The clinical signs can be life-threatening and are related to hepatic dysfunction, such as gastrointestinal disturbances and central nervous system derangements. Hepatic encephalopathy secondary to a single portosystemic shunt is a common clinical problem in small-breed dogs. Evaluation of ameroid ring constrictors for treatment for single extrahepatic portosystemic shunts in dogs: 168 cases (1995-2001). Although limited by the study's retrospective nature, the authors concluded that ameroid ring constrictors provided favorable results for dogs with a single portosystemic shunt. Predictive factors for excellent clinical outcome included a high preoperative albumin concentration, a low preoperative leukocytosis, low portal pressure after occlusion, and the absence of postoperative seizures and shunting. In dogs evaluated with scintigraphy six to 10 weeks after surgery, 21% had evidence of persistent shunting. Of the 86 dogs with excellent outcomes, 81 were normal without any medical treatment or a special diet. Ninety-four percent of the dogs had an excellent or good outcome after surgery. seizures, abdominal distention, hemoperitoneum, prolonged clotting) developed in 17 dogs (10%), and the morality rate was 7.1% (four of the 12 dogs that died had no complications). Of the 162 dogs in which the location of the shunt was recorded, 104 dogs (64%) had a portacaval shunt and 58 dogs (36%) had a portoazygous shunt. Thirty-one percent of the dogs were Yorkshire terriers. The dogs' median age at diagnosis was 12 months and median body weight was 8.6 lb (3.9 kg). The median follow-up period in this study was three years. An ameroid ring constrictor is placed around a portosystemic shunt, and the vessel is gradually occluded when the ameroid (a hygroscopic compressed casein that expands in fluid) expands within its stainless steel cylinder, fibrous tissue develops in response to the constrictor, and thrombosis occurs. In this retrospective study from two university teaching hospitals, the medical records of 168 dogs with a single portosystemic shunt treated with an ameroid ring constrictor were reviewed to evaluate morbidity and mortality.
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