Electroretinography in dogs using a fiber electrode prototype

Abstract

We compared two electroretinography (ERG) electrodes in dogs using ERG standards of the International Society for Clinical Electrophysiology of Vision (ISCEV). Ten healthy Yorkshire terrier dogs (mean age, 2.80 ± 1.42 years; 6 females) weighing 5.20 ± 1.56 kg were evaluated using an ERG system for veterinary use. Dark- and light-adapted ERG responses were recorded using an ERG-Jet electrode and a fiber electrode prototype. The examinations were performed during 2 visits, 3 weeks apart. Both electrodes (ERG-Jet or fiber prototype) were used on each animal and the first eye to be recorded (OD × OS) was selected randomly. Three weeks later the examination was repeated on the same animal switching the type of electrode to be used that day and the first eye to be examined. The magnitude and waveform quality obtained with the two electrode types were similar for all ERG responses. ERG amplitudes and implicit times obtained from dogs using the fiber electrode prototype were comparable to those obtained with the ERG-Jet electrode for rod, maximal rod-cone summed, cone, and 30-Hz flicker responses. The fiber electrode prototype is a low-cost device, available as an alternative instrument for clinical veterinary ERG recording for retinal function assessment.

Comparison of two sedation protocols for short electroretinography in cats

“…Hence, sedation or general anesthesia is strongly recommended. [9][10][11] Several anesthetic protocols, including thiopentone and propofol; 12 halothane or isoflurane, or sevoflurane with or without nitrous oxide; 13 ketamine combined with xylazine or medetomidine hydrochloride; 11,14,15 and tiletamine/zolazepam 16 have been used for ERG in dogs; and isoflurane, 4 ketamine combined with xylazine, 7,[17][18][19] and pentobarbital 3 has been used in cats. As anesthetics may affect the ERG in a dose-dependent manner, 5 several studies have been performed in order to elucidate the effects of various anesthetics on the retina of dogs but not of cats.…”

Avaliação eletrorretinográfica pré e pós-operatória em cães diabéticos submetidos à facoemulsificação

“…Ao comparar os eletrodos, podemos observar que as respostas dos testes eletrofisiológicos diferem entre si (GUM, 1980;DANTAS, 1995;KUZE;UJI, 2000;ITOH et al, 2013;PEREIRA et al, 2013).…”

“…As características de condutibilidade dos eletrodos também podem influenciar nas respostas obtidas (HÉRBERT et al, 1996;MAHEHARA et al, 2005;MENTZER et al, 2005;BELLER et al, 2007;PEREIRA et al, 2013;ITOH et al, 2013 Dentre as desvantagens do eletrodo Burian Allen podemos citar o custo, a dificuldade em obtê-lo e a variedade de tamanhos necessárias para as diversas raças de cães analisadas no estudo.…”