Among the congenital cardiac alterations observed in small pets, the persistence of the right aortic arch has been described as a rare anomaly in cats. The ductus arteriosus corresponds to a normal fetal vascular structure derived from the distal portion of the sixth left aortic arch that connects the pulmonary artery to the dorsal aorta. During fetal life, this structure has the function of transporting oxygenated blood from the maternal placenta to the aorta, bypassing the collapsed lungs of the fetus. At birth, the increase of O2 partial pressure dissolved in arterial blood (PaO2) and the decline in prostaglandin concentration cause the closure of the ductus arteriosus in the first hours of life, giving rise to the ligamentum arteriosus. If this process does not occur, the ductus arteriosus will remain patent. In this case report, a 4-month-old longhair female kitten was treated, and, during auscultation, a heart murmur was found. After performing a Doppler echocardiogram and color flow mapping, the presence of continuous turbulent flow in the pulmonary artery was demonstrated, characteristic of patent ductus arteriosus persistence. The animal was sent for surgery, and in the post-surgical Doppler echocardiogram, correction of patent ductus arteriosus was verified, demonstrating the absence of continuous turbulent flow in the pulmonary artery.
cat disease, congenital heart disease, heart disease, persistent right aortic arch, diagnostic imaging