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Outflow Tract Obstructions in Animals


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 System
A 10-year-old, male-castrated golden retriever has a 1-month history of mild lethargy and decreased appetite. On physical examination, he has pale mucous membranes and weak femoral pulses. His complete blood count (CBC) shows a decreased packed cell volume (PCV), decreased mean corpuscular volume (MCV), and decreased mean corpuscular hemoglobin concentration (MCHC). His biochemistry panel shows a mildly increased blood urea nitrogen (BUN) level and mildly increased serum alkaline phosphatase (ALP) level. Which of the following is the most likely cause of this dog’s anemia? 
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