Normal values of b-wave responses of full-field electroretinogram in Lhasa Apso dogs with cataracts according to age

• Main Authors: Ana C.A. Góes, Tatiane Villar, Denise A. Otsuki, Ricardo Lisak, Ricardo A. Pecora, Angélica M.V. Safatle
• Format: Article
• Language: English
• Published: Colégio Brasileiro de Patologia Animal (CBPA) 2015-03-01
• Series: Pesquisa Veterinária Brasileira
• Subjects: Eletrorretinograma; catarata; caninos; LhasaApso.
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-736X2015000300274&lng=en&tlng=en

Lhasa Apso dogs with immature, mature or hypermature cataracts were divided into four groups according to their age (G1: 1 to 3 years old, G2: 4 to 7 years old, G3: 8 to 11 years old, G4: more than 12 years old). All animals were evaluated under the same sedation protocol to allow the performance of the electroretinogram (ERG) exam to determine normal value of b-wave response of the full-field ERG according to age. Three ERG responses were recorded: rod, maximal and cone responses. The amplitude values and b-wave implicit time of the responses of all groups were compared and analyzed by Kruskal-Wallis test (variance analysis for non-repeated measures), followed by the Dunn post-test (when p<0,05). A significant decrease was observed in maximal responses' amplitude, when comparing the G4 group with G1 and G2. No statistically relevant differences were observed in the b-wave implicit time values between groups. The ERG values are directly influenced by the animal's age. Older patients presented a decrease in the amplitude of the maximal response. The study determined the normal parameters of ERG b-waves for Lhasa Apso dogs with cataract according to their age group.