André Rodrigues da Cunha Barreto Vianna

Hemogasometria venosa de equinos finalistas de provas de enduro de 90 km

Front of exercise, the organic systems may suffer water-electrolyte and acid-base imbalances, particularly in the case of blood gases, demonstrating variations from different causes, whether respiratory and/or metabolic. Understanding the physiological adaptations to exercise is essential in the search for the optimum performance. In this way, this study measured the venous blood gases (pO2, pCO2), as well as the oxygen saturation (SatO2) in healthy equines, Arabian horses finalists in 90km endurance races. A total of fourteen Arabian horses were evaluated, nine males and five females, between six and 12 years old, finalists in 90km endurance races. There was a significant reduction in pO2, pCO2 and SatO2 after the exercise, however, the values remained within the normality range, and did not change the athletic performance of the animals, indicating a temporary alteration, assuming thus a character of physiological response to the exercise performed. The equines, finalists in 90 Km endurance races, demonstrated efficient ventilatory process, without any alterations in the athletic performance, being adapted to the type of exercise imposed.

Quantificação de tecido conjuntivo do músculo cardíaco em equinos de tração através de técnicas histoquímicas e morfométricas

ABSTRACT Cardiomyocytes are sustained and inserted into aconnective tissue skeleton that has different distributiondepending up on the properties of the region in which it stands.The purpose of this study was to quantify the proportion ofconnective tissue in relation to the arrangement ofcardiomyocytes of left and right ventricles and interventricularseptum in myocardium of six mixed breed, ill trifted adulthorses, of both sexes, used for traction. With hearts still freshand with the aid of a digital caliper, it was estimated the heightof left ventricle, the heart’s width, the heart’s circumferenceand the thickness of the ventricular free walls and interventricularseptum. The fragments on the middle third of the interventricularseptum and free walls of the ventricles were subjected toconventional histological technique. The blocks were cut withthickness of 5 μ m and stained with Picrosirius Red, GomoriTrichrome and Azan Trichrome to show the connectivetissue. The slides were analyzed using optical microscopecoupled to a digital analysis program Image-Pro Plus®. Theaverage proportion of connective tissue in the left ventricle was6.1+3.7%, in the interventricular septum and it was observed amean of 6.8+3.6%. In the right ventricle the average was6.0+3.0%. Applying the H test of Kruskal-Wallis, it was foundthat there was statistical difference between the different dyesused for each region. In the Pearson correlation test it was notfound pattern correlation between the thickness of the regionsanalyzed and the proportion of connective tissue

Sistematização da origem, da distribuição e dos territórios da artéria cerebral caudal na superfície do encéfalo em gatos

In this study were used 26 brains of adult cats, without sex differentiation and definable race, colored with latex and fixed in formaldehyde aqueous solution. The right and left caudal cerebral arteries were single in 96.1% and 88.4% of the sample, respectively. In 69.2% of the samples on the right side and 80.8% on the left, the caudal cerebral artery fin from the anastomosis behind the caudal branch of the internal carotid artery, with a large contribution, and the basal artery terminal branch. In 88.4% of the samples on the right side and 84.6% on the left, the caudal cerebral artery showed the tectal rostral artery and one caudal branche. The caudal branch forked in two branches that supplied the rostral and caudal colliculis of the quadruplet bodies and formed the choroid plexus of the third ventricle. The tectal rostral artery followed ventrally to the piriform lobe and during his way sent some branches to hippocampus. In the left side, this vessel supplied the dorsal surface of thalamus and contributed to the formation of the choroid plexus of the third ventricle.