Myocardial infarct associated with a partial thickness left atrial tear in a dog with mitral insufficiency.
A 10-year-old male neutered cavalier King Charles Spaniel with a 1-year history of degenerative mitral valve disease presented for dyspnea and severe weakness. He was diagnosed with congestive heart failure, systolic dysfunction, presumptive myocardial infarction and a left atrial thrombus based on thoracic radiographs, electrocardiogram and echocardiographic findings. Clinical signs also suggested right foreleg embolism. The dog was euthanized due to the grave prognosis and a postmortem evaluation was performed. The postmortem examination confirmed myocardial infarction and was thought to be due to embolic showering from the thrombus attached to a partial thickness left atrial endocardial tear.
Section of Cardiology, Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Electronic address: margaretmsleeper@ufl.edu.
Meg M
MM
Sleeper
Section of Critical Care, Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
Meredith E
ME
Maczuzak
Section of Anatomic Pathology, Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
Susan J
SJ
Bender
D000818:Animals; D004283:Dog Diseases / Q000473:pathology*; D004285:Dogs; D006325:Heart Atria / Q000473:pathology*; D006331:Heart Diseases / Q000150:complications / Q000662:veterinary; D008297:Male; D008944:Mitral Valve Insufficiency / Q000662:veterinary*; D009203:Myocardial Infarction / Q000473:pathology / Q000662:veterinary*; D012421:Rupture / Q000473:pathology / Q000662:veterinary; D013927:Thrombosis / Q000150:complications / Q000662:veterinary
Congestive heart failure; Coronary artery occlusion; Endocardial splitting; Myocardial dyskinesis; Thromboembolism