Fossa ovalis tear causing right to left shunting in a Cavalier King Charles Spaniel

Geri A. Lake-Bakaar, Mai Yee Mok, Mark D Kittleson

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Left atrial tear is an infrequent sequela of severe mitral regurgitation due to myxomatous mitral valve degeneration. Interatrial septal tear due to mitral regurgitation causing a left-to-right shunt is uncommon. Right to left shunting secondary to acute interatrial septal tear is very rarely reported in the human literature, and has not been reported in the veterinary literature in a dog. This case describes the clinical, radiographic, echocardiographic, gross pathologic, and histopathologic features of a dog presented in acute respiratory distress secondary to acute onset right to left shunting through the interatrial septum. This was later documented to be due to a tear in the septum secondary to tricuspid regurgitation and pulmonary hypertension. The presence of an acquired right to left shunting atrial septal defect is of clinical and prognostic significance, and should be considered in cases of acute respiratory distress.

Original languageEnglish (US)
Pages (from-to)541-545
Number of pages5
JournalJournal of Veterinary Cardiology
Issue number4
StatePublished - Dec 2012


  • Atrial septal defect
  • Fossa ovalis
  • Pulmonary hypertension

ASJC Scopus subject areas

  • veterinary(all)
  • Physiology


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