A 7-week-old male Doberman presented with tachypnea, dyspnea and a VI/VI, left cranial, continuous heart murmur. Thoracic radiographs revealed severe left-sided cardiomegaly, presence of a rounded soft tissue opacity in the caudodorsal aspect of the thoracic cavity and signs of left-sided congestive heart failure. Clinical signs of heart failure were medically controlled. Echocardiography and computed tomography demonstrated a left-to-right shunting patent ductus arteriosus (PDA) in combination with a right-to-left shunting pulmonary arteriovenous malformation (PAVM) between the right main pulmonary artery and the right caudal pulmonary vein. Arterial blood gasses revealed mild hypoxemia. Transcatheter occlusion of the PDA using an Amplatz Canine Duct Occluder was performed. Four months post-operatively, echocardiography showed normal cardiac size and function with complete PDA closure. Thoracic radiographs revealed absence of the rounded opacity and resolution of cardiomegaly and vascular congestion. The PAVM was no longer visualized on repeated computed tomography and the arterial blood gasses were within normal limits. A PAVM connecting a pulmonary artery to a pulmonary vein has only rarely been reported in dogs. This report describes the presence of a congenital PAVM in combination with a PDA in a dog, which has not been previously reported in veterinary medicine.

一只 7 周大的雄性杜宾犬出现呼吸急促、呼吸困难和 VI/VI、左颅、持续性心脏杂音。胸部X光片显示严重的左侧心脏肥大，胸腔尾背侧存在圆形软组织混浊，以及左侧充血性心力衰竭的体征。心力衰竭的临床症状得到药物控制。超声心动图和计算机断层扫描显示右主肺动脉和右尾肺静脉之间存在从左到右分流的动脉导管未闭（PDA）以及从右到左分流的肺动静脉畸形（PAVM）。动脉血气分析显示轻度低氧血症。使用 Amplatz 犬导管封堵器对 PDA 进行经导管封堵。术后四个月，超声心动图显示心脏大小和功能正常，PDA 完全闭合。胸部X光片显示没有圆形混浊，心脏扩大和血管充血消失。重复计算机断层扫描不再显示 PAVM，动脉血气也处于正常范围内。连接肺动脉和肺静脉的 PAVM 在狗身上的报道很少。该报告描述了狗体内存在先天性 PAVM 与 PDA 的结合，这在兽医学中从未有过报道。