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  • Title: Prevalence and Risk Factors for Presumptive Ascending/Descending Myelomalacia in Dogs after Thoracolumbar Intervertebral Disk Herniation.
    Author: Balducci F, Canal S, Contiero B, Bernardini M.
    Journal: J Vet Intern Med; 2017 Mar; 31(2):498-504. PubMed ID: 28144987.
    Abstract:
    BACKGROUND: Ascending/descending myelomalacia (ADMM) is a severe complication of thoracolumbar intervertebral disk herniation (TL-IVDH) in dogs. HYPOTHESIS/OBJECTIVES: To investigate the prevalence and risk factors for ADMM in nonambulatory dogs with surgically treated TL-IVDH. ANIMALS: Six-hundred and fifty-two client-owned dogs evaluated for TL-IVDH that underwent decompressive spinal surgery. METHODS: Retrospective medical record review from February 2007 through December 2015. RESULTS: Thirteen dogs developed ADMM, with an overall prevalence of 2.0%. The prevalence of ADMM was 0% in dogs with neurological signs graded 1 or 2 at admission or before magnetic resonance imaging (MRI) or surgical procedures, 0.6% in dogs with neurological signs graded 3, 2.7% in dogs with neurological signs graded 4, and 14.5% in dogs with neurological signs graded 5. Age (<5.8 years), neurological status (grade 5), site of disk herniation (L5-L6), duration of clinical signs before becoming nonambulatory (<24 hours), detection of intramedullary T2-weighted (T2W) hyperintensity, and a T2 length ratio >4.57 were significant risk factors in the univariate analysis for development of ADMM. CONCLUSIONS AND CLINICAL IMPORTANCE: The factors identified in this study may be useful for the prediction of ADMM. Multicenter studies with a higher number of dogs with ADMM are required to confirm these data.
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