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Outflow Tract Obstructions in Animals

By

Sandra P. Tou

, DVM, DACVIM, North Carolina State University

Last full review/revision Jan 2020 | Content last modified Jan 2020

Outflow tract obstructions are congenital cardiac defects that include aortic stenosis, pulmonic stenosis, and coarctation of the aorta. All involve obstruction to either right or left ventricular outflow. Defects such as double chamber right ventricle, branch pulmonary artery stenosis, and cor triatriatum also create obstruction to normal blood flow but are not located within the right ventricular or left ventricular outflow tracts.

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Circulatory
In all animals, congenital heart defects can cause abnormal shunting of blood. Left-to-right shunts cause blood to be recirculated through the pulmonary vessels and can result in chamber dilatation. Right-to-left shunts cause blood to bypass the pulmonary vessels and can cause cyanosis. Which of the following conditions is most likely to result in a right-to-left heart shunt?
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