USO DE ANEL CONSTRITOR AMERÓIDE PARA CORREÇÃO DE UM SHUNT PORTOSSISTÊMICO CONGÊNITO EXTRA-HEPÁTICO PORTO ÁZIGOS: RELATO DE CASO

Abstract

Congenital extrahepatic portosystemic shunts are vascular anomalies that divert blood from the portal vein directly into the systemic circulation, compromising liver function. This condition results in the liver's failure to metabolize toxins such as ammonia, which can trigger hepatic encephalopathy, especially in small breed dogs. The aim of this study was to report a clinical case of a congenital extrahepatic portosystemic shunt in a dog, looking at the diagnosis and surgical correction using an ameroid constrictor ring. This was a seven-month old male dog of no defined breed, who presented with neurological signs compatible with hepatic encephalopathy. Complementary imaging and laboratory tests were carried out, which led to the diagnosis of a single portoazygos shunt. The animal underwent clinical stabilization and then surgery to implant an ameroid ring in the anomalous vessel, promoting gradual occlusion of the shunt. The post-operative period included nutritional support, hepatoprotectants, a liver diet and laboratory and imaging monitoring. The results were satisfactory, with progressive clinical improvement. It is concluded that the use of the ameroid constrictor ring is a safe and effective alternative for the definitive treatment of extrahepatic congenital portosystemic shunts, promoting functional restoration of the liver and improvement of the neurological condition. Early diagnosis, combined with a multidisciplinary approach, is essential for therapeutic success and a favorable prognosis.