Surgical Management of Left‐Divisional Intrahepatic Portosystemic Shunts: Outcome After Partial Ligation of, or Ameroid Ring Constrictor Placement on, the Left Hepatic Vein in Twenty‐Eight Dogs (1995–2005)

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Abstract
Objectives—To evaluate outcome in dogs with left divisional intrahepatic portosystemic shunts (PSS) treated by partial ligation (PL) or ameroid ring constrictor (ARC) placement on the left hepatic vein.Design—Retrospective study.Animals—Dogs (n=28) with left divisional intrahepatic PSS.Methods—Retrieved data from medical records of dogs with left divisional intrahepatic PSS that had PL (n=17) or ARC (n=11) were signalment, history, clinical signs, preoperative blood work, portal pressure measurements, ARC size, complications and postoperative technetium scintigraphy. Outcome assessed by owner interview 6 months–10 years after surgery was classified as excellent, good or poor. Differences were tested by exact χ2test.Results—Major complications occurred in 3 dogs: coagulopathy (1 PL dog died), ascites (1 PL dog survived) and seizures (1 ARC dog died). Eight PL dogs had technetium portal scintigraphy; 1 dog was negative and 7 dogs positive for persistent shunting. Seven ARC dogs had scintigraphy; 4 dogs were negative and 3 positive for persistent shunting. In PL dogs, long‐term clinical outcome was excellent (92%) or good (8%) whereas, in ARC dogs it was excellent (20%), good (50%) or poor (30%). This outcome difference between treatment groups was significant (P=.0012).Conclusion—Dogs treated by PL had significantly better long‐term outcome compared with ARC treated dogs.Clinical Relevance—Based on these data, ARC placement on the left hepatic vein in dogs with left‐divisional intrahepatic PSS cannot be recommended.

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