Evaluation of in vivo behavior of ameroid ring constrictors in dogs with congenital extrahepatic portosystemic shunts using computed tomography

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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 ≥5mm diameter may not promote complete shunt occlusion.

Original languageEnglish (US)
Pages (from-to)834-842
Number of pages9
JournalVeterinary Surgery
Volume43
Issue number7
DOIs
StatePublished - Oct 1 2014

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Surgical Portasystemic Shunt
computed tomography
Tomography
Dogs
dogs
blood proteins
Plastics
plastics
Blood Proteins
ameroid
prospective studies
experimental design
metals
Metals
Prospective Studies

ASJC Scopus subject areas

  • veterinary(all)

Cite this

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title = "Evaluation of in vivo behavior of ameroid ring constrictors in dogs with congenital extrahepatic portosystemic shunts using computed tomography",
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 ≥5mm diameter may not promote complete shunt occlusion.",
author = "Hunt, {Geraldine B} and Culp, {William T} and Mayhew, {Kelli N.} and Philipp Mayhew and Steffey, {Michele A} and Allison Zwingenberger",
year = "2014",
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T1 - Evaluation of in vivo behavior of ameroid ring constrictors in dogs with congenital extrahepatic portosystemic shunts using computed tomography

AU - Hunt, Geraldine B

AU - Culp, William T

AU - Mayhew, Kelli N.

AU - Mayhew, Philipp

AU - Steffey, Michele A

AU - Zwingenberger, Allison

PY - 2014/10/1

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N2 - 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 ≥5mm diameter may not promote complete shunt occlusion.

AB - 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 ≥5mm diameter may not promote complete shunt occlusion.

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