Author(s): Palumbo, Mariana Isa Poci ; Resende, Luiz Antonio de Lima [UNESP] ; Olivo, Giovane [UNESP] ; de Oliveira-Filho, José Paes [UNESP] ; Borges, Alexandre Secorun [UNESP]
Date: 2022
Persistent ID: http://hdl.handle.net/11449/229948
Origin: Oasisbr
Subject(s): Equine; Flash Stimuli; Latencies; Sedation; Visual System
Made available in DSpace on 2022-04-29T08:36:46Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-01-01
The visual evoked potential (VEP) has many applications in veterinary neurology, but the test is not routinely used in a clinical setting. The aim of this study was to describe a reliable method for recording flash visual evoked potentials (F-VEPs) in nonsedated horses. F-VEPs were recorded from both eyes in 20 healthy and calm, adult horses. Recordings were accomplished without sedation, anaesthesia, or the use of mydriatic drugs. The mean and standard deviation of the latency of the most evident positive peak was 52.76±2.37 ms (P53). The mean latencies of the preceding and following negative peaks were 38.14±4.62 (N38) and 72.35±5.33 ms (N72), respectively. There were 2 mean peak-to-peak amplitudes (N38 – P53 and P53 – N72), and they were 11.85±6.21 and 22.81±11.50 µV, respectively. F-VEP was also recorded from 3 horses (6 eyes) before and during sedation with 2 doses each of xylazine (0.4 and 1.1 mg/kg) or detomidine (0.005 and 0.014 mg/kg). It was possible to obtain a reliable F-VEP with a P53 latency in horses without sedation that was similar to the P2 peak described in previous studies, and these data can be used in the future as a normal reference for comparisons in horses with different diseases using a similar methodology. Sedation affected the results by depressing peak amplitudes and increasing latencies or by completely obscuring any response. The exact impact of sedation on VEPs must be evaluated with much caution due to the small sample size.
Faculdade de Medicina Veterinária e Zootecnia Universidade Federal de Mato Grosso do Sul
Department of Neurology Psychology and Psychiatry College of Medicine - Univ Estadual Paulista (UNESP) Botucatu
Department of Veterinary Clinical Science College of Veterinary Medicine and Animal Science - Univ Estadual Paulista (UNESP), Botucatu
Department of Neurology Psychology and Psychiatry College of Medicine - Univ Estadual Paulista (UNESP) Botucatu
Department of Veterinary Clinical Science College of Veterinary Medicine and Animal Science - Univ Estadual Paulista (UNESP), Botucatu
