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Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: The determination of dark adaptation time using electroretinography in conscious Miniature Schnauzer dogs | J. Vet. Sci. 2007 8 4 409-414 JOURNAL OF Veterinary Science The determination of dark adaptation time using electroretinography in conscious Miniature Schnauzer dogs Hyung-Ah Yu Man-Bok Jeong Shin-Ae Park Won-Tae Kim Se-Eun Kim Je-Min Chae Na-Young Yi Kang-Moon Seo Department of Veterinary Surgery and Ophthalmology College of Veterinary Medicine and BK21 Program for Veterinary Science Seoul National University Seoul 151-742 Korea The optimal dark adaptation time of electroretinograms ERG s performed on conscious dogs were determined using a commercially available ERG unit with a contact lens electrode and a built-in light source LED-electrode . The ERG recordings were performed on nine healthy Miniature Schnauzer dogs. The bilateral ERG s at seven different dark adaptation times at an intensity of 2.5 cd s m2 was performed. Signal averaging 4 flashes of light stimuli was adopted to reduce electrophysiologic noise. As the dark adaptation time increased a significant increase in the mean a-wave amplitudes was observed in comparison to base-line levels up to 10 min p 0.05 . Thereafter no significant differences in amplitude oc-cured over the dark adaptation time. Moreover at this time the mean amplitude was 60.30 18.47 gV. However no significant changes were observed for the implicit times of the a-wave. The implicit times and amplitude of the b-wave increased significantly up to 20 min of dark adaptation p 0.05 . Beyond this time the mean b-wave amplitudes was 132.92 17.79 gV. The results of the present study demonstrate that the optimal dark adaptation time when performing ERG s should be at least 20 min in conscious Miniature Schnauzer dogs. Key words dark adaptation time electroretinography Miniature Schnauzer dogs Introduction The electroretinogram ERG is a test which measures the electrical potential generated by the retina of the eye when it is stimulated by light 40 . An important indication for ERG recordings in dogs is the The first and second author .
