truncus arteriosus

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A congenital heart defect characterized by a single arterial trunk arising in the ventricle, which supplies the pulmonary, coronary, and systemic circulation; a large VSD always accompanies TAs, essentially converting the right and left ventricles into a single chamber; blood flows at a higher pressure through the arteries–the pressure in the pulmonary circulation is normally low; systemic pressure in the pulmonary circulation blood flow through the lungs, cardiac load, heart failure; pulmonary pressure eventually damages the pulmonary vessels, causing pulmonary resistance, ergo pulmonary blood flow and cyanosis Clinical SOB, fatigue, heart failure, poor growth, physical development and, untreated, death at a young age.

 

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