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  • Author or Editor: Agnes J. Delauche x
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To establish normal predictive values for cord dorsum potential (CDP) onset latency after thoracic and pelvic limb sensory or mixed nerve stimulation in adult dogs.


26 clinically normal adult dogs.


Sensory nerve action potentials (SNAP) were recorded proximally from tibial and lateral superficial radial nerves after distal stimulation. The CDP were recorded from the L4-L5 interarcuate ligament for the tibial nerve and from the C7-T1 interarcuate ligament for the radial nerve. Linear regression analyses were performed for CDP onset latency, and mean ± SD was calculated for CDP onset to peak latency differences and sensory nerve conduction velocities (SNCV).


For the tibial nerve, expected CDP onset latency (CDPOL) = −1.194 + 0.014 × pelvic limb length (mm; R 2 = 0.912); CDPOL = −2.156 + 0.011 × pelvic limb/spinal length (mm; R 2 = 0.911); and CDPOL = 0.941 + 2.197 × tibial nerve SNAP latency (milliseconds; R 2 = 0.903). For the radial nerve, CDPOL = −0.9 + 0.014 × thoracic limb length (mm; R 2 = 0.873); and CDPOL = 1.454 + 1.874 × radial nerve SNAP latency (milliseconds; R 2 = 0.903). Mean ± SD for CDP onset to peak latency difference for tibial and radial nerves was 3.1 ± 0.3 and 3.0 ± 0.4 milliseconds, respectively.


Strong linear associations exist between CDPOL and a number of easily measured peripheral independent variables in dogs. There is also a narrow range of normal values for CDP onset to peak latency differences that is independent of limb length.

Clinical Relevance

CDP evaluation can be used to accurately assess functional severity and distribution of abnormalities in proximal sensory nerves, dorsal nerve roots, and spinal cord dorsal horns in dogs with suspected neuropathy, radiculopathy, or myelopathy involving the brachial or lumbosacral intumescences. (Am J Vet Res 1999;60:222-226)

Free access
in American Journal of Veterinary Research


Objective—To determine results of magnetic resonance (MR) imaging in dogs with vestibular disorders (VD) and correlate results of MR imaging with clinical findings.

Design—Retrospective study.

Animals—85 dogs.

Procedure—Information on signalment, clinical signs, and presumptive lesion location was obtained from the medical records, and MR images were reviewed.

Results—27 dogs had peripheral VD, 37 had central VD, and 21 had paradoxical VD. Of the 27 dogs with peripheral VD, 11 (41%) had MR imaging abnormalities involving the ipsilateral tympanic bulla compatible with otitis media (6 also had abnormalities involving the petrous portion of the ipsilateral temporal bone compatible with otitis interna), 7 (26%) had MR imaging abnormalities compatible with middle ear neoplasia, 2 (7%) had an ipsilateral cerebellopontine angle lesion, and 7 (26%) did not have MR imaging abnormalities. All dogs with central and paradoxical VD had abnormalities evident on MR images. Of the 37 dogs with central VD, 13 (35%) had an extra-axial lesion, 6 (16%) had an intra-axial lesion, and 18 (49%) had multiple intra-axial lesions. In 23 (62%) dogs with central VD, lesions on MR images corresponded with location suspected on the basis of clinical signs. Of the 21 dogs with paradoxical VD, 12 (57%) had an extra-axial lesion, 5 (24%) had an intra-axial lesion, and 4 (19%) had multiple intra-axial lesions. Location of lesions on MR images agreed with location suspected on the basis of clinical signs in 19 (90%) dogs.

Conclusions and Clinical Relevance—Results suggest that MR imaging may be helpful in the diagnosis and treatment of VD in dogs. (J Am Vet Med Assoc 2001;218:385–391)

Full access
in Journal of the American Veterinary Medical Association