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Updated: Jan 23, 2026

Comprehensive Endovascular and Open Surgical Management of Cerebral Arteriovenous Malformations
Published on: October 20, 2017
Coronary arteriovenous malformation in a dog with a complex arrhythmia and hypothyroidism
R R Blake1, M Longo2, G Santarelli1
1Cardiopulmonary Service, Hospital for Small Animals, Royal (Dick) School of Veterinary Studies & The Roslin Institute, The University of Edinburgh, Roslin, Midlothian, EH25 9RG, UK.
Abstract:
A four-year-old Japanese Akita was referred for investigation of lethargy, exercise intolerance, and an irregular heart rhythm. He was diagnosed with atrial fibrillation, a complex ventricular arrhythmia, and hypothyroidism. Echocardiography identified a nest of anomalous vessels surrounding the heart and shunting into the pulmonary artery. Computed tomography confirmed a coronary arteriovenous malformation consisting of a coronary-to-pulmonary arterial communication and an associated complex nest of tortuous vessels, which was thought to be an incidental finding. Clinical signs improved with levothyroxine and antiarrhythmic treatment. Describing an unusual coronary artery anomaly as well, this case serves as a reminder to critically evaluate the hemodynamic significance of structural cardiac disease and to screen for systemic disease in patients with arrhythmias.
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