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Right-to-Left Shunts (Cyanotic Heart Disease) in Animals

By

Sandra P. Tou

, DVM, DACVIM, North Carolina State University

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

Right-to-left shunts include Tetralogy of Fallot and truncus arteriosus.

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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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