Dogs with congenital portosystemic shunt (PSS) are typically diagnosed before 2 years of age. The objective of this study was to determine if miniature schnauzers are more likely to be diagnosed with congenital PSS at an older age than are other breeds. This retrospective study examined the case records of 171 dogs diagnosed with congenital PSS; dogs were included if they were definitively diagnosed as having congenital PSS by nuclear scintigraphy, contrast portography, and/or exploratory surgery. Seven (23%) of 31 miniature schnauzers diagnosed with congenital PSS were 7 years of age or older at the time of diagnosis, compared to 3.4% for all other breeds. Miniature schnauzers had a relative prevalence ratio of 6.3 (95% confidence interval 2.2 to 18.6; P=0.001) for being diagnosed at or after 7 years of age when compared to all other breeds of dogs. Clinical signs of congenital PSS may not manifest sufficiently to cause an owner to seek veterinary care for some dogs until they are older. Congenital PSS should be considered in mature dogs, particularly miniature schnauzers, that are presented with signs potentially consistent with hepatic encephalopathy.
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July/August 2010
CLINICAL PATHOLOGY|
July 01 2010
Diagnosis of Congenital Portosystemic Shunt in Miniature Schnauzers 7 Years of Age or Older (1997–2006)
Michelle Mertens, DVM;
Michelle Mertens, DVM
Departments of Small Animal Clinical Sciences (Mertens, Fossum, Willard, de la Paz, Miller) and Veterinary Integrative Biosciences (Fosgate), College of Veterinary Medicine, Texas A&M University, College Station, Texas 77843
Faculty of Veterinary Medicine (Farmer), University of Glasgow, 464 Bearsden Road, Glasgow, Scotland, United Kingdom G61 1QH
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Theresa W. Fossum, DVM, PhD, Diplomate ACVS;
Theresa W. Fossum, DVM, PhD, Diplomate ACVS
Departments of Small Animal Clinical Sciences (Mertens, Fossum, Willard, de la Paz, Miller) and Veterinary Integrative Biosciences (Fosgate), College of Veterinary Medicine, Texas A&M University, College Station, Texas 77843
Faculty of Veterinary Medicine (Farmer), University of Glasgow, 464 Bearsden Road, Glasgow, Scotland, United Kingdom G61 1QH
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Michael D. Willard, DVM, MS, Diplomate ACVIM;
Michael D. Willard, DVM, MS, Diplomate ACVIM
Departments of Small Animal Clinical Sciences (Mertens, Fossum, Willard, de la Paz, Miller) and Veterinary Integrative Biosciences (Fosgate), College of Veterinary Medicine, Texas A&M University, College Station, Texas 77843
Faculty of Veterinary Medicine (Farmer), University of Glasgow, 464 Bearsden Road, Glasgow, Scotland, United Kingdom G61 1QH
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Geoffrey T. Fosgate, DVM, PhD, Diplomate ACVPM;
Geoffrey T. Fosgate, DVM, PhD, Diplomate ACVPM
Departments of Small Animal Clinical Sciences (Mertens, Fossum, Willard, de la Paz, Miller) and Veterinary Integrative Biosciences (Fosgate), College of Veterinary Medicine, Texas A&M University, College Station, Texas 77843
Faculty of Veterinary Medicine (Farmer), University of Glasgow, 464 Bearsden Road, Glasgow, Scotland, United Kingdom G61 1QH
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Angel Garcia de la Paz, DVM;
Angel Garcia de la Paz, DVM
Departments of Small Animal Clinical Sciences (Mertens, Fossum, Willard, de la Paz, Miller) and Veterinary Integrative Biosciences (Fosgate), College of Veterinary Medicine, Texas A&M University, College Station, Texas 77843
Faculty of Veterinary Medicine (Farmer), University of Glasgow, 464 Bearsden Road, Glasgow, Scotland, United Kingdom G61 1QH
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Ryan Farmer, BS, MS;
Ryan Farmer, BS, MS
Departments of Small Animal Clinical Sciences (Mertens, Fossum, Willard, de la Paz, Miller) and Veterinary Integrative Biosciences (Fosgate), College of Veterinary Medicine, Texas A&M University, College Station, Texas 77843
Faculty of Veterinary Medicine (Farmer), University of Glasgow, 464 Bearsden Road, Glasgow, Scotland, United Kingdom G61 1QH
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Matthew W. Miller, DVM, MS, Diplomate ACVIM
Matthew W. Miller, DVM, MS, Diplomate ACVIM
Departments of Small Animal Clinical Sciences (Mertens, Fossum, Willard, de la Paz, Miller) and Veterinary Integrative Biosciences (Fosgate), College of Veterinary Medicine, Texas A&M University, College Station, Texas 77843
Faculty of Veterinary Medicine (Farmer), University of Glasgow, 464 Bearsden Road, Glasgow, Scotland, United Kingdom G61 1QH
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J Am Anim Hosp Assoc (2010) 46 (4): 235–240.
Citation
Michelle Mertens, Theresa W. Fossum, Michael D. Willard, Geoffrey T. Fosgate, Angel Garcia de la Paz, Ryan Farmer, Matthew W. Miller; Diagnosis of Congenital Portosystemic Shunt in Miniature Schnauzers 7 Years of Age or Older (1997–2006). J Am Anim Hosp Assoc 1 July 2010; 46 (4): 235–240. doi: https://doi.org/10.5326/0460235
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