A slowly progressive retinopathy in the Shetland Sheepdog
| Autor: | Richard R. Dubielzig, Eva Hertil, Caroline J. Zeiss, Ernst Otto Ropstad, Ellen Bjerkås, Björn Ekesten, Lena Karlstam |
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| Rok vydání: | 2011 |
| Předmět: |
Progressive retinal atrophy
medicine.medical_specialty genetic structures General Veterinary medicine.diagnostic_test 040301 veterinary sciences business.industry 04 agricultural and veterinary sciences Degeneration (medical) Fundus (eye) medicine.disease Attenuated vessels 0403 veterinary science Ophthalmoscopy 03 medical and health sciences 0302 clinical medicine medicine.anatomical_structure Shetland Sheepdog Ophthalmology 030221 ophthalmology & optometry Medicine sense organs business Outer nuclear layer Retinopathy |
| Zdroj: | Veterinary Ophthalmology. 14:227-238 |
| ISSN: | 1463-5216 |
| DOI: | 10.1111/j.1463-5224.2010.00866.x |
| Popis: | Objective To describe a slowly progressive retinopathy (SPR) in Shetland Sheepdogs. Animals Forty adult Shetlands Sheepdogs with ophthalmoscopic signs of SPR and six normal Shetland Sheepdogs were included in the study. Procedure Ophthalmic examination including slit-lamp biomicroscopy and ophthalmoscopy was performed in all dogs. Electroretinograms and obstacle course-test were performed in 13 affected and 6 normal dogs. The SPR dogs were subdivided into two groups according to their dark-adapted b-wave amplitudes. SPR1-dogs had ophthalmoscopic signs of SPR, but normal dark-adapted b-wave amplitudes. Dogs with both ophthalmoscopic signs and subnormal, dark-adapted b-wave amplitudes were assigned to group SPR2. Eyes from two SPR2 dogs were obtained for microscopic examination. Results The ophthalmoscopic changes included bilateral, symmetrical, greyish discoloration in the peripheral tapetal fundus with normal or marginally attenuated vessels. Repeated examination showed that the ophthalmoscopic changes slowly spread across the central parts of the tapetal fundus, but did not progress to obvious neuroretinal thinning presenting as tapetal hyper-reflectivity. The dogs did not appear seriously visually impaired. SPR2 showed significantly reduced b-wave amplitudes throughout dark-adaptation. Microscopy showed thinning of the outer nuclear layer and abnormal appearance of rod and cone outer segments. Testing for the progressive rod–cone degeneration ( prcd )-mutation in three dogs with SPR was negative. Conclusion Slowly progressive retinopathy is a generalized rod–cone degeneration that on ophthalmoscopy looks similar to early stages of progressive retinal atrophy. The ophthalmoscopic findings are slowly progressive without tapetal hyper-reflectivity. Visual impairment is not obvious and the electroretinogram is more subtly altered than in progressive retinal atrophy. The etiology remains unclear. SPR is not caused by the prcd-mutation. |
| Databáze: | OpenAIRE |
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