It is the third most common cyanotic congenital great defect and is the most common cause of cyanosis with left ventricular hypertrophy.
Tricuspid atresia can be divided into two types:
*Tricuspid atresia with normally related great arteries
*Tricuspid atresia with transportation of the great arteries
The most common type of tricuspid atresia, muscular variety is characterized by a dimple or a localized fibrous thickening in the floor of the right atrium.
In tricuspid atresia, blood cannot flow from the right atrium to the right ventricle; therefore, pulmonary blood flow is greatly reduced and dependent on other shunts.
The right ventricle generally is hypoplastic and inflow portion of the right ventricle is missing.
The clinical features of tricuspid atresias are dependent on the degree of pulmonary stenosis present. Most commonly, neonates will have significant pulmonary stenosis or even pulmonary atresia.
Tricuspid atresia
