Abstract
Shunt lesions in the septum separating the two atrial chambers are among the most common congenital heart malformations. It is in most cases associated with morbidity and mortality. A 12-year-old mixed-breed female canine was referred for a detailed examination due to symptoms, such as exercise intolerance and peritoneal fluid leakage. Echocardiographic examination revealed an atrial septal defect (ASD) of the ostium secundum type (left to right shunt). The patient lived for 8 months after the diagnosis. Upon performing the necropsy, a defect of 21 mm in diameter was detected in the atrial septum. Based on the location, an ostium secundum type atrial septal defect was diagnosed. The peculiarity of this case is that the patient lived for over 13 years, in an asymptomatic state, with a large atrial septal defect, relative to the animal’s size and weight.
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