A cat previously diagnosed with valvular aortic stenosis developed acute respiratory distress. A new continuous heart murmur was noted on physical exam. Echocardiographic examination revealed vegetative lesions on the aortic valve and continuously shunting blood flow from the aorta into the left atrium. Despite initial treatment for left-sided congestive heart failure, the cat died suddenly. In addition to confirming aortic valve endocarditis and an acquired aorto-left atrial shunt, pathological examination identified vegetative lesions on the luminal surface of the ascending aorta. Although antemortem aerobic blood culture, 16s bacterial ribosomal DNA PCR, and Bartonella PCR failed to identify causative organisms, Escherichia coli was identified on postmortem tissue culture of the aortic lesion. This represented a unique case of primary valvular aortic stenosis with secondary infective aortic endocarditis, infective aortic endarteritis, and aorto-left atrial fistula in a cat. It highlighted potential adverse outcomes of aortic stenosis that are more commonly recognized in humans and dogs.

一只先前被诊断出患有主动脉瓣狭窄的猫出现了急性呼吸窘迫。体格检查发现新的持续性心脏杂音。超声心动图检查显示主动脉瓣有植物性病变，血流不断从主动脉分流至左心房。尽管对左侧充血性心力衰竭进行了初步治疗，但这只猫还是突然死亡。除了确认主动脉瓣心内膜炎和获得性主动脉左心房分流外，病理检查还发现了升主动脉腔表面的植物性病变。虽然生前有氧血培养、16s细菌核糖体DNA PCR和巴尔通体PCR未能鉴定致病微生物，但大肠杆菌在主动脉病变的死后组织培养中发现。这代表了猫原发性主动脉瓣狭窄伴继发感染性主动脉心内膜炎、感染性主动脉内膜炎和主动脉左心房瘘的独特病例。它强调了在人类和狗中更常见的主动脉瓣狭窄的潜在不良后果。