Normal Electroretinogram in Domestic Shorthair Cats Using a Short Protocol of HMsERG

Abstract

This study aimed to determine normal electroretinogram (ERG) parameters in healthy domestic shorthair (DSH) cats. Normal ERG in seventeen DSH cats was recorded using the QuickRetCheck protocol, a very short method to assess retinal function, of the Handheld Multispecies eletroretinography (HMsERG). Scotopic ERGs were recorded in cats under tiletamine-zolazepam and isoflurane anesthesia. At low light intensity (10 mcd.s/m2) stimulation which determined the rod photoreceptor function, a-wave could not be detectable while the mean±standard error of b-wave amplitude and implicit time were 96.26 ± 5.98 μV and 64.66 ± 0.83 msec, respectively. At standard light intensity (3,000 mcd.s/m2), the mean a-wave amplitude and implicit time were 67.10 ± 4.08 μV and 16.20 ± 0.29 msec and the mean b-wave amplitude and implicit time were 413.38 ± 12.89 μV and 41.21 ± 0.95 msec, respectively. At high light intensity (10,000 mcd.s/m2) the mean a-wave amplitude and implicit time were 92.04 ± 5.03 μV and 15.49 ± 0.29 msec and the mean b-wave amplitude and implicit time were 444.34 ± 13.73 μV and 35.91 ± 0.94 msec, respectively. The b/a ratios of standard and high light intensity stimulation were 6.76 ± 0.39 and 5.09 ± 0.22, respectively. The present study successfully established normal ERG parameters in DSH cats