Padronização de valores presumidamente normais para ultrassonografia ocular de cutias (Dasyprocta prymnolopha Wagler, 1831) e catetos (Tayassu tajacu Linnaeus, 1758).

Abstract

The objective of this study was to perform the ocular echobiometry and measure the Doppler velocimetric indices of the ophthalmic external artery in agouti (Dasyprocta prymnolopha) and collared peccaries (Tayassu tajacu). In addition, a case of cataract diagnosed with the aid of ultrasound in an agouti was reported. The transpalpebral technique was used to perform the ultrasound exams. The echobometry of the agoutis (Chapter I) obtained the values of anterior chamber thickness (D1), crystalline thickness (D2), vitreous chamber thickness (D3) and axial length. ocular bulb (D4), then the external ophthalmic artery flow was identified to obtain the resistivity index (IR). The data obtained in the evaluations were submitted to statistical analysis, adopting 5% of significance. Based on the methodology used, the following values were obtained for the right and left ocular globe, respectively: D1 - 1.28 ± 0.3 mm and 1.22 ± 0.1 mm; D2 - 8.27 ± 0.9 mm and 8.11 ± 0.9 mm; D3 - 5.35 ± 0.48 mm and 5.30 ± 0.47 mm and D4 - 12.7 ± 0.9 mm and 13 ± 0.68 mm. The mean IR values were 0.4305 ± 0.0390 and 0.4258 ± 0.0387 (right and left eye, respectively), characterizing a low resistance. For the collared peccaries, the obtained values were (right and left eyeball, respectively): D1- 1.72 ± 0.29 mm and 1.76 ± 0.40 mm; D2 - 9.95 ± 1.08 mm and 10.6 ± 0.99 mm; D3 - 7.42 ± 0.93 mm and 7.45 ± 0.72 mm; and D4 - 17.6 ± 0.78 mm and 17.8 ± 0.59 mm. The IR values were 0.435 ± 0.02 and 0.448 ± 0.02. There was no statistical difference between the right and left ocular globe in any of the parameters studied in the mentioned species previously. Ultrasound examination in B mode was also used to characterize the ocular globe of an agouti, which presented isolation, difficulty of ambulation and bilateral opacity in the ocular globe. During the examination, it was possible to observe an increase in the bilateral intralenticular echogenicity with posterior lens reinforcement, without additional alterations. Based on the sonographic characteristics, it was possible to conclude that the animal presented bilateral cataract, and the technique for the diagnosis adopted was efficient and reliable for the diagnosis. The use of B-mode ultrasonography and color Doppler allowed the characterization of the anatomical components of the eye, the measurement of ocular structures, the characterization of the cataract and the hemodynamic study of the flow of the ophthalmic artery in all animals, allowing a comparison between the antimeres. The data inferred here are presumed normal and serve as a reference for the species studied, and can be applied in the ophthalmologic routine, assisting in the staging of lesions, as well as serving as a reference to establish appropriate therapeutic protocols.