Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: The normal electroretinogram in adult healthy Shih Tzu dogs using the HMsERG | J. Vet. Sci. 2009 10 3 233-238 DOI JOURNAL OF Veterinary Science The normal electroretinogram in adult healthy Shih Tzu dogs using the HMsERG 1 1 1 1 2 1 June-sub Lee Kyung-hee Kim Ha-young Jang Bora Lee Joon Young Kim Soon-wuk Jeong Department of Veterinary Surgery College of Veterinary Medicine Konkuk University Seoul 143-701 Korea 2Department of Veterinary Medicine Madingley Road Cambridge CB3 0ES United Kingdom Electroretinography ERG is a reliable diagnostic tool for the diagnosis of retinal disease. It measures electric potentials occurring in the retina in response to light stimulation. In this study we examined the normal electroretinogram using the Handheld Multispecies ERG HMsERG in Shih Tzu dogs. ERG recordings were performed in twelve eyes of six healthy Shih Tzu dogs. Dogs were anesthetized with a combination of medetomidine and ketamine. Proparacaine eye drops were also applied as a topical anesthetic. Tropicamide eye drops were applied for mydriasis. After 20 min of dark adaptation we recorded the amplitudes and implicit times of the b-waves of the rod standard rod and cone Std R C high-intensity rod and cone Hi-int R C and cone systems and responses of the cones and inner retina by flicker light stimulation cone flicker . Results showed that mean the amplitudes of a-waves of Std R C Hi-int R C and the cone responses were p V p V and p V respectively. The b-waves of the rod responses ranged from to pV the Std R C was pV the Hi-int R C was p V the cones were p V and the flicker responses were p V. The b a ratios for the Std R C Hi-int R C and the cone response were and respectively. Mean implicit time of the a-wave of the Std R C was ms of Hi-int R C was ms and of the cone response was ms. The b-wave of the rod responses ranged from to ms of Std R C were ms of Hi-int R C were of the cone responses were ms
