Currently, Blalock-Thomas-Taussig shunts are not normally performed on infants with TOF except for severe variants such as TOF with pulmonary atresia ( pseudotruncus arteriosus ).
2.
Tetralogy of Fallot with pulmonary atresia ( " pseudotruncus arteriosus " ) is a severe variant in which there is complete obstruction ( atresia ) of the right ventricular outflow tract, causing an absence of the pulmonary trunk during embryonic development.
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