title: Per rectal portal scintigraphy in the diagnosis and management of feline congenital portosystemic shunts.
abstract: Five cats with a congenital portosystemic shunt (CPSS) were examined using transcolonic portal scintigraphy before and after surgical ligation of the shunting vessel. The mean shunt index before surgery was 52 per cent (range 45 to 61 per cent). Repeat portal scintigraphy, six to eight weeks after surgery, indicated a significant reduction in shunt index (mean 13 per cent, range 5 to 25 per cent) in four cats. In one of these cats a marked reduction in the shunt index, as determined by scintigraphy, preceded normal fasting blood ammonia. In the fifth cat there was no significant change in the shunt index, fasting serum bile acids and blood ammonia six months after surgery, although its clinical signs of hepatic encephalopathy had improved. Portal scintigraphy is useful in the diagnosis of CPSS and enables a quantitative assessment of the effects of surgery and may be a more accurate indicator of the degree of shunting after surgery than blood ammonia and serum bile acids.
authors.affiliation: Department of Small Animal Medicine and Surgery, Royal Veterinary College, University of London, North Mymms, Hatfield, Hertfordshire.
authors.forename: M A
authors.initials: MA
authors.lastname: Forster-van Hijfte
authors.forename: F J
authors.initials: FJ
authors.lastname: McEvoy
authors.forename: R N
authors.initials: RN
authors.lastname: White
authors.forename: C R
authors.initials: CR
authors.lastname: Lamb
authors.forename: H C
authors.initials: HC
authors.lastname: Rutgers
mesh_terms: D000641:Ammonia / Q000097:blood; D000818:Animals; D001647:Bile Acids and Salts / Q000097:blood; D002371:Cat Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging* / Q000601:surgery; D002415:Cats; D000013:Congenital Abnormalities / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000662:veterinary*; D005260:Female; D006501:Hepatic Encephalopathy / Q000097:blood / Q000503:physiopathology / Q000662:veterinary; D008297:Male; D011168:Portal System / Q000002:abnormalities* / Q000000981:diagnostic imaging* / Q000601:surgery; D011877:Radionuclide Imaging
chemical_list: D001647:Bile Acids and Salts; D000641:Ammonia