title: Use of transcolonic portal scintigraphy to monitor blood flow and progressive postoperative attenuation of partially ligated single extrahepatic portosystemic shunts in dogs.
abstract: Transcolonic portal scintigraphy was used to evaluate immediate and long-term changes in shunt blood flow after partial ligation of single extrahepatic portosystemic shunts in 8 dogs. Scintigraphy was performed before surgery, within the first 7 days after surgery, and 3 to 9 months after surgery. Shunt fraction values for this group of dogs before surgery ranged from 67 to 87% (normal reference range, < or = 15%). On the basis of postoperative scintigraphy, 4 dogs had immediate and lasting occlusion of shunt blood flow (shunt fraction, < or = 15%). One dog had a shunt fraction value within the reference range immediately after surgery, had evidence of recurrent shunt blood flow (shunt fraction, 23%) at 3 months after surgery, and again had a shunt fraction value within the reference range 9 months after surgery. Persistent, though reduced, shunt blood flow (shunt fractions, 23 and 27%) was evident immediately after surgery in 2 dogs. One of these dogs had a shunt fraction within the reference range 3 months after surgery, whereas shunt blood flow in the other dog had increased to 41%. One dog had no appreciable change in shunt blood flow immediately after surgery (shunt fraction, 70%), but the shunt fraction value had decreased to 41% at the time of the final scintigraphic examination. As assessed by transcolonic portal scintigraphy, partial single extrahepatic portosystemic ligation caused a significant decrease in mean shunt blood flow in this group of 8 dogs and resulted in eventual shunt occlusion in a majority of the dogs (6 of 8 dogs).(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Surgical Sciences, School of Veterinary Medicine, University of California, Davis 95616.
authors.forename: B J
authors.initials: BJ
authors.lastname: Van Vechten
authors.forename: J
authors.initials: J
authors.lastname: Komtebedde
authors.forename: P D
authors.initials: PD
authors.lastname: Koblik
mesh_terms: D000818:Animals; D000013:Congenital Abnormalities / Q000000981:diagnostic imaging / Q000601:surgery / Q000662:veterinary; D004283:Dog Diseases / Q000000981:diagnostic imaging* / Q000601:surgery*; D004285:Dogs; D005260:Female; D008026:Ligation / Q000662:veterinary; D008297:Male; D011168:Portal System / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D011182:Postoperative Care / Q000662:veterinary; D011300:Preoperative Care / Q000662:veterinary; D011877:Radionuclide Imaging; D012039:Regional Blood Flow