Visual evoked potentials in the clinically normal dog.
Visual evoked potentials (VEP) in response to flashes of white light were recorded from 15 adult beagles of both sexes to provide a normative data base. Separate recordings were taken by stimulating each eye of every dog. Responses were recorded from a needle electrode placed over the nuchal crest referenced to an electrode just caudal to the eyes. Five positive and negative peaks were present in each VEP; P1, N1, P2, N2, and P3. Peak P2 was the most prominent. Mean (+/- standard deviation [SD]) latencies for peaks P1, N1, P2, N2, and P3 were 14.3 +/- 2.4, 29.2 +/- 2.2, 54.5 +/- 7.4, 78.0 +/- 13.1, and 98.1 +/- 12.6 msec, respectively. Peak-to-peak mean amplitudes ranged from 5.88 to 13.30 microV. Recordings were accomplished without sedation, anesthesia, or mydriatic drugs.
Strain
G M
GM
Department of Veterinary Physiology, Pharmacology, and Toxicology, School of Veterinary Medicine, Louisiana State University, Baton Rouge 70803-8420.
Jackson
R M
RM
Tedford
B L
BL
D000818:Animals; D004285:Dogs / Q000502:physiology*; D004566:Electrodes / Q000662:veterinary; D004596:Electroretinography / Q000662:veterinary; D005074:Evoked Potentials, Visual; D005260:Female; D008297:Male; D015203:Reproducibility of Results