Periódicos Brasileiros em Medicina Veterinária e Zootecnia

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Mielomalácia hemorrágica ascendente secundária à protrusão de disco intervertebral em cão

Schafrum Macedo, AlineBarbosa Silva, Renatodos Santos Dal-Bó, ÍsisGutierrez de Gutierrez, LetíciaDriemeier, DavidMeller Alievi, Marcelo

Background: Myelomalacia is a multifocal syndrome that causes hemorrhagic infarction of the spinal cord that can occur as a sequel to acute spinal cord injury. It occurs as a consequence of acute spinal cord trauma, usually by extrusion of intervertebral disc in the thoracolumbar spine, affecting up to 10% of dogs with acute paralysis and deep pain loss in the pelvic limbs due to disc disease. This disease may be focal or diffuse; the diffuse form is typically associated with cranial and caudal migration of neurologic signs and is often fatal. The mechanical lesion to the spinal cord triggers secondary injury mediated by the existence of oxygen free radicals, alterations in the concentrations of neurotransmitters ions and amino acids, and it results in the reduction of the spinal cord blood fl ow, ischemia and progressive cranial and caudal necrosis to the focus of the initial injury.Case: A 5-year-old Dachshund male intact dog weighting 8 kg was referred to the Veterinary Teaching Hospital of the Federal University of Rio Grande do Sul (HCV-UFRGS) with initial complaint of acute paralysis of the hind limbs for two days. On clinical examination there was paraplegia, absence of deep pain in the pelvic limbs, with decreased patellar, sciatic and tibial cranial refl exes. The anal sphincter was relaxed and the bladder was easily expressed. The panniculus refl ex was intact up to t

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