibited a mildly abnormal gait 2 days after injury, and was not able to stand, with spasticity of the right limbs, 4 days after injury. MR imaging revealed a clearly demarcated mass on the top of the left lateral ventricle that showed mild hyperintensity on T1-weighted images and hyperintensity on T2-weighted images. The authors diagnosed the dog as having a traumatic intracerebral hematoma. This type of case, in which the clinical signs deteriorated due to edema associated with hematoma, is extremely rare.