Article Text

Download PDFPDF
Hypernatraemia following surgery for a congenital extrahepatic portosystemic shunt in a Shih Tzu presenting with marked polyuria and polydipsia
  1. Valentina Andreoni1,
  2. Thurid Johnstone2 and
  3. Robert Furneaux3
  1. 1Animal Health Trust, Kentford, Newmarket, UK
  2. 2Faculty of Veterinary Agricultural Sciences, Translational Research and Animal Clinical Trial Study Group (TRACTS), U-Vet Animal Hospital, University of Melbourne Veterinary Clinic and Hospital, Werribee, Victoria, Australia
  3. 3Consultant Veterinary Surgeon, Robertson, New South Wales, Australia
  1. Correspondence to Valentina Andreoni; Valentina.Andreoni{at}


A 3-year-old male Shih Tzu was referred to the University Veterinary Hospital of the University College Dublin with a suspicion of congenital hepatopathy based on investigations performed by the referring veterinarian. Presenting signs were polyuria and polydipsia, vomiting, picky appetite and weight loss. Liver function test abnormalities and hyposthenuric urine were found during diagnostic work-up. Abdominal ultrasound identified an extrahepatic portosystemic shunt, which was temporarily occluded using a Rummel tourniquet and then completely ligated with nylon. Recovery was smooth and uneventful. Behavioural activity was considered normal until the next day when the dog developed tonic–clonic seizures. Clinicopathological assessment revealed hypernatraemia as the potential cause of the seizures. Despite intensive care, the patient died. Post-mortem findings were consistent with cerebral oedema and acute cerebrocortical necrosis.

  • extra hepatic portosystemic shunt
  • hypernatraemia
  • dogs
  • Seizures
View Full Text

Statistics from


  • Contributors VA: data collection, critical analysis of the events and writing the manuscript. TJ and RWF: supervision during the data collection and critical review of the paper.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data availability statement No data are available.

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.