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KMID : 0893420070080040409
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Journal of Veterinary Science
2007 Volume.8 No. 4 p.409 ~ p.414
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The determination of dark adaptation time using electroretinography in conscious Miniature Schnauzer dogs
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Yu Hyung-Ah
Jeong Man-Bok
Park Shin-Ae
Kim Won-Tae
Kim Se-Eun
Chae Je-Min
Yi Na-Young
Seo Kang-Moon
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Abstract
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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 cdㆍs/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 occured over the dark adaptation time. Moreover, at this time the mean amplitude was 60.30 ± 18.47 μV. 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 μV. 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.
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KEYWORD
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dark adaptation time, electroretinography, Miniature Schnauzer dogs
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