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Background  Hemorrhage in the spinal canal leads to further damage of the spinal cord influencing outcome in dogs with intervertebral disk (IVD) extrusion. The aim of the study was to evaluate blood degradation products and ferritin in the cerebrospinal fluid (CSF) of dogs with thoracolumbar IVD extrusion, and their association to clinical parameters and MRI findings.    Results  In the CSF of dogs with IVD extrusion, both net oxyhemoglobin absorption (NOA) and net bilirubin absorption (NBA) were significantly higher compared to the control groups of dogs with steroid responsive meningitis arteritis (SRMA) and idiopathic epilepsy (IE) ( P <  0.001), but NOA compared to the idiopathic epilepsy group contaminated artificially with blood (IEc) was not ( P =  0.890). Ferritin concentration was significantly higher in dogs with IVD extrusion compared to dogs with IE ( P =  0.034), but not to dogs with SRMA ( P =  0.526). There was no association between NOA, NBA or ferritin concentration and severity or duration of clinical signs. In dogs with a higher ferritin concentration the outcome was better ( P =  0.018). In dogs with evidence of hemorrhage on MRI, NOA and NBA were significantly higher ( P =  0.016,  P =  0.009), but not ferritin ( P =  0.0628).    Conclusion and clinical importance  Quantification of blood degradation products and ferritin in the CSF of dogs to assess subarachnoidal hemorrhage is feasible; however, larger case numbers are needed to evaluate the relevance of NBA and ferritin as prognostic indicators.

bmc veterinary research

Analysis of blood degradation products and ferritin in the cerebrospinal fluid of dogs with acute thoracolumbar intervertebral disk extrusion, a prospective pilot study