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Mechanical quantitative sensory testing in cavalier King Charles spaniels with and without syringomyelia
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Mechanical quantitative sensory testing in cavalier King Charles spaniels with and without syringomyelia
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Journal Article
Mechanical quantitative sensory testing in cavalier King Charles spaniels with and without syringomyelia
2020
Overview
Background
Syringomyelia (SM) is a debilitating condition in the cavalier King Charles spaniel (CKCS) that results in neuropathic pain and diminished quality of life. Von Frey aesthesiometry (VFA) is a method of mechanical quantitative sensory testing that provides an objective sensory threshold (ST) value and can be used to quantify neuropathic pain (NP) and monitor response to therapy. The utility of VFA has been previously established in client-owned dogs with acute spinal cord injury but the technique has not been evaluated in dogs with SM. The goal of this study was to evaluate ST, as determined by VFA, in dogs with and without SM, to assess the utility of VFA in quantifying NP in SM-affected dogs. We hypothesized the SM-affected CKCS would have lower ST values, consistent with hyperesthesia, when compared to control CKCS. Additionally, we hypothesized that ST values in SM-affected dogs would be inversely correlated with syrinx size on MRI and with owner-derived clinical sign scores.
Results
ST values for the thoracic and pelvic limbs differed significantly between the SM-affected and control CKCS (
p
= 0.027;
p
= 0.0396 respectively). Median ST value (range) for the thoracic limbs was 184.1 g (120.9–552) for control dogs, and 139.9 g (52.6–250.9) for SM-affected dogs. The median ST value (range) for the pelvic limbs was 164.9 g (100.8–260.3) in control dogs and 129.8 g (57.95–168.4) in SM-affected dogs. The ST values in SM-affected dogs did not correlate with syrinx height on MRI (
r
= 0.314;
p
= 0.137). Owner-reported clinical sign scores showed an inverse correlation with pelvic limb ST values, where dogs with lower ST values (hyperesthesia) were reported by their owners to display more frequent and severe clinical signs (
r
= − 0.657;
p
= 0.022).
Conclusion
ST values were lower in SM-affected CKCS compared to control dogs, suggesting the presence of neuropathic pain. Dogs with lower ST pelvic limb values were perceived by their owners to have more severe clinical signs classically associated with SM. Our results suggest that VFA might offer quantitative assessment of neuropathic pain in SM-affected dogs and could be useful for monitoring response to therapy in future clinical studies.
Publisher
BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
