Case 11 — Diagnosis

Based on the signalment, history, physical examination, radiographs, and echocardiographic studies, you should now be able to make a primary diagnosis and a reason for this dog’s defect in its atrial septum. You should also be able to make a diagnosis of the arrhythmia. Take the quiz below. Once you have completed this, you will have access to follow-up information (including therapy) that will give you additional information about this dog and its condition.