Peer-reviewed veterinary case report
How ameroid ring constrictors close liver shunts in dogs seen on CT
By Hunt, Geraldine B et al.·Published in Veterinary surgery : VS·2014·Department of Surgical and Radiological Sciences, United States·View original on PubMed →
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Original publication title: Evaluation of in vivo behavior of ameroid ring constrictors in dogs with congenital extrahepatic portosystemic shunts using computed tomography.
- Species:
- dog
Plain-English summary
A group of 22 dogs with congenital extrahepatic portosystemic shunts (abnormal blood vessels that bypass the liver) underwent a procedure using ameroid ring constrictors to help close these shunts. After the surgery, imaging showed that none of the constrictors completely closed the shunts, and some dogs still had residual blood flow. While most dogs did not show significant issues, one dog had persistent problems related to the shunt. Overall, the study suggests that the success of this treatment often relies on the body's response to the constrictor rather than the device itself.
People also search for: dog portosystemic shunt treatment · ameroid constrictor for dogs · congenital liver shunt in dogs
Abstract
OBJECTIVE: To evaluate the in vivo pattern of ameroid constrictor closure of congenital extrahepatic portosystemic shunts in dogs. STUDY DESIGN: Prospective study. ANIMALS: Dogs (n = 22) with congenital extrahepatic portosystemic shunts. METHODS: Contrast-enhanced computed tomography was performed immediately before, and at least 8 weeks after placement of ameroid ring constrictors. Plastic-encased ameroid constrictors were used in 17 dogs and metal constrictors in 5 dogs. Presence of residual flow through the portosystemic shunt, additional anomalous vessels, acquired shunts and soft tissue associated with the ameroid constrictor was recorded. Postoperative internal diameter was recorded for the 17 plastic constrictors. Correlations between internal diameter and pre- and postoperative serum protein concentration were analyzed. RESULTS: No ameroid constrictor closed completely: shunt occlusion was always dependent on soft tissue within the ameroid ring. Residual flow through the shunt was present in 4 dogs (18%), although this caused persistent elevation of shunt fraction in only 1 dog (dog 8). The change in ameroid constrictor internal diameter was not significantly correlated with serum protein concentration. CONCLUSIONS: Complete shunt occlusion after AC placement is usually dependent on soft tissue reaction. Ameroid constrictors ≥5 mm diameter may not promote complete shunt occlusion.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/24749629/